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In page Dietary supplement:

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Beauty supplements, particularly those aimed at improving the health of skin, hair, and nails, are commonly marketed within the wellness and supplement markets. These products typically include ingredients, such as collagen, which is reputed to improve the appearance and condition of skin, hair, and nails. Other typical ingredients include biotin, keratin, and omega-3 fatty acids, which are promoted for their alleged benefits to skin and hair health. Demand for these beauty supplements has risen markedly in the 21st century.[citation needed] Despite the apparent rise in demand, scientific evidence supporting the efficacy of ingredients like biotin for the purpose of hair growth remains unproven.[1]