Glutathione Index Test Measure Antioxidant Levels At Home Fatty Acid Labs Total Glutathione Test Our Comprehensive Organic Acids Test (OAT) MosaicDX 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, Determination of l glutathione by spot test and spectrophotometric methods based on its interaction with phenazine Analytical Methods (RSC Publishing)