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. 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 Glutathione: The Critical Role It Plays in Multiple Sclerosis Root A Vi Glutathione Precursors Tri Peptide Formula Glycine, Glutamine & NAC Enhanced with Na RALA, Biotin, Selenium, Molybdenum & HEPURE for Efficient Glutathione Production UK Made to GMP Standards : Amazon.co.uk: Health L Glutamine Administration Reduces Oxidized Glutathione and MAP Kinase Signaling in Dystrophic Muscle of mdx Mice Pediatric Research