No. 1 brand for hair, skin & nails (Source: IRI Total US - Multi Outlet: Latest 52 weeks ending 11/28/21). Over 2x biotin (Compared to Nature's Bounty Optimal Solutions hair, skin & nails gummies). With keratin. Beauty starts on the inside. At Nature's Bounty, we believe health and beauty go hand in hand. With 50 years of making quality vitamins and more than 20 years in the beauty business, you can trust that every Nature's Bounty product is backed by science, and made with the purest ingredients - guaranteed. With added keratin. Food safe.