What are the three amino acids that make up glutathione? 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 l Glutamyl l cysteinyl glycine (glutathione; GSH) and GSH related enzymes in the regulation of pro and anti inflammatory cytokines: a signaling transcriptional scenario for redox(y) immunologic sensor(s)? ScienceDirect Glutathione: pharmacological aspects and implications for clinical use Geriatric Care