T3 Or Not T3 – Exploring The Controversy

I don’t want that synthetic stuff; I want the natural thyroid hormone.

This is probably one of the most misguided requests I get in my practice.  To make sure we’re all on the same page here, I’m talking about levothyroxine vs dessicated (pig/cow) thyroid.  First, I must reject the premise of the patient’s italicized statement above. 

Levothyroxine is Natural; Pig Thyroid Isn’t

What?!  Every other blog I’ve read says the exact opposite!

That’s because none of what you’ve read has been written by an endocrinologist (or at least not an endocrinologist worth her salt).  Among endocrinologists, it’s an open secret that levothyroxine is one of the most natural forms of hormone replacement for the human body.  When your thyroid is underactive, and your doctor puts you on a levothyroxine pill, the body cannot tell the difference between levothyroxine and thyroxine (the native hormone).  In other words, your body is perfectly happy to use levothyroxine just as it was using thyroxine when your thyroid was healthy.

Pig thyroid pills, on the other hand, contain a mixture of T4 and T3, in a ratio of roughly 4:1, respectively.  That’s a wonderful cocktail – if you’re a hypothyroid pig.  Guess what the ratio of T4:T3 is in the human body – about 15:1!  So when you take pig thyroid, you’re getting way more T3 than what the human body is accustomed to seeing on a daily basis.  Not good.  I’ll explain why shortly.

So we’ve got levothyroxine – a “synthesized” hormone that is identical to the thyroxine that your thyroid would be making if it was functioning properly.  And then we have pig thyroid, which gives you both T4 and T3 (two for the price of one!), but in a ratio that is way out of proportion for the human body.  Which of these sounds more natural so far?

Well, I’d rather get too much T3 than not enough.  After all, if my thyroid isn’t working, doesn’t that mean that I’m not making enough T4 and T3?  I have to take at least some T3, right?

You’re still skeptical – I get it.  You’ve read that T3 is the “active” form of thyroid hormone that gets inside the cells and gets the job done.  The thing is, the body is efficient at taking levothyroxine (T4) and converting it into T3.  All the different tissues in the body (liver, kidneys, muscles, brain, etc) are going to make however much T3 they need.  Are there instances in which various tissues don’t make as much T3 as they need?  Yes, but this is nowhere near as common as some of the non-evidence-based information out there would have you believe.  And when it does occur, the magnitude of the impact is probably not as vast as one might think.  If you really want to geek out on the T3 conversion issue, read Guidelines for the Treatment of Hypothyroidism: Prepared by the American Thyroid Association Task Force on Thyroid Hormone Replacement, and jump to:

13a. Do genetic variants in thyroid hormone pathway genes (deiodinases or thyroid hormone transporters) affect the serum or tissue levels of thyroid hormones in healthy euthyroid individuals or hypothyroid patients taking replacement therapy?


■  Summary statement

Specific polymorphisms in the deiodinases are consistently associated with very small changes in serum thyroid hormone levels. Insufficient data exist to draw any conclusion about the clinically relevant effects of deiodinase or transporter polymorphisms on tissue thyroid hormone levels.


If you like, there’s a plethora of scientific text you can wade through after the summary statement, but I think the more relevant issue to dive into is, why do some people feel better with pig thyroid or when we add liothyronine (T3) to their levothyroxine therapy?  And the corollary: if people like pig thyroid, why is your doctor loathe to prescribe it for you?

Five Types of People Who May Need/Like T3

  1. If someone does have one of those (not clinically diagnosable) deiodinase polymorphisms, it is certainly possible that T3 therapy provides replacement for a physiologic need.  In this case, levothyroxine alone might not cut it.
  2. Patients who have had their thyroids removed have to rely entirely on T4 to T3 conversion for their T3 needs.  In other words, an absent thyroid can’t make any T3 at all, so patients with postsurgical hypothyroidism occasionally feel better with combination T4/T3 therapy.  Contrast this to the typical patient with an under-functioning thyroid (primary hypothyroidism), who probably makes enough T3 such that exogenous (supplemental) T3 won’t make a difference.
  3. Hypothyroid patients with depression may benefit from the addition of T3 to their levothyroxine.
  4. Anyone particularly susceptible to the placebo effect will like T3.  Frankly, this encompasses almost everyone – it is rare to be immune from the placebo effect.
  5. I saved the best for last, because I believe that this is the most common reason why people like T3.  T3 is a short-acting hormone that – especially when given in supra-physiologic doses (like pig thyroid!) – tends to act as a stimulant.  This is actually true of lots of hormones when taken in higher than physiologic doses.  Ever take a whopping dose of prednisone for a few days and feel like Superman?  Do you know any body builders who juice and feel fantastic for three days after an injection of 1000mg (venti-sized dose!) of testosterone?  So, just because someone feels good on T3 does not mean that she is deficient in that hormone.  Smoking crack probably feels pretty good, but you’d never assume the addict has a “crack deficiency.”

Your Doctor isn’t Mean – She Just Cares about Your Long-Term Health

When exposed to high levels of T3, the body may exhibit symptoms of thyrotoxicosis (too much thyroid hormone).  Symptoms like heart palpitations, tremors, sweating, anxiety, and insomnia may occur even if the TSH is within the normal range.  Remember, while the TSH is usually highly accurate, if you spend part of the day with high T3 levels and part of the day with low levels, that may average out to a normal TSH.  In this case, a normal TSH does not mean you are normal. 

After longer periods of time, the heart may go into a dangerous rhythm called atrial fibrillation, the bones may become more fragile and prone to fracture, and muscles may waste.  So, while your doctor would love to fix all your symptoms right away, a stimulant that masks whatever is really going on with you is probably not the best long-term solution.

OK, I’m hearing all this, but can’t we just check a T3 level in my blood and use that to gauge whether I need T3 therapy?

Oh, were it that simple…the T3 level in your blood does not correlate well with the T3 level in all your various tissues.  Remember, each organ is making its own T3 based on its needs at that moment.  We can’t measure that.  On top of that, when on levothyroxine therapy, the blood level of T3 is usually low-normal and sometimes even slightly low.  But there has been no evidence showing that these levels correlate with any symptoms.  Bottom line: it is not helpful to check T3 levels in hypothyroid patients on levothyroxine, in an attempt to determine whether T3 therapy is indicated.

How to Broach the Subject of T3 Therapy with Your Doctor

After all that, you’re going to advise me how to actually get my doctor to prescribe T3 for me?  Did I misread the first 2/3 of this post?

No, you didn’t misread me.  After years of offering small doses of liothyronine to a subset of patients on levothyroxine – in a physiologic ratio of T4:T3 – I am disappointed with T3 therapy and skeptical that it has much benefit.  However, I do have a minority of patients who have tried T3 and have had a durable response to it.  I say “durable” because patients will often have an immediate benefit from the stimulant effect, which then wanes over the course of weeks to months.  If someone still feels better six months after starting T3, I consider that a durable response.  So, if a patient meets all of the following criteria, I may offer a trial of T3 therapy:

  • The TSH is already in the lower half of the normal range.  Sometimes (not all the time), hypothyroid symptoms will improve just by bumping the levothyroxine dose a bit to push the TSH down below 2 – 2.5.
  • There is no competing diagnosis to explain the “hypothyroid” symptoms.  For example, if a patient has sleep apnea and isn’t treating it because she doesn’t like the CPAP mask, T3 is not yet on the table.
  • The patient does not have active heart problems (angina, atrial fibrillation, etc.).
  • The patient does not have moderate-severe anxiety.  In my experience, T3 makes this worse.

If you feel you meet the above criteria, then consider broaching the subject with your doctor.  But you must understand and embrace the following bullet points before you ask:

  • If you do try T3, keep your expectations low.  Remember, you may feel better when you start it, but that feeling may disappear if the benefit was solely due to the stimulant effect.
  • If your doctor went through medical school and residency/fellowship in the 1990’s or after, chances are she has been taught that T3 is unhelpful at best, evil at worst.
  • T3 therapy is often associated with naturopathy; the naturopathic approach to hormone treatments is way out in left field and mostly antithetical to the allopathic (mainstream medicine) approach.  The number of people I’ve taken care of who have been misdiagnosed and mistreated by naturopaths should be horrifying to the lay public.  More on this in future posts.
  • Before prescribing T3, your doctor may want to probe aspects of your health and lifestyle that you feel are irrelevant to your symptoms.  I recommend you listen to your doctor, as it is impossible to be objective when it comes to your own health.  You may “know your body,” but your doctor knows hundreds – if not thousands – of bodies just like yours.  I know it’s disheartening to read that you’re not that special, but trust me, you’re not.

If you’re still reading by this point, I assume that you remain interested in discussing T3 therapy with your doctor.  Here’s how I would initiate the conversation:

Doc, I’ve been on levothyroxine for quite some time now, and I still have several symptoms that just won’t resolve, like [symptoms].  I realize that my TSH is optimized, which should mean that the treatment of my hypothyroidism is optimized.  So I’ve been thinking about what else could be causing my symptoms, and I just can’t come up with anything.  I’m getting at least 7-8 hours of sleep every night, I’m eating clean, and I exercise several times per week [this better be true].  Based on what you know about me, can you suggest any other avenues to explore that might help me figure out these symptoms?

Now you pause.  Let your doctor earn her $20 copay ($40 if she’s an endocrinologist).  Give her time to ask you questions, look at your lab work from the past couple of years, and see if perhaps there is something else to explore.  If she has some suggestions, great.  If she agrees that you are otherwise healthy, it is possible that she may actually broach the idea of a trial of T3 (this is much more likely if you have a mid-late career Endocrinologist).  If she comes up empty and basically shrugs her shoulders, then you can carefully and respectfully bring up the possibility of a trial of T3:

Doc, don’t worry about being out of ideas.  I’ve been wracking my brain for [weeks/months/years] and I haven’t come up with any competing diagnoses either.  So I wanted to get your opinion about something I read.  It was written by an endocrinologist, so I hope it’s more trustworthy than the majority of the nonsense out there on the internet.  It seems like there is a small subset of hypothyroid patients who will benefit from adding in a small dose of liothyronine to their levothyroxine.  I understand that, when used, the levothyroxine dose should remain somewhere around 10-20 times as much as the liothyronine dose, to keep the ratio close to normal for human physiology.  I also understand that it may not work, and I’m ok with that.  If it doesn’t work, then I’m happy to stop it.  What do you think?

You’ve done several things by couching your request as above.  You’ve communicated that you and your doctor are on the same team, and you’ve acknowledged that you don’t expect miracles.  You have implied that you understand how doctors feel about internet research and that you understand the limitations of such research.  You have asked your doctor to give her opinion of what you’ve read, thereby demonstrating that you respect her education and experience, and you value the doctor/patient relationship.  Now the ball is in her court.  She can agree to a trial or not.  If not, you can try to gauge if there is any wiggle room in that “no.”  But if there isn’t, you need to accept that and either forget the trial of T3, or go get a second opinion.

What do you think?  Have you tried liothyronine or talked to your doctor about it?  What has your experience been with your trial or with your doctor?  Are you a doctor who has used T3 for your patients?  Do you think it has value?  Comment below!

By interacting with me in the Comments, you agree that you have read and will abide by my Disclaimer.

88 Replies to “T3 Or Not T3 – Exploring The Controversy”

  1. Excellent, informative and entertaining summary of thyroid hormone replacement and the intricacies of T3T4. I especially like the sample script at the end. It is so important to be prepared when you meet with your doctor. This article has you more than prepared.

    1. Thanks, Dr. Scher. If people are going to ask for T3, I hope that they will do so from a position of knowledge and have realistic expectations.

  2. Thank you for the article, but you haven’t addressed why I take T3, which is as an anti-depressant adjutant. My understanding is that the level of evidence is for T3 as an anti-depressant is not great, that the mechanism of action is not understood, but that it is routinely tried in cases of recalcitrant depression, and that the evidence is clear that T4 is not helpful in these cases.

    I’m also concerned about long term T3 use in these circumstances. I’ve yet to find anything relevant on this. And periodically my doctor orders a full thyroid panel which always comes back abnormal, but is apparently “normally abnormal.”

    Also my hair fell out once, but that has not been repeated, and the dermatologist did a thyroid and told me that if it had been my thyroid, that the problem had gone away.

    1. Thanks for the comment, Christine. In my post, I do mention (in the section about who might benefit from T3) that patients with hypothyroidism and depression sometimes benefit from the addition of T3 to their T4 therapy. You don’t say whether you take T3 for hypothyroidism/depression, or just for depression. In the absence of hypothyroidism, T3 is not considered a standard pharmacologic therapy for depression. Of course, I don’t know your medical history and would not presume to make any recommendations in this venue, so I’d defer to your treating clinician.

      As for long-term use of T3, high doses over long periods of time can be irritating to the heart, muscles, and bones, among other organ systems. Low doses of T3 are much less likely to cause any long-term problems.

      1. although t3 is not a standard treatment for depression, there are a number of classic [old] papers on using it as an adjunct to antidepressants in refractory cases. these days, with so many more agents available and well-proven to be effective [both antidepressants and proven adjuncts] it is more rare that such an approach would be taken. and sometimes it does work. there is no evidence to my knowledge, btw, that t3 is better in this use than t4. i was discussing bipolar disorder with an NIMH researcher who mentioned t3 and i asked him if he had any basis to prefer it to t4, and he did not.

        HOWEVER, this brings up the possibility of patients who are mildly hypothyroid but who have “normal” thyroid studies. 4.4% of NORMAL people will have studies outside of 2 sigmas, and presumably there must be individuals whose numbers look normal but aren’t optimal for those individuals. in some individuals who have refractory depression, and who have tsh in the upper half of the range, i’ve tried adding t4 [not t3] to drive their tsh down toward 1 or so. sometimes they feel much better.

        1. I think it’s reasonable to try levothyroxine for someone with uncontrolled depression and a high-normal TSH, especially if they have positive thyroid (TPO) antibodies. As long as we’re not suppressing the TSH, there is little harm in a 6-month trial.

  3. I’m so glad to find this blog, being an endo patient myself. Before I got acquainted with skepticism, Quackwatch, etc., I fell for the T4/T3 idea, when after a thyroidectomy it took ages to feel OK again and all the “pro” patients in the forums were suggesting T3 supplementation or even dessicated thyroid. I couldn’t go to a naturopath, as there were none available in my country, so my only loss was an expensive reverse T3 lab test. Now that my skeptic muscle is trained better, I’m glad I didn’t go further with it, I’d probably get diagnosed with adrenal fatigue or Lyme, or some other imaginary disease.

    I do have a question – I was prescribed a selenium supplement to help with T4/T3 peripheral conversion (by a regular endo). Back then I must have a difficult patient with preconceived ideas about my problems, tired, depressed and anxious on top of it, so I can imagine the endo giving a placebo, but it seems it’s not entirely without scientific base. So what exactly is the evidence level for selenium supplementation in patients after thyroid removal?

    1. Great question, BL, and thanks for the kind words. The evidence for selenium improving T4 to T3 peripheral conversion in a clinically meaningful way (i.e. you will actually feel a difference) is poor.

      In my practice, I occasionally prescribe selenium for two reasons:

      – To reduce the risk of postpartum thyroiditis in a woman with a history of autoimmune thyroiditis (a woman with positive thyroperoxidase antibodies).

      – To improve symptoms in mild to moderate thyroid eye disease in a patient with Graves’-associated orbitopathy.

      Other than those situations, there isn’t much of a role for selenium, at least according to currrent evidence. Selenium does, interestingly, lower TPO antibody levels in patients with high titers; however, it has not been shown to decrease the need for thyroid hormone therapy in these patients. So it doesn’t seem to make much sense to use it just to lower the antibody level if it isn’t going to do anything tangible.

      In a thyroidectomized person, I’m not aware of any evidence that selenium is helpful.

      1. Thanks!
        One more thing about the dessicated thyroid – I always wondered about thyroid cancer patients using it so happily – shouldn’t they be worried about causing fluctuating thyroglobulin marker values? Wouldn’t you miss a recurence with this “natural” approach? Back when I read these suggestions in patient forums, this seemed to be quite a scary consequence.

        1. Another great point, BL. In theory, dessicated thyroid is even less ideal for a patient with a history of thyroid cancer (thyroid surgically removed) than it is for a patient with garden variety, primary hypothyroidism (thyroid that is underactive).

          Because most patients take dessicated thyroid once daily, and because there is so much short-acting T3 in there, they spend the first part of the day with high levels of T3, and the second part of the day with low levels. Because there is less long-acting T4 in that preparation of thyroid hormone, then there is less consistent suppression of TSH, which could (in theory), lead to more stimulation of residual thyroid cancer growth by TSH (Thyroid Stimulating Hormone). This would show up as a rising thyroglobulin level, as you suggested.

          This is all theory, as I am unaware of any data that proves patients on dessicated thyroid hormone have higher rates of thyroid cancer recurrence. But if I had thyroid cancer and a medium-high risk of recurrence based on the ATA risk stratification system, I would not take the risk of using dessicated thyroid hormone for my long-term thyroid replacement.

    2. Tell my cousin who just spent 6 weeks in rehab as a result of Lyme disease it imaginary. Better yet tell my client his 17 year old son died from an imaginary disease after Lyme spirochetes attacked his heart and he literally dropped dead. Ps my dog recently died from anaplasmosis another imaginary tick disease. You are arrogant and ignorant.
      Yours Truley
      from NY Hudson Valley.

  4. Very interesting article. Love it. I went to a functional medicine doctor who was also a western medicine doctor prior to switching. She left me on my levothyroxine 75mcg but I also take liothyronine 5mcg daily for 5 months with no side affects. My hair loss is less on the combo. I’m 61 and I,m curious with any long term affects of this mixture. Can you comment? I would love to hear from you. Thanks

    1. Thanks for the kind words, Debbie. Functional medicine is an interesting field, as it is dominated by quacks in my area, but has the potential to be holistic in a good way if done right. As an aside, if you want to see what functional medicine can/should be, check out Dr. Bret Scher’s site. I will actually be posting my review of his book tonight (note that he and I have no financial relationship, but he is a friend).

      Regarding your thyroid question: for most people on 75mcg of levothyroxine, 5mcg of liothyronine would be considered a pretty reasonable dose. The only comment I have is that liothyronine peaks at 2-4 hours after ingestion and then wanes, such that it is best dosed twice daily if someone wants exposure to the medication throughout more of the day. Unfortunately, 5mcg is the smallest pill available, and when I ask people to split it to 2.5mcg twice a day, they usually report that it just crumbles to dust. I think some generic versions are better than others in that respect, though I don’t know which ones split nicer. Many people feel fine with just the morning hit of 5mcg, though, so if someone notices a clinical improvement on T3 that is durable, I am ok with once daily dosing.

      As for long-term ill effects, it would be unlikely to see higher rates of bone loss and heart arrhythmias with such a small dose of T3. Although there isn’t much data in this area, I wouldn’t worry much about people who take small, physiologic doses of T3. I would worry a lot more about people taking whopping doses of T3 who consistently have suppressed TSHs.

      1. Wow that was great. I was on 5mcg of the livo in the morning and then in the afternoon but more hair loss so we discontinued the afternoon dose. I will try splitting to see what happens to my pill they are quite small. I’ll check out your friend info also. Thanks.

        I also asked about compounded hormone replacement vs Premarin any opinions or references on that. Estiodiol is what I am curious about and what about progesterone? I have no ovaries or uterus since 2001. Just curious.

      2. As T3 is only clinically available in 5 or 25μg, what might you consider a ‘whopping’ dose? The only solution for dosage variants are compounding pharmacies.

  5. Way back in the mid 1960s I was diagnosed as hypothyroid and put on Levothyroxin. A few years later, while living in Europe, my prescription was changed to Cytomel (T3) at lowest available dose to treat chronically low BMR. I stayed on that treatment for almost 30 years. With age either my need for T3 declined or my conversion of T4 to T3 improved or reverse T3 (never measured) improved or? Anyway I started getting too high for T3 and after some delay discontinued the medication, but not until after I had developed AFib. Have now been off any thyroid med for 20 years with quite normal health, and the Afib controlled with meds. Seems like T3 can be beneficial for quite long periods, but needs to be discontinued immediately if things change.

    1. T3 should be considered an adjunct to levothyroxine replacement, at most. It is not a replacement for T4 therapy. I agree that it should be stopped in certain situations, especially if the dose of T3 is substantial.

  6. I’ve been taking WP Thyroid, natural T4/T3 combo, for at least 2 years now. Now I’m thinking I made a mistake asking for it. (At the least, I think it makes me anxious.) I’ve been taking only 1/4 grain equivalent per day, though. Hopefully I haven’t harmed myself? Ugh. (I have Hashimoto’s, with TPO between 300 & 380 for the last few years.) Thank you for this site!

  7. I was diagnosed with mild Hashimoto’s in 2009-10. I’ve had a couple of hyperthyroid episodes – eating twice my usual amount and still losing weight fast, not able to fall asleep until 7 AM, etc., etc..
    The weird thing is, both of these episodes happened when I started taking a small amount of liothyronine (T3) in addition to the levothyroxine. I didn’t change my dose of levothyroxine. But each time I started taking liothyronine, I had a hyperthyroid episode.
    I stopped both the T3 and T4 when I started having hyperthyroid symptoms.
    But, my hyperthyroid symptoms continued for maybe 4-5 days anyway. They gradually tapered off, and I resumed the levothyroxine but not the liothyronine.
    Since T3 is short-acting, it seems weird that it would trigger a prolonged hyperthyroid episode. Maybe it somehow triggered my thyroid into dumping a lot of thyroid hormone into my blood? Have you ever noticed this happening or know why it might happen?

    1. It’s not unusual to feel thyrotoxic after being on too much thyroid hormone, even for a few days after stopping the T3. T3 would not cause the thyroid to release more hormone, but it’s certainly possible to take too much exogenous thyroid hormone.

      1. It seems weird that a small dose of liothyronine added in (probably it was 5 mg/day), would put my body into a wildly abnormal state for days after stopping it.
        I got some thyroid values measured in one of those episodes – I had stopped taking T3 and T4 and I was calming down – my TSH was about zero, and my free T3 was > 11 pg/mL.

      2. ps Maybe adding liothyronine can set off a vicious circle because it makes the thyroid more active so it pumps out more thyroid hormone …

        1. I can’t comment on your specific situation, but I can say this:

          – liothyronine would not cause the thyroid to pump out additional hormone.

          – when I see someone with a very low TSH and very high T3/T4 levels, it usually means that they are massively over-replaced with exogenous thyroid hormone or they are actually hyperthyroid.

          – it is important to distinguish between hyperthyroidism, which is the overproduction of thyroid hormone by the thyroid; and thyrotoxicosis, which is the presence of too much thyroid hormone from any cause. Thyrotoxicosis can be due to taking too much exogenous thyroid hormone or due to the thyroid cranking out too much thyroid hormone.

  8. My aging mother was doing poorly pn T4-only medication for her hypothyroidism. I advocated for her FreeT3 to be tested by her assisted living facility’s visiting physician and it was found to be low. She was given T3, and now she’s feeling better, has more energy, and is no longer sleeping 16 hours a day.

    I am on combination NDT treatment and Unithroid (T4). This combination is fantastic for me. I have been on it for now 8 years.
    Two of my three children, also (sadly) hypothyroid, are also on a combo of NDT plus Unithroid. All are doing well and my eldest sailed through college and grad school on NDT. At the age of 12, she was so depressed she could not carry out her obligations (homework, musical instrument practice). She was overweight, had no energy, her beautiful thick curly hair was falling out and breaking, she had plantar fasciitis, and had terrible well-being. NDT reversed all that. None of us but my mother began our treatment with T4-only, so apart from my mother, I can’t speak to having seen a first-hand difference. However, I’m a part of aj online forum of over 60,000 Hashimotos patients, and I can tell you with no hint of indecision that the vast majority of those in the forum have had their lives turned around by the addition of T3. Infertile women and those with no children due to multiple miscarriages have been able to bear children, even. Perhaps the fact that you haven’t seen much longterm benefit in your practice from the use of T3 is that you may not have been trained properly in its use. Surely such training is not widely available in medical schools, and is kept out of physician conferences because the conferences are underwritten by the maker of Synthroid. (And this company is also a large donor to medical schools.)

    Here is a compilation of various studies on the topic:
    While this is not the forum which asked me to serve as moderator, and I’m not fond of the angry tone of the website, the anger arises from doctors who keep their patients functionally hypothyroid with poor treatment, causijmng continued suffering and so I understand it.

    The tone of your own article is haughty and appears as though you feel you have nothing to learn from your patients. As a private piano instructor (and active classical performer) with an M.M. from a world-renowned conservatory and 28 years of teaching, I find that my students teach me all the time and that I may derive growth as a teacher from not only my professional organizations, conferences, books, and professional journals, but also, from my students themselves. I am sorry that your forays into the use of exgenous T3 to assist your patients were relatively unsuccessful. If you were to sign up for a functional medicine training on its use, you might find some benefits for your practice.

    It requires a certain humility as well as courage to be willing to venture out into a new and somewhat professionally forbidden area of medical study. I wish you and your patients the very best with their thyroid treatment.

    I also am interested to know whether you have found Levothyroxine-only treatment to eliminate symptoms in most of your hypothyroid patients, and whether you do anything to test and treat Hashimoto’s Disease?

    Thank you.

    1. First, I’m glad that you and your family members have found what works for you. To address some of your points:

      – You and the 60,000 other Hashimoto’s patients on that forum are in the echo chamber. There are a multitude of reasons why those people may feel better and, frankly, you have no idea what they are. For that matter, I would suggest that there are probably a sizable number of people who don’t feel better, hence their involvement in the forum, still searching for answers. But that is merely conjecture, since I also have no way of knowing what’s going on with these folks other than what they choose to self-report in an anonymous forum on the internet.

      – Your conspiracy theory about medical education being suppressed by the makers of Synthroid is both laughable and frightening at the same time. People really believe this nonsense? Well, I suppose so. But since I can’t prove a negative, I guess there’s no way you’ll ever come around on this one.

      – During the time I trained, we were taught why T3 was thought to be unhelpful. But as new data has emerged, doctors who are interested in continual learning (as I am) have been more open to trying it. Contrary to what you suggest, there is no magic to using T3. And yes, I learned how to do it from a real doctor, not a functional one.

      – Just as I would never presume to tell you how to teach piano just because I’m a music lover, it amazes me that you have the hubris to suggest that if only I could find the right quack to teach me how to use T3, I’d have better results. The reason T3 doesn’t usually work is because most people don’t need it. If I wanted to enter full-on quack mode, I’d jack up the dose to heroic levels that have the potential to act as a stimulant, claim success, and call it a day. But I took an oath that said something about “doing no harm.”

      – To answer your last question, I’ve written a bunch of posts that address all that:

    2. My endo has kept me severely hypo since my TT in 2012 (TSH above 40)..he kept increasing Levo but I just felt worse and my tsh never came down… Until I self medicated on T3 in Feb this year and felt like it had my life back! My GP panicked and sent me to see and endo… Luckily for me it was a locum one and he was happy to prescribe combo T4/T3 based on how I feel and blood results. Unfortunately 2 months later my regular endo found out and took me off it (even though it’s dangerous to if not done gradually!) So, I’m back to self prescribing… And you know what? My blood results have never looked better and I feel brill! I’m just so angry that endos will take your thyroid out and then not let you be well afterwards! … in the UK it’s mainly due to the extortionate cost of T3! At least I know there’s a few good endos out there who actually listen to their patients… Unfortunately, it wasn’t my regular one 🙁

  9. My endo has kept me severely hypo since my TT in 2012 (TSH above 40)..he kept increasing Levo but I just felt worse and my tsh never came down… Until I self medicated on T3 in Feb this year and felt like it had my life back! My GP panicked and sent me to see an endo… Luckily for me it was a locum one and he was happy to prescribe combo T4/T3 based on how I feel and blood results. Unfortunately 2 months later my regular endo found out and took me off it (even though it’s dangerous to if not done gradually!) So, I’m back to self prescribing… And you know what? My blood results have never looked better and I feel brill! I’m just so angry that endos will take your thyroid out and then not let you be well afterwards! … in the UK it’s mainly due to the extortionate cost of T3! At least I know there’s a few good endos out there who actually listen to their patients… Unfortunately, it wasn’t my regular one 🙁 For info, I was on 175 Levo and now take 100 Levo & 37 Lio split in 3 doses. I tried all the making sure iron etc is at optimal levels, checking adrenals and taking selenium.. All of which helped but T3 was the missing link for me.

  10. I have hashimoto’s. I was diagnosed in 2009 after going to the ER thinking i was having a heart attack and gaining 60 pounds. I was put on Synthroid then Armour neither of these worked and put me in a hyper state after taking them for a few weeks. Over the years i have tried every natural way known to man to reduce my symptoms of Hypothyroidism and to no avail. Until i was put on T3 only medication. I found a Naturopath who understood the T4/T3 conversion and saw how i was pooling instead of converting. My Reverse T3 was very high and my Free T3 very low. He wanted to put me on Armour and i said no way i want to try T3 only. I started 3 months ago on 2.5 mcg then raised it to 5 mcg taking 2.5 2 x’s a day. Initially my T3 went up when i was on 2.5 mcg. I had my blood work done a couple of days ago after being on 5mcg a day for 6 weeks and my Free T3 went down and my Free T4 has not moved. I feel better on T3 more energy and my stomach issues of acid reflux seemed to change for the better (not as many episodes) I also have SIBO that keeps coming back. Why would my T3 levels not change while taking T3 and why would my T4 not change while taking only T3?

  11. Such hubris and haughtiness. I can see why these qualities in a person can cause their work to suffer. It absolutely closes the mind to the thought that an alternative doc might actually have anything to teach one. Such suffering this hubris causes for patients! This just breaks my heart to see. And to claim that 60,000 patients’ amazing stories of transformation is a big “echo chamber”! This absolutely takes my breath away! To suppose that it is scientific to believe that your limited experience in your practice is more authoritative than that of 60,000 patients! I’m absolutely stunned! It is evident that you,re not using T3 properly, that you’re probably not treating fatigued adrenals and seeing to it that ferritin is at least 70 and vitamin D at least 50 (these three things must be optimized before a T3 preparation can be most effective), and for patients with Hashimoto’s, gluten must be fully renoved from the diet, at the very least. Ideally, the Hashi’s pstkent should be on the AIP diet. See Sarah Ballantyne’s books for 30 pages of references in small print from tbe peer-reviewed medical literature to establish for yourself the basis of the diet. The T3 medications will not work effectively without these things being first addressed. You’ve so much to learn, and it’s great that you tried to be open to T3 but you have learned only just enough to be dangerous. (“A little knowledge is dangerous.”)

    1. Antonia, this is not the site for you. Stick to your echo chamber. The rest of us wish you the best of luck as we cringe at your comments.

    2. I’m on T3 for depression, and I can assure you it’s pleasant enough to be classed as a recreational drug. You feel warm and flexible and strong. Your mood is elevated, you’re full of energy. Of course this only lasts a few hours as the T3 is burned off and the T4 production is down regulated to correct for the mild hyperthyroid. I don’t think I would class it as addictive because you don’t actually feel worse after the effect wears off so you’re not “chasing normal” the way you would with opiates or nicotine.
      BTW it’s poorly understood why T3 augments anti-depressants, but presumably it’s something that happens during that rush where your levels are too high. It’s also not clear if there’s a potential to permanently depress normal T3 production with long term use, which would class it as addictive.

      1. Thanks for that perspective, Christine. If only you had a doctor who was more knowledgeable about the use of T3 (as the previous commenter has suggested) you could spend the rest of your life never coming down from the high. Too bad none of us know what we’re doing.

    3. Wow.
      And that is not a “good” wow.

      My thought today: Endocrinologists do not make enough money….
      (I am not an endocrinologist.)

  12. Thanks for the blogs….very eye opening after reading the woo stuff out there.

    “Five Types of People Who May Need/Like T3” and you mention “Patients who have had their thyroids removed have to rely entirely on T4 to T3 conversion for their T3 needs….”.
    So, would you include people who had RAI for nodules?

    1. I probably wouldn’t include those who have been treated with radioactive iodine for hyperthyroidism due to autonomous (aka hot) nodules. The reason why is, if these folks develop postablative hypothyroidism, they typically don’t develop complete thyroid failure. In other words, the nodules are ablated preferentially, and there may be some collateral damage to the thyroid tissue surrounding the nods, resulting in mild hypothyroidism, but the thyroid is still capable of some amount of function.

      Of course, this is a generalization, and I’m sure there are some people out there who have developed more profound hypothyroidism after RAI for hot nodules. But, in my experience, when people develop hypothyroidism after RAI for nodules, they often do not need a complete replacement dose of T4, and they probably don’t need T3 if that’s the case, either.

  13. Cannot tell you how much I appreciate this timely information. I have many questions but will limit myself to just one for now. Can supplementing with or with too much T3 cause Low Creatinine (via muscle loss)? That’s it…Thanks

    1. I don’t think too much T3 would be likely to cause low Cr, but it could cause muscle loss. Glad this has been helpful, Celeste.

  14. Really interesting article. I have hashimotos and have mostly seen what I thought were real docs but probably what you call quacks. Just went to a local respected endocrinologist who believes as you do and switched me to Synthroid. I had been on a compounded 100mcg T4 and 25mcg T3 for approximately the last 10 years before the switch. I have had uncomfortable heart palpitations for many years (thought that was because of being hypo) which my new doc said was because of T3 meds, as I’ve had a suppressed TSH for many years. They have gone away pretty much in a week since I’m off T3. So frustrating to learn, I’ve been on meds that could be harming me.

    Heres my questions to you. Is 25mcg of T3 for years considered a high dose? Also do you think my body and thyroid can recover from years of having a suppressed TSH and taking T3 meds. The endcrinologist did an ultrasound of my thyroid and said it was very small, but otherwise totally normal and looks like it was put to sleep by these meds. Hoping it will wake up.

    Thank you for this site and an endocrinologists explanation as usually the only info on internet is the alternative and opinions from non docs who are usually guessing.

    1. Yes, 25mcg of liothyronine (Cytomel) would be a big dose for almost anybody. But I have seen naturopaths put people on twice that much…

      I can’t really speak to the permanent damage issue for you, but I can say that for the average, healthy, non-elderly person, the body can (mostly) recover. Bone density can go down after years of taking too much thyroid hormone and may not recover to normal, but it can recover to some extent.

  15. I had a partial thyroidectomy at 19 and a total thyroidectomy in April, 2018 due to suspicious nodule that covered over 2/3 of my left lobe. I also have Hashimotos and could barely function. Path report revealed thyroiditis but no cancer. I am gluten, soy, sugar, and dairy (allergies) free. I am on 75 mcg Synthroid and my Endo just upped me from 5 mcg to 10 mcg Liothyronine, split dose. My TSH is 1.10 (Range: 0.27 – 4.20 uIU/mL), and my FT3 is 2.3 (Range: 2.5 – 4.3 pg/mL). I’m still very lethargic with brain fog. My body temp runs 95.5-96.5 and my blood pressure and heart rate are low. Since increasing my Liothyronine I’ve gone back to restless sleep and hot flashes but my digestion has improved. What would be my next step?

    1. I’m sorry, but I can’t provide medical advice for this type of question. There are just too many things I can’t know about you, so it would be best to talk to doctors who know you. Best wishes.

  16. As I told you, HD, I found this post incredibly helpful. It led me to question whether I was being overmedicated, and now I’m on a small dose of only T4 and doing better. (T3 made me jittery, I found, which was probably an indication I didn’t need it.) Anyway, I found this yesterday and wondered what you thought of it. It’s more evidence that there are a lot of people like me, being given medication unnecessarily, for Hashimoto’s (my TPO level was 292 on diagnosis). Now I’m thinking I may wean off entirely! https://drruscio.com/thyroid-autoimmunity-healthy-levels-thyroid-antibodies/

    1. What do I think of the post you linked to? Ugh, I feel like you’re teeing this up for me. Let me say that I am pleased to see that the DC who wrote it is attempting to bring some sensibility to people who are obsessed with trying to get their antibody levels down – that’s the good part. But otherwise, there are so many inaccuracies and half (quarter)-truths in that post that I’d have to write an entire post of my own to debunk them. Come to think of it, I already debunked some of it in:

      Selenium and the Thyroid – Secrets Your Naturopath Doesn’t Want You to Know
      You Can’t Eat for Your Thyroid

      I wish that chiropractors would stay in their lane – they can be a great resource for mechanical problems with the musculoskeletal system.

  17. My doctor suggested a T3-only trial for me when he could find no other obvious reason for my fatigue; my TSH results were in normal range. I wasn’t aware of what thyroid medication even was, and certainly wasn’t the one to suggest it – so I didn’t come to the table with any pre-conceived ideas about the medication.
    My thyroid medication (liothyronine) was custom compounded for me at a pharmacy due to the limitations of the off the shelf product. We started at 3mcg and went up in increments of 1mcg. At the first dose of 3mcg, my fatigue problems went away – for the sake of the trial of trial and error- we went up to 4mcg, then 5mcg then 6. At 5cmg, I started to experience anxiety but wasn’t sure if it was the medication. At 6mcg I had even more anxiety and also couldn’t sleep. Went back to 4mcg and have been on it now for 8 months or so. 4mcg seems to be the optimum dose for me. If the doctor had put me straight onto 5mcg – without the option of lowering the dose – it would have been a failure and I would have considered T3 to not be a success. Also – my T3 is compounded with a slow release agent – this means I only have to take it once a day and is a little more forgiving for not taking it at the exact same time everyday. My doctor suggests that T3 may not have such a high success rate because it is being administered to the patient incorrectly, 1mcg too much or not enough can make a difference, and he believes it’s essential to have it compounded with a slow release agent.

    1. Although I can’t speak to your situation, I do want to make a few general points for people reading these comments. T3 has been experimented with as a treatment for things other than hypothyroidism, but it is generally not recognized as an accepted treatment for any of these things. That said, there will be anecdotes of people who have felt better with T3 therapy for other conditions.

      As for compounded T3, I am skeptical that it is truly slow-release, as compounding pharmacies claim. If they would publish pharmacokinetic/dynamic data, showing their product really lasts all day, then I would be more receptive to their claims. The pharmaceutical industry has been working for years to make a reliably slow-release T3 product, probably spending millions of dollars in the process, and they haven’t nailed it yet. So the idea that someone in the back of a pharmacy has figured out how to do it consistently and reliably seems far-fetched.

      1. Although I have become reliably asymptomatic since adding Cytomel to T4, I work in big pharma. I, too, question why Pfizer, in its corporate wisdom, doesn’t manufacture sustained- or extended release. (True story: as a teenager, I dated the daughter of the inventor of Contac cold capsules–they worked.) Surely there’s gold in them thar hills and hundreds of thousands of patients for whom T4 just isn’t working who would buy specific doses of a T3 formulation. There is, however, a simple truth: compounded liothyronine SR is just one-third the price of Cytomel!

      2. Literally has told you that she has sustained release. She would know the effects better than you. She is on it. You are slow in the head. I swear to god lol

  18. Very interesting article, thank you so much for posting it!

    I have Hashimoto’s (diagnosed 18 years ago) and have tried every available drug and combinations thereof: T4 only, T3 + T4, T3 only, NDT, NDT + T4.

    I keep coming back to T4 only which keeps my FT4 levels steady close to the upper normal range and my TSH below 1.5 where I feel best.

    I don’t seem able to handle any amount of T3. The tiniest amount (even as little as 5 mcg) suppresses my TSH completely and makes my FT3 levels rise and fall within hours. I feel a rush of energy when the effects of the T3 kick in, I feel tired when they start to wean off so it’s a constant roller coaster.

    I am now back on T4 only (150 mcg daily) and don’t expect to go back on T3 again. I feel more stable on T4 only, without the constant ups and downs.

    Thank you for explaining how the body can make the T3 it needs from T4.

  19. Thank you for this very balanced piece about the T3 controversy. You probably saved me from trying pig thyroid – lol! I had my thyroid removed due to thyroid cancer 25 years ago . I have always ( before and after) had problems with fatigue but in the last few years ( just turned 64) my fatigue has gotten much worse. I continue to look for answers although I’ve pretty much accepted this is just the way I am. Recently, though, I was reading some naturopathy info about T3 and wondering if I should check into that more. After reading your information, though, I have come to the conclusion that with my life long anxiety issues it probably isn’t the right direction to go in. You have most certainly saved me money and time – so thanks!! Also thank you for taking the time to educate people with real facts and research rather than the hearsay and anecdotal stories that much abound.

  20. If the clinical reference paper for a 15:1 ratio of thyroid hormones is A Pilo, et al 1990, may I say that this paper has a major problem, with regard to the radioactive tagging of T3 and T4, and the large amounts of iodine that was used to protect the thyroid glands of the patients being studied. The iodine down regulated the secretion rate, as it should. So we can only assume that the results are incorrect. Not only that, but a paper in Toxnet from 1975, said that no radioactive tagging of liothyronine with either 125I or 131I for in vitro evaluation of thyroid function. Due to high specific activity required, radiation can easily occur……..Dose is not for internal use. Osol, A and JE Hoover, et al. (eds) Remington’s Pharmaceutical Sciences 15th Ed. Easton, Pennsylvania: Mack Publishing co. 1975
    Obviously RAI is now being used but when the thyroid is destroyed under a endocrinologists sayso.

    The A Pilo paper was an extra curve paper from a JJ DiStefano paper on rats. The conclusion on the JJ DiStefano paper being that the rat thyroid secreted 80% T4 and 20% T3, so a ratio of 3:1 – the rat being an equivalence for humans.
    Celi FS from 2010, Pharmacodynamic equivalence of T4 and T3… concluded 3:1 ratio.

    I know I am much better on T3, having tried it for two years. but my new Endocrinologist won’t prescribe. I’m back with hypothyroid symptoms… what a waste of a good life.

  21. I keep wanting to use T4 – I have tried multiple versions (commercial and compounded) with and without T3 (I have Hashimoto’s and if I am off thyroid my TSH goes up and I am very symptomatic) but every time I use any version of T4 I get a systemic allergic reaction. I have been on compounded T3 only for years and I keep worrying it is an issue (although I do have my thyroid panel checked regularly and have been able to keep in a normal range for TSH – suppressed T4 (as would be expected) – and normal T3) The one time my endocrinologist acccidentally sent the compounding pharmacy prescription for T4 instead of T3 without me realizing it – I had a systemic allergic reaction again. Any suggestions? While I am on straight T3, I don’t have issues with heart palpitations, tremors, sweating (although I did a few years back but I think it was from menopause), anxiety, or insomnia but I am concerned because unlike T4 it is not easy to tell from tests if the dose is right and articles like yours make me worry that I should be on T4. I think I am the only patient my endocrinologist has who has been on straight T3 and I think he wants me to be on T4 – but I keep having the allergic reaction to everything we have tried. We have not been able to find T4 that doesn’t cause me to have an allergic reaction. Going off T3 doesn’t work – I get really bad hypothyroid symptoms. I just started searching again but not sure what to do.

    1. I am unable to give individual medical advice, but I can say that people should be aware that Tirosint is a brand of levothyroxine in a gelatin vehicle. It is highly unlikely to be allergic to gelatin, and it is impossible to be allergic to levothyroxine itself. There are no other fillers in Tirosint.

  22. Doctor, I am glad you have found a subset of patients who respond well to your training. That you sneer at the experiences of thousands of patients is terrible. There are more than just one site containing thousands of thyroid patients, by the way. There are at least a million thyroid patients total on these sites. All of them have not found health with the type of treatment you push.

    1. Does he train, or push?

      When has he sneered at patient experiences?

      Appealing to “thousands of thyroid patients” is fallacious.

      The fact that a patient has not “found health” by following only evidence-based treatment doesn’t mean there’s something wrong with the advice.

      In short, where’s your argument against the substantive information offered here?

    2. Unfortunately we humans place far too much weight on our own experience, to the point of ignoring the experiences that contradict themselves.
      For everyone on those sites, there’s someone who tried the same thing and didn’t get a result. Those people leave the site. You say there’s a million. I doubt that. There may have been a million if you count all the people who were there a long time ago and left after it sunk in that the T3 wasn’t actually working.
      Then there’s the fact that most of the posts on these sites are people wondering why the treatment isn’t quite so perfect as they’d thought. “Keep trying.” “Adjust the dose.” “You need to be treated for chronic Lyme.”

      Never “T3 doesn’t work and if it did, it doesn’t work for what you’ve got anyhow.”

      This is why doctors rely on controlled tests. You find some people who have not found health. You give some of them T3, or T4, or nothing, or something else. You don’t tell them what they’ve got, in fact you don’t even know what they’ve got because it came to you without labels. Then you see who really did get better.

  23. After many years of levothyroxine use (for Graves’ disease, ablated with radioactive iodine in 2005), I decided to try “natural” thyroid replacement. I took Naturethroid for a number of months and then suddenly ended up in the ER with my heart going crazy. I was taken off Naturethroid and put back on levothyroxine, which works well enough and hasn’t caused additional heart problems. However, I now have chronic (sometime daily) skipped beats and heart palpitations, which have occurred on and off for over 2 years (ever since the initial episode). Many tests later (cardiologists includes), nobody can say what exactly went wrong. My heart appears healthy in ultrasounds and since I “only” showed 11 seconds of a concerning heart rhythm while wearing a 2-week halter monitor, I’ve been written off as having harmless heartbeat irregularities. Sure doesn’t feel harmless when your heart starts going nuts while you’re just sitting down doing nothing! Btw, I’m almost 39 and this all started when I was 36.

    I’m wondering if you have any knowledge about dessicated pig thyroid hormone use leading to other health problems (like heartbeat irregularities)? What are other compounds in pig thyroid we might be unknowingly ingesting? Can you speak on the possibility of rT3 pooling and then dumping into the bloodstream and what effect that might have on the heart?

    I just wish I had an answer as to what really happened and why it’s ongoing, especially since I stopped the Naturethroid and my labs are all in the normal range now. Obviously you aren’t a cardiologist or my personal doctor, but I figure it’s worth a shot asking. Thanks.

    1. Although I can’t comment on your situation, I can say that high doses of T3 can cause/exacerbate heart problems. Sometimes, it may unmask a heart problem to which someone was already predisposed, and that heart issue may not resolve completely after stopping the T3.

      rT3 does not have any biologic significance, so no, it does not do what you’re suggesting. See this post: Everything You Never Needed to Know About Reverse T3

  24. I wonder if this blogger has any conflicts of interest relating to Levothyroxine . Many patients prefer Natural Dessicated Thyroid as preferable first line treatment. It was used before Levothyroxine ever came to market. First off Levothyroxine is a synthetic big pharma drug. NDT is a natural product in most part coming from a pig. Levothyroxine has an unnatural straggle hold over the market for Thyroid treatment and replacement. Its the inactive storage form of hormone for a start and needs to be coverted to the active T3. Alot of propaganda has been promoted to get this drug as the number one treatment for hypothyroidism. A hell of alot of corruption and kick backs no doubt. Conversion problems are extremely common. Hypothyroidism is vastly underdiagnosed because of “idiot” endocrinologists who have problems reading and interpreting labs values. Central Hypothyroidism is missed often because of overelying on TSH. Inflammation in the body can lead to Hypothyroidism. Conversion issues are actually common. Anybody who is claiming they ain’t is clueless?! Terrible article. Poster could have OCPD traits as hes refering to a statistic and ignoring what he would actually see in clinical practice if everybody was evaluated properly. TSH and T4 is a very bad way to evaluate hypothyroidism. It misses ton’s of people who are hypothyroid. Its idiotic. The current thyroid testing is not up to a very high standard of care in clinical practice and risks angina, coronary thrombosis and heart attacks in people who are untreated hypothyroid. The pituitary is pulsating for a start. There’s been a massive “propaganda” campaign to knock out Levo’s competitors. People like this blog poster just try to use peoples ignorance against them so that you submit to a so called professional’s expert knowledge. Most Endo’s reputations are in a state of disrepair online because of this vary issue. The argument in this blog post coming from the blogger is not a very credible rationalisation. It sounds like the blogger is gullible and has been conditioned by academia and is parrotting information that he’s been mind controlled with.

    1. Where is your evidence that “Conversion problems are extremely common”? In my own case, I was taking WP Thyroid (combo), and it made me jittery. I took straight T4 because of HD and felt a lot better. So I have firsthand experience and am grateful for this blog. Again, where’s your evidence?

        1. Yeah, I briefly considered doing a thorough, line-by-line shredding, as it might have been fun to point out all the fallacies and smears. But maybe it’s worth asking how expensive he thinks Levothyroxine is vs. something like WP Thyroid. I’m spending only a fraction of what I did before. Not a whole lot of money in getting people to switch to the cheap stuff, is there? Plus, if Levotyroxine already “has an unnatural straggle hold over the market,” why do the drug companies need you to shill for them?

          1. Exactly. Generic levothyroxine is anywhere from $12 to $30 for a three month supply. And there is no mechanism in place for me to see any of that money. Conspiracy theories abound, apparently, but there are no kickbacks for prescribing physicians. 😔

  25. Some people do alright on Levo alone with Primary Hypothyroidism. If its really simple and straight forward Levo works. Theres a blatant conspiracy around Levo. For instance in the UK Liothyronine cost so much to prescribe its been withdrawn on the NHS and Dessicated Thyroid isnt licensed. Corrupt as fuck. So the only treatment is Levo but nothing to see here. Literally removed the competitors. Chronically ill people can have conversion problems so need Liothyronine or Dessicated Thyroid. He’s deffo shilling for big pharma. I mean he starts of the blog with Levothyroxine is Natural (its a synthetic drug lol); NDT Isn’t (its natural to a pig as it came from a pig and literally has natural in the title). He starts the whole blog of by twisting reality ffs lol the guy’s a liar. If he can lie about something as simple as that he can lie about anything.

    1. You know, Ryan, I had a great English teacher in high school who used to say, “Life is one long reading test.” You, sir, have failed it for today. How natural is it to ingest something that has a T3:T4 ratio that’s completely different from that which exists in your own body? Particularly something that might damage your heart if you take too much? And you still haven’t brought any evidence that “conversion problems are extremely common.” In fact, you seem to be walking that back, saying “Chronically ill people *can* have conversion problems.” My own Endo, who’s been practicing for decades, told me that fewer than 1% have conversion issues. What evidence do you have to the contrary?

      1. I’ve wondered what a conversion problem actually is. Is it a genetic variant in the gene that codes for a certain enzyme? Is it a consequence of sickle cell anemia? A vitamin deficiency? HIV?

        The thing is that no one would call those things conversion disorder, they’d talk about how an HIV patient might need T3. Which so far as I know they don’t.

        1. Maybe HD can comment on that. All I know is that I apparently don’t have that problem, and I’m so glad that the amount of T3 I was taking before learning this was very small!

  26. Your blog is a breath of fresh air! I am a self-proclaimed health nut/ alternative health consipracy theorist, diagnosed with post-partum hypothyroidism years ago with a TSH of 14 and low T4. (Pretty straightforward hypothyroidism). I did all my “research”, and when my regular doctor refused to prescribe dessicated pig thyroid, I found another doctor. (I threw out the levothyroxine I was given because I had done my “research” and knew it was pure poison). Fast forward to 5 years after being on dessicated thyroid, developing panic attacks and suddenly being hit with extreme heat intolerance, headaches, high fasting blood glucose, and dizziness, I realized that these symptoms became pronounced every time I would take even the smallest dose of dessicated thyroid. My doctor couldn’t understand it because my labs looked normal, even though they were taken first thing in the morning prior to taking my dessicated thyroid. I could no longer tolerate the NDT so had to quit cold turkey! . Upon further research, I suspect that my T3 levels became too high for my system during the daytime and my body could no longer tolerate it. The only thing I could do was switch to T4 medication, and I am still trying to feel “normal”, as I also suspect that my body became accustomed to being overstimulated from the T3. In hindsight, I wish that I had just taken T4 from the beginning, as my hypothyroidism would have likely been very easy to treat and I wouldn’t be dealing with “withdrawal” from the T3, as it has been very difficult. Thank you for your grounded and rational articles…I wish I would have read this years ago (before I found the STTM website and demanded NDT!).

      1. One more question… if someone is on a full replacement dose of levothyroxine at 100mcg for hypothyroidism (not due to thyroidectomy, just plain hypothyroidism), and still symptomatic even with the TSH below 1-2, would a trial of adding T3 to a lowered dose of levothyroxine be justified? If someone requires a full replacement dose can we assume that the thyroid is non-functioning and that conversion of T4 to T3 would be impaired? Thank you again for all of your insight!

        1. if someone is on a full replacement dose of levothyroxine at 100mcg for hypothyroidism (not due to thyroidectomy, just plain hypothyroidism), and still symptomatic even with the TSH below 1-2, would a trial of adding T3 to a lowered dose of levothyroxine be justified?

          That’s reasonable, as long as expectations are kept low (given that it doesn’t do much for most people).

          If someone requires a full replacement dose can we assume that the thyroid is non-functioning and that conversion of T4 to T3 would be impaired?

          The function of the thyroid and conversion of T4 to T3 are separate issues. When someone requires a weight-based “full replacement dose,” we can assume that the thyroid is not contributing much to the overall thyroid hormone level. We cannot make any inferences about T4 to T3 conversion from that. But, given that T4 to T3 conversion is a generally efficient process that is not impaired in the vast majority of people, it’s not something that most people should worry about.

          1. Based on my experience, I would suggest keeping your T4 the same but adding T3 (perhaps compounded sustained-release) at around 15-18% to your morning dose. This is particularly effective when the thyroid tissue is absent due to thyroidectomy or long-term Hashimoto’s.
            IF you start to feel better within days, this may be the root cause of feeling unwell. If that case, I suggest following the protocols in Paul Robinson’s excellent books.
            Thyroid therapy is about the patient’s subjective experience. If you don’t feel well, it doesn’t matter what your bloodwork says. In fact, your body temperature, heart rate, & blood pressure give a far more accurate indication.
            Taking control of your health & finding a physician and/or endocrinologist who is willing to think outside the box is vital.
            Usually, a single T3 dose is not sufficient. Timing is everything, and a circadian dose at bedtime might do the trick to get you back to health.

          2. Paul Robinson is not a doctor, but his books give medical advice. Doctors do not think much of him.
            The problem with a trial and error protocol is that there’s only one of you, and the things you mention:
            feel(ing) better within days…
            subjective experience.
            (not feeling) well
            body temperature
            heart rate,
            blood pressure
            Do not and cannot give an accurate representation of anything. There are thousands of things that cause each of these symptoms, and collectively many millions of things, and the odds are far more likely that it’s a common cold than that it’s a T3 problem. That’s just odds–colds are so damn common that you’re more likely to have an unusual one that exactly matches the symptoms of a T3 problem than you are to have an actual T3 problem.

          3. Well, yes. But Broda Barnes who was a doctor discovered the temperature method for hypothyroid. Placebo effect is a short-term phenomenon. However, when one has been feeling better for months after a long period of adjusting T4/T3 dosages, it’s unlikely to have other etiology.

            In fact, thyroid testing, esp TSH, only provides broad indication of disease. Subclinical differences are often not apparent or ignored by physicians. There need be no other criteria than a patient’s own perception of health. Robinson healed himself over 30 years through trial and error.

            I urge all sufferers to read German endocrinologist Dr. Prof. Rudolf Hörmann’s conclusions here: https://kilpirauhaspotilaat.fi/artikkeli/professor-hoermann-responded-to-statements-from-finnish-endocrinologist.

            It’s about patients taking control over their own health. With some salt, the Internet has leveled the playing field.

  27. I am very grateful for this post. I have been on many of these thyroid Facebook groups and have been given the advice that T4 only treatment is killing me. Even though I feel very well, I looked at their optimal levels for TSH, FT3, RT3.,, and was sure I had a problem. My FT3 was not in the upper range and they claimed I needed T3 only treatment to reduce my high Reverse T3. After a few months of 10 mg of T3 in addition to T4, my blood pressure became elevated and had a horrible racing heartbeat that almost landed me in the ER. When I questioned the T3 treatment, people said my iron levels or cortisol levels… were off or I just wasn’t taking enough. People who disagree with the protocol stop posting or leave because they are attacked for questioning T3. Your post gave me a big breath of relief. My free T3 is in the low part of the range, but I feel well. Maybe it is OK for me. Also, years of being overmedicated has given me Osteoperosis. Very frustrating. I had radiation for Hodgkin’s lymphoma which caused my thyroid problem. Glad to be back on Tirosint and feeling fine.

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