Shereene IdrissBoard Certified Derm, Founder and Chief Nerd

Biotin isn’t always the answer for strong nails and hair

22 Jun 2026 · 0 min

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0:18

Dermatologist Shereene Idriss explains why biotin supplements won't fix weak nails for most people. True biotin deficiency is extremely rare, and excess biotin can interfere with thyroid function tests, potentially hiding real thyroid problems.

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