Glutathione is a naturally occurring tripeptide composed of glutamine, cysteine, and glycine. It is primarily studied for its role as a major intracellular antioxidant, helping regulate cellular redox balance and protect cells from oxidative stress. It has also been examined for its involvement in detoxification pathways, immune function, mitochondrial activity, and the recycling of other antioxidants, including vitamins C and E. For laboratory research only — not for human use.