Making bloodwork work: the impact of sample collection, processing, and storage on plasma glutathione measurement, and implications for translation Translational Psychiatry Interactions between Glutathione (GSH), Vitamin C (ascorbate), Stock Illustration Illustration of species, labeled: 422536697 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, Liposomal Glutathione Reduced Oxidative Stress and Improved Immune Fun Renue By Science