15 Glutathione Benefits: How to Improve Your Mind & Body Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification What is Glutathione & why is it so important ? OptimOZ.com.au What is glutathione and why must we protect patient access to it? 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 Metabolism and Its Implications for Health ScienceDirect