Dietary supplement. Glutathione is composed of the amino acids L-cysteine, L-glutamic acid, and glycine. It is a potent antioxidant and works in the liver to protect the body from harmful substances. it also functions as a precursor to glutathione peroxidase, a key antioxidant enzyme, which protects against lipid peroxidation (fats turning rancid) (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease). Suitable for vegetarians and hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contain no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.