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Most hair supplements lead with biotin. ProCare Hair, Skin & Nails starts with structure. Hair fibers are composed of keratin — a structural protein that relies on sulfur-containing amino acids, connective tissue support, and trace mineral cofactors to maintain its integrity. This formula was built around all of it: bioavailable keratin peptides, sulfur donors, amino acids that support connective tissue, and the trace minerals involved in tissue health.* Formulated to complement your multivitamin, not duplicate it.