Your Glutathione Index Defines How Your Cells Are Ageing 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, Blood Plasma Quality Control by Plasma Glutathione Status Protocol for measuring erythrocyte glutathione reductase activity coefficient to assess riboflavin status ScienceDirect Glutathione Quantification GSSG GSH Quantification Kit Oxidized Reduced Glutathione Assay Dojindo Glutathione bioavailability increases with novel formulation