OBM Geriatrics The Effect of the Human Plasma Molecule GHK Cu on Stem Cell Actions and Expression of Relevant Genes GHK Cu is a naturally occurring tripeptide in human plasma. Levels average 200 ng ml at age 20 and drop to 80 ng ml by age 60 (Pickart et al., 2020). That decline tracks with GHK Cu Copper Peptide Benefits, Uses & Safety Intra V The potential of GHK as an anti aging peptide Dou Aging Pathobiology and Therapeutics GHK CU Beverly Hills Rejuvenation Center The naturally occurring peptide GHK reverses age related fibrosis by modulating myofibroblast function He Aging Pathobiology and Therapeutics