Cells need a steady supply of antioxidants to defend themselves, and glutathione is the body's master defender. Yet, daily stress and ageing can deplete glutathione faster than we can make it. NAC + An Unusual Case of 5 Oxoproline Acidosis Kidney Medicine 2F8A: Crystal structure of the selenocysteine to glycine mutant of human glutathione peroxidase 1 Supplementation with a combination of glycine and N acetylcysteine (precursors to glutathione) improved glutathione levels, oxidative stress, mitochondrial function, muscle strength, exercise capacity, cognition in older individuals. The supplement