GHK Cu (Copper Peptide): What the Data Actually Suggests, GHK Cu is a naturally occurring tripeptide (glycyl L histidyl L lysine) bound to copper, identified in human plasma and known to decline with 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 Analysis of Data From Breast Diseases Treated With 5 Alpha Reductase Inhibitors for Benign Prostatic Hyperplasia Clinical Breast Cancer Figure 3 from 5 Alpha reductase inhibitors in the management of benign prostatic hyperplasia : A rationale Semantic Scholar