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, Amazon.com: CONTINUAL G Powder Clinically Proven Cellular Glutathione Precursor Benefit of Glyteine & Sunfiber Immune Support, Master Antioxidant, Detox, Brain Health & Skin Care 180 Sachets : Health & Household What is Glutathione & why is it so important ? OptimOZ.com.au PDF] Blood glutathione concentrations in a large scale human study. Semantic Scholar