Description Structural Support Healthy Skin, Hair and Nails With Vitamin B-6 and C Non-GMO A Dietary Supplement Kosher Amino Acids GMP Quality Assured L-Cysteine is a non-essential sulfur amino acid, which plays a critical role in methionine, taurine and glutathione metabolism. It is also an important component of hair, nails and the keratin of the skin. L-Cysteine stabilizes protein structure and aids in the formation of collagen, being thereby indispensable to skin, hair and nail health. Suggested Use Take 1 tablet 1 to 3 times daily as needed. Other Ingredients Cellulose, silica, magnesium stearate (vegetable source), citric acid and vegetarian coating. Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens. Add $2 for normal postage and &4 for registered postage.