NOW Glutathione 250 mg vegetarian capsules provide the reduced, active form of glutathione, a small peptide composed of cysteine, glutamic acid, and glycine, naturally produced by every cell in the body, with particularly high levels in the liver. This potent antioxidant supports healthy immune system function, proper detoxification processes, and cellular health by neutralizing free radicals and maintaining the activity of vitamins C and E. Designed for optimal bioavailability, this non-GMO, vegetarian/vegan, kosher supplement is family-owned since 1968 and manufactured under GMP quality standards.