Source Naturals, Reduced Glutathione, 250 mg, 60 TabsProduct Description Dietary supplement Product Benefits 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).* Ingredients Untitled 3 Supplement Facts Serving Size: 1 Capsule