Nutrition
Biotin Thyroid Lab Interference
Biotin thyroid lab interference from high-dose hair and nail supplements can falsely skew TSH and free T4—pause megadoses before blood draws.
Biotin thyroid lab interference is real: high-dose biotin in hair and nail supplements can falsely skew some immunoassay thyroid tests—TSH, free T4, and others may look abnormal when you feel fine. Stop high-dose biotin for at least forty-eight to seventy-two hours before draws unless your clinician says otherwise; confirm with the lab.
Beauty stacks hide on ingredient labels as megadoses. Report all supplements at blood work.
Common questions
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Does food-level biotin affect thyroid labs?
Routine dietary biotin is usually fine—high-dose capsules and gummies cause most assay interference. Tell clinicians every supplement before testing.
Related terms
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