Thyroid UK
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need advice changing from T3 to thyroid-s

Hi, I have been taking T3 only (from Mexico) for approx 3 months changing after starting out on Levothyroxine 125mcg 2 years ago.

It's been not too bad on the T3 but I can only take up to 30 mcg a day, it feels a bit on the "fierce" side so I am hoping the Thyroid -s will feel a bit gentler, and that I will feel better on altogether, here's hoping anyway!

I got it on [line], and its from Thailand, I would be grateful for any advice on dosing etc, especially as the tablets are in mg not mcg.

thank you so much in advance, Sue

Edited source in line with posting guideline #22, Clutter.

4 Replies

Susie, Content in one tablet (60 mg thyroid extract): approximately 38 mcg Levothyroxine (T4) and 9 mcg Liothyronine (T3); Source of extract: Porcine

One tablet is roughly equivalent to 75mcg-100mcg Levothyroxine. 30mcg T3 is equivalent to 90mcg Levothyroxine.

Try 1/2 to 3/4 of a tablet split into two doses for a few days to see how you tolerate it but bear in mind it will take 7/10 days for the T4 to get into your system so you may need a reduced dose of T3 to tide you over until then.

1 like

Clutter, thank you so much, and for all the good advice and help you always give me,

best wishes,


Do you know why you couldn't tolerate higher doses of t3? Have you had a coritisol stress test done, and all the other bloods like iron and vit D?


Hi sulamaye, haven't had cortisol stress done, my GP wouldn't , I was anaemic 6 weeks ago and was put on ferritin, folate and B12, even though I was already taking the B 12, anyway, I tried higher doses of the T3 and always went hyper, my blue horizon tests flagged it up as hyper too, so 30/35 mcg was the most I could take, was better on T3 than on the levo, but thought as I want to feel the best I can I would try the thyroid-s.


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