Glutathione Test: The Master Antioxidant and Key for Health and Resilience NutriScape.Net 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 Benefits for Gut Health Nikki Yelton RD Differentiating Changes in Glutathione Levels from Cytotoxic Events Using Multiplexed Assays Glutathione Assays To Monitor Oxidative Stress