Catabolism of extracellular glutathione supplies cysteine to support tumours Nature Glutathione (GSH) Intracellular Antioxidant, Liver Support Glutathione is often called the body's master antioxidant for a reason It plays a central role in protecting cells from oxidative stress, supporting detoxification pathways, and maintaining immune function. As levels How Do Cells Produce Glutathione? Glutathione Reporter