Copper Peptide Hair Growth Serum (GHK Cu & AHK Cu) GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect Copper Peptide Hair Growth Serum for Hair Loss & Thinning Hair Feline Skinscience 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