Just a quick question, how long do I need to stop taking biotin (B Complex tablets) before blood test for TSH, FT4 and hopefully FT3?
I have a test booked for Wednesday 8.30 am and stupidly forgot to stop taking my B Complex. Is five days enough or should I delay blood test for a couple of days to make it seven clear days of no biotin? Blood test appointments are easy to book.
Thank you for your help.
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1965Katy
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This paper reports that the effects of up to 300 micrograms a day are unlikely to have any clinical relevance. And leaving off the supplement for two days should be sufficient on that dose.
The clinical significance of low dose biotin supplements (<300μg/day) in the treatment of patients with hypothyroidism: crucial or overestimated?
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