Biotin is found in egg yolks, brewer's yeast, bananas, lentils, cauliflower, and salmon. This B vitamin strengthens skin, hair, and nails. (A deficiency is extremely rare because bacteria in your intestines make all the biotin you need.) A deficit can lead to hair loss or dermatitis (itchy, scaly skin). Some people swear by biotin supplements to strengthen brittle nails, but studies have not proven that it's beneficial for anyone who's not deficient in the vitamin.
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Simple Skin Beauty: Every Woman's Guide to a Lifetime of Healthy, Gorgeous SkinBuy book
