GHK Cu Copper Tripeptide 1 Research Reagent GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? 7% GHK CU ACCELERANT Platinum Skin Care GHK CU Research Peptide Alpha Carbon Labs Defy GHK Cu (glycyl L histidyl L lysine) is a naturally occurring copper binding peptide found in human plasma. As levels decline with age, so may its support of the biological processes involved in collagen production, skin