How can biotin mess up thyroid labs?

High-dose biotin can interfere with some thyroid immunoassays and produce misleading results. If you use hair or skin supplements with biotin, tell the lab and your clinician before interpreting TSH or free T4. This matters more often than any exotic peptide interaction.

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of thyroid and hashimoto's. What people ask about peptides and thyroid disease, what evidence exists, and why thyroid medication timing still comes first.