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 DIABETES (wheel) SpectraCell Laboratories PDF) The Role of Glutathione Insufficiency in Immune Dysfunction and Increased Susceptibility to SARS CoV 2 Infections in Type 2 Diabetes Improved glycemic control either alone, or combined with antioxidant supplementation, fails to restore blood glutathione or markers of oxidative stress in adolescents with poorly controlled type 1 diabetes ScienceDirect Diabetes Type 1 Type 2: A Comprehensive Guide The Medical Biochemistry Page