NOW Foods L-Cysteine at Supplementstogo.com is a non-essential amino acid that is an important component of hair, nails and the keratin of the skin. L-Cysteine stabilizes protein structure and aids in the formation of collagen, thereby promoting healthy skin, hair and nail texture and elasticity.* DetailsServing Size: 1 TabletSuggested Use: As a dietary supplement, take 1 tablet 1 to 3 times daily as needed.Free of: sugar, salt, starch, yeast, wheat, gluten, corn, soy, milk, egg or preservatives.Other Ingredients: Cellulose, Citric Acid, Silica and Magnesium Stearate and Vegetable Source. Vegetarian Formula.Warnings: CAUTION: Please discard the inedible freshness packet enclosed.Disclaimers: *This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease.