Biotin and levothyroxine

[Gwilt160981]

Anyone had biotin whilst on levothyroxine and has it affected your thyroid blood test results in anyway?

Yes!!! It can make you appear like you have an overactive thyroid. I take high dose biotin and need to stop it for 48hrs before my regular blood tests. It doesn't affect your thyroid function, just screws up the test results.

Seconded. Before I realised this, I had my dose reduced twice, which made me very unwell indeed.

🙀🙀🙀 how much biotin messes up the tests and how?

I don't take it separately but obviously it's in my b complex vitamins, not that I remember them every day but thyroid has gone extra haywire lately and it's such a pain - endo knows I take b vitamins but has never mentioned they can interfere with test results 🙀

Your doctor may not know. Mine didn't.

endocrinenews.endocrine.org/january-2016-thyroid-month-beware-of-biotin/

Oh my god!

Thanks! this could explain EVERYTHING

These are the ones they are most worried about (TFT is just testing TSH, T4, T3) the fT3 and antibodies are an issue (no TSH, T4 has finally come down into range but T3 refuses to budge so thyroid stuck in negative feedback to pituitary and it's annoying!) have been on and off carbimazole forever and now endo wants to change tactics whatever that means.

fancy it doesn't sound likely to be the problem if it's just a b complex. Problems are usually with high doses. However, it would certainly be a good idea to stop all biotin for 24hrs before the next blood tests.

I definitely will avoid, it says it has 300% of rda of b7 among all the others so it could be skewing results, although tbh I only started taking b vitamins to help with brain health because of producing way too much thyroxine in the first place