Glycine: A Key Player in Cancer Prevention and Cellular Health Leigh Erin Connealy, MD Our ancestors ate whole animals. Skin, cartilage, tendons, bones, organs. That meant they consumed massive amounts of glycine from collagen rich tissues. Modern humans eat almost exclusively muscle meat, which is extremely high Glycine supplementation can partially restore oxidative stress associated glutathione deficiency in ageing cats British Journal of Nutrition Cambridge Core Glycine: The Unsung Hero of Sleep, Detox, and Metabolic Health Dietary glycine supplementation enhances syntheses of creatine and glutathione by tissues of hybrid striped bass (Morone saxatilis Morone chrysops ) fed soybean meal based diets Journal of Animal Science and