High-Strength Biotin Formula: Each serving provides10,000mcg Biotin, plus10mg Zinc and55mcg Selenium to support the maintenance of normal hair, skin and nails. Microcrystalline Cellulose (Plant-Based Binding Agent), Zinc Citrate Dihydrate, D-Biotin, Magnesium Stearate (Plant-Based Anti-Caking Agent), Sodium Selenite.