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Avoid Biotin Before Hormone Labs
If taking 300 micrograms or more of biotin for seven days, avoid it before hormone testing because it can distort steroid hormone lab assays including estradiol, progesterone, hCG, TSH, and testosterone. This includes high-biotin hair, skin, and nail supplements and is especially relevant before hormone panels or IVF monitoring.
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“Biotin levels of taking a biotin supplementation of 300 micrograms or more for seven days can actually influence your lab assays for sex hormones or for any steroid hormone, actually.”
huberman · How Women Can Improve Their Fertility & Hormone Health | Dr. Natalie Crawford · Apr 13, 2026 · 2:16:11 · open ↗
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