How much biotin will affect a thyroid test? In conclusion, the ingestion of 20 mg or more of biotin may lead to a clinically relevant thyroid assay interference. The clinicians must take this point in consideration before assessing the results of any thyroid function tests.
Can I take biotin if I have hypothyroidism? Another supplement to watch out for is biotin, commonly taken for hair, skin, and nail benefits. Biotin doesn’t interfere with your thyroid medication, but it does interfere with your thyroid blood test and can mess up your numbers. Stop taking biotin at least 2 days before having a TSH blood test done.
Can too much biotin affect your thyroid? Biotin is a common component of multivitamin preparations and at high doses it has been reported to cause interference in immunoassays resulting in abnormal thyroid function tests [2].