Glutamine in the Fetus and Critically Ill Low Birth Weight Neonate: Metabolism and Mechanism of Action The Journal of Nutrition Glutamine vs. Glutathione: Their Relationship and Glutamate's Role Troscriptions Glutathione is an antioxidant that's made up of the three amino acids glutamine, glycine, and cysteineall of which are rich in the mineral sulfur. The main functions of glutathione are to fend off Glutathione Amino Acids: Why Supplements May Not Work