Glutathione for Food and Health Applications with Emphasis on Extraction, Identification, and Quantification Methods: A Review Glutathione You Are The Healer 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, Glycine Metabolism and Its Alterations in Obesity and Metabolic Diseases