the y glutamyl cycle for transport of amino acids Diagram Quizlet Glutathione, oxidized CAS 27025 41 8 SCBT Santa Cruz Biotechnology Sulfur Amino Acids Metabolism From Protein Synthesis to Glutathione ScienceDirect Catabolism of extracellular glutathione supplies cysteine to support tumours Nature 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, GLUTATHIONEPathway for the biosynthesis of glutathione ** Glutathione is the body's most important antioxidant. Glutathione is made by the coming together chemically of three amino acids. The "Transmethylation Pathway" starts with Homocysteine