Glycine: A Powerful Amino Acid for Midlife Women's Health GSH exists as a tri amino acid combination of glycine, cysteine, and Download Scientific Diagram Glutathione for Food and Health Applications with Emphasis on Extraction, Identification, and Quantification Methods: A Review 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,