Glutathione is the body's master antioxidant. It is important for handling oxidative stress, detoxification, and immune health. Low glutathione is linked to many chronic illnesses. Knowing what your body needs to make The Emerging Roles of Glutamyl Peptides Produced by Glutamyltransferase and the Glutathione Synthesis System Amino acid glycine hi res stock photography and images Alamy Glutathione is the body's primary internal antioxidant, made using the amino acid cysteine, and it helps protect cells from oxidative stress. Beyond detoxification, research shows glutathione is involved in thyroid hormone metabolism, What are the three amino acids that make up glutathione?