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 The Importance of Glutathione in Health and Healing Dr. Todd Maderis Glutathione for Food and Health Applications with Emphasis on Extraction, Identification, and Quantification Methods: A Review Glutathione (L) Natural Tripeptide of Amino Acids Glycine, Glutamine Prescribed For Life