Functions of glutathione. Download Scientific Diagram What is glutathione? Know as the most important antioxidant in the body, glutathione is an essential antioxidant manufactured in all cells, but primarily in the liver. It is essential because 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 responsive nanomedicine leverages tumor redox imbalance for targeted cancer theranostics Discover Oncology Springer Nature Link