L-Cysteine 500mg by Solgar 30 VegCap L-Cysteine 500mg 30 VegCap L-Cysteine is a sulfur-containing amino acid that helps synthesize keratin a protein found in skin hair and nails. It is also a precursor to L-Glutathione a tripeptide involved in one of the body"s detoxification systems. This product provides Free Form L-Cysteine to promote optimal absorption and assimilation. Supplement Facts Serving Size 1 Vegetarian Capsule Amount Per Serving Daily Value L-Cysteine (as L-cysteine HCl) (Free Form) 500 mg Percent Daily Values are based on a 2 000 calorie diet Other Ingredients Vegetable Cellulose Vegetable Magnesium Stearate Silica Microcrystalline Cellulose. Does not contain Gluten Wheat Dairy Soy Yeast Sugar Sodium Artificial Flavor Sweetener Preservatives and Color. Warnings Keep out of reach of children. As with all dietary supplements consult your healthcare professional before use. See product label for more information.