Established 1971 (5,000 mcg) Gluten-Free A Vitamin Supplement for Healthy Hair, Scalp and Nails Dietary Supplement Kosher Parve — Our Pledge of Integrity — Authenticity Cleanliness Freshness Consistency Accuracy Biotin is a water soluble B vitamin that supports the formation of keratin, a building block for skin, hair and nails. Biotin also supports energy metabolism.