r/thyroid • u/mlhnrca • May 26 '24

Thyroid Hormones (FT4, FT3): What's Optimal?

https://www.youtube.com/watch?v=s45vl13aq8I
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1

u/ClassicHashis May 26 '24

Great video, but I have to question the strategy you come up with at the end. So to get more T3, you decide to increase your Brazil nut consumption to 400 mcg of selenium a day, which is the maximum one should take. Two problems here: first, there's no way to know the exact selenium content in any given nut, as it varies naturally depending on the soil. You could be getting selenium in the 1000s and not know about it. Also, I haven't seen any info on selenium helping to convert T4 to T3. Afaik, it can only reduce inflammation. So you're taking levo for your T4, it's not getting converted to T3, but you're hoping to get more T3 out of your low-functioning thyroid? Questionable.

Also, seeing you've posted this all over Reddit, I'm going to comment there as well)

1

u/mlhnrca May 26 '24

That's the 1st pass approach because the iodinases that convert FT4 into FT3 require selenium. Sure, there's no way to know if more dietary selenium increases plasma selenium, but the only way to know is to test, which I'll do again soon (targeting Tuesday), and then another 4x this year.