Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy GHK CU Infiniwell GHK CU Topical Serum 30ml Azur Skin GHK Cu Topical Hair Foam LeadWest Medical 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 GHK CU 30ml by InfiniWell