Your diet is lacking You probably already know that your diet affects your skin, but it also affects your pretty much every other part of your body too, including your nails. "Not eating enough protein can hinder the growth of nails and genes also play a big part in having brittle nails," says Saulsbery. "A biotin supplement, like Olly Undeniable Beauty, $11.89, is a great way to strengthen nails and promote growth." She also recommends drinking lots of water to help keep nails and cuticles hydrated.
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