Glutathione is a tripeptide antioxidant composed of three amino acids: cysteine, glycine, and glutamine. It plays a crucial role in protecting cells from oxidative stress and damage by neutralizing free radicals and reactive oxygen species. Glutathione is involved in numerous cellular processes, including detoxification, immune function, and DNA repair. Research on glutathione focuses on its role in human health and disease, its potential therapeutic applications, and ways to increase its levels in the body.