How long does it take for biotin to work on nails? four to six months
Does biotin help hair and nail growth? Despite its popularity, to date there is no evidence that it promotes hair and nail growth or quality in otherwise healthy patients. Patients must be warned that biotin supplementation could adversely affect streptavidin/biotin-based laboratory assays.
Can biotin make nails worse? Whether it comes in gummy form or pill form, the claim is always the same: Taking biotin, the labels claim, will help you get healthy hair, skin, and nails. The problem is that — even if you take it religiously — a biotin supplement probably won’t change your hair, nails, or skin at all.
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What Does Biotin Do For Nails
But several studies show that biotin can strengthen brittle nails, making them less likely to split or break, so you may be able to grow your nails longer after taking the supplement regularly.