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, Measurement of Glutathione as a Tool for Oxidative Stress Studies by High Performance Liquid Chromatography Your Glutathione Index Defines How Your Cells Are Ageing Differentiating Changes in Glutathione Levels from Cytotoxic Events Using Multiplexed Assays Glutathione Test: The Master Antioxidant and Key for Health and Resilience NutriScape.Net Quantitative real time imaging of glutathione Nature Communications