Glutathione is a small peptide molecule composed of three amino acids,cysteine, glutamic acid, and glycine. It is produced primarily in the liver and is involved in many critical biological functions in the body including metabolism of toxins, immune system function, protection against oxidative cell damage, and recycling of vitamins E and C. This product has Glutathione in its reduced, active form for optimal bioavailability.Natural color variation may occur in this product.