biotin
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Be Aware: Your Favorite Beauty Secret May Be More Trouble Than It’s Worth
We’re not quite sure when the buzz began about biotin, but suddenly, it seemed, every woman we knew was taking the vitamin—also called B7 or vitamin H—to support hair and nail growth. And indeed, while research is sparse, at least one double-blind study concluded that Viviscal, a supplement containing biotin, not only supported hair growth…