NOW's Biotin Supplement, with 5,000 mcg, 113g in Vegetarian/Vegan Supports Healthy Hair, Skin, and Nails FOR ENERGY PRODUCTION: Supports amino acid metabolism and promotes normal immune function. Bioton also plays a critical role in skin health for hair, skin, and nails. Notes: Store in a cool dry place after opening. Natural color variation may occur in this product. This product is sold by weight not volume. Not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens. Biotin is a water-soluble vitamin necessary for normal growth and body function. Biotin functions as a key regulatory element in gluconeogenesis, fatty acid synthesis, and in the metabolism of some amino acids. Alongside its role in energy production, Biotin enhances the synthesis of certain proteins. In addition, Biotin promotes healthy immune system function and plays a critical role in skin health (hair, skin, and nails). Natural color variation may occur in this product. Recommended Use: Mix 1/2 level teaspoon daily in 4 to 8 oz. of water or other beverage. Take with a meal.