Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation Physical Exercise Counteracts Impaired Cognition by Improving Mitochondrial Function GSH redox cycling Hyperoxide detoxication Encyclopedia of the Environment Selenoglutathione Diselenide: Unique Redox Reactions in the GPx Like Catalytic Cycle and Repairing of Disulfide Bonds in Scrambled Protein Biochemistry Endogenous Glutathione Conjugates: Occurrence and Biological Functions Pharmacological Reviews