Glutathione is the body's primary internal antioxidant, made using the amino acid cysteine, and it helps protect cells from oxidative stress. Beyond detoxification, research shows glutathione is involved in thyroid hormone metabolism, Vitamin C: Metabolism and Function Astrocytes Role in Parkinson: A Double Edged Sword IntechOpen Frontiers Glutathione: Pharmacological aspects and implications for clinical use in non alcoholic fatty liver disease Glutathione an overview ScienceDirect Topics Central nervous system uptake of intranasal glutathione in Parkinson's disease npj Parkinson's Disease