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Mehmet Oz, MD, Cardiology, answeredBrittle nails that are soft, thin and easily torn are a problem for many women. The solution is biotin, a B vitamin that helps strengthen nails. Before opting for a biotin supplement, try snacking on walnuts. As well as being an excellent source of biotin, walnuts are rich in other beauty enhancers -- like wrinkle-reducing omega-3s.