GHK Cu Peptide Rescues Aging Cognition but Splits Molecular Pathways in the Brain News Rapamycin Longevity News The potential of GHK as an anti aging peptide Dou Aging Pathobiology and Therapeutics 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 By age 30, your skin produces about 25% less collagen. By 40, that number can reach 40%. This decline affects more than just how your skin looks. It changes how it heals, Noninvasive and Efficient Peptide Delivery by a Novel Biocompatible Ionic Liquid ACS Sustainable Chemistry & Engineering GHK CU Research Peptide Alpha Carbon Labs