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Although biotin does benefit hair, skin, and nails, supplementation is only effective if you have a deficiency, which is relatively rare
186 WahrleS.DasP.NyborgA
Others can cause increased absorption, causing side effects or an overdose
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The human research is early but the preclinical literature is deep and consistent
Second, demand lot-specific data: identity by mass spectrometry and HPLC purity tied to the exact vial, because coordination chemistry and stoichiometry are reproducibility variables, not cosmetic details
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