Glutathione (L) Natural Tripeptide of Amino Acids Glycine, Glutamine Prescribed For Life Glycine Metabolism and Its Alterations in Obesity and Metabolic Diseases 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, Glutathione Amino Acids: Why Supplements May Not Work Glycine: A Key Player in Cancer Prevention and Cellular Health Leigh Erin Connealy, MD Glycine supplementation can partially restore oxidative stress associated glutathione deficiency in ageing cats British Journal of Nutrition Cambridge Core