This document discusses glutathione, the body's most powerful antioxidant. It is a tripeptide composed of glutamic acid, cysteine, and glycine. Glutathione exists in reduced and oxidized forms and plays a key role in defending cells from free radicals and toxins. Low glutathione levels are associated with many health conditions like aging, Alzheimer's, and cancer. Maintaining optimal glutathione appears important for health, though more research is still needed to fully understand its role in disease.