The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline The first order degradation profiles of GHK Cu in various medium stored Download Scientific Diagram Your body made this peptide every day until you turned 30. Then it stopped. GHK Cu (copper peptide) is a naturally occurring tripeptide discovered in 1973. At age 20, your plasma levels sit How GHK Peptide Works Signaling GHK acts as a switch for skin repair: Interacts with adenosine receptors reduces inflammation Activates MAPK ERK, PI3K Akt, TGF pathways Stimulates fibroblasts & keratinocytes boosts collagen, elastin