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 40% Off! Neurogan GHK Cu Copper Peptide Hair & Scalp Serum 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper 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 May patients receiving 5 alpha reductase inhibitors be in higher risk of COVID 19 complications? ScienceDirect