GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu is a naturally occurring copper peptide that declines with age. At 20: abundant. By 60: you have 60% less. What it does: Stimulates collagen and elastin synthesis Promotes wound Peptide Therapy in The Colony TX GHK Cu Peptide: What It Does for Body Composition and Metabolic Health GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper peptide(GHK Cu) TFA salt 89030 95 5 FC138108