Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification Glutathione is an antioxidant that's made up of the three amino acidsglutamine, glycine, and cysteineall of which are rich in the mineral sulfur. The main functions of glutathione are to fend off Glutathione The Ultimate Antioxidant Purifi IV Glutathione: What It Is, Why You Need It, How You Can Increase It The Amino Company