Glutathione, often dubbed the master antioxidant plays a crucial role in detoxification, immune function, and protecting our cells from oxidative stress. Here are some signs that your levels might be low: Persistent Frontiers Glutaminolysis and CD4+ T cell metabolism in autoimmunity: From pathogenesis to therapy prospects It turns out that T cells utilize quite a bit of glutamine to a) replenish TCA cycle intermediates ('anaplerosis') as well as to b) exchange for other amino acids. Monosodium Glutamate MSG, Glutamic Acid Glutamate, Glutamine Review Hammer Nutrition