Comparing the efficacy of glutathione and N acetylcysteine in replenishing intracellular GSH Replenishment of Glutathione Levels Improves Mucosal Function in Experimental Acute Colitis Laboratory Investigation APLB Glutathione Niacinamide Sheet Mask, 10 PCS Masksheets What is glutathione and why must we protect patient access to it? 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.