Dietary supplement. L-Glutathione is a biologically active sulfur amino acid tripeptide compound containing three amino acids: L-Cysteine, L-Glutamic Acid and Glycine. Twinlab L-Glutathione capsules are easier to swallow and assimilate. Economical amino acid nourishment that delivers potent antioxidant protection. Each capsule delivers 100 mg of l-glutathione nourishment. It is a natural protein comprised of three amino acids.