Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy GHK CU Topical Serum Kit 50ml Azur Skin GHK Copper Peptide GHK Cu Tripeptide 1 GHK CU VIBRANCY MICRONEEDLING KIT LUX LAB 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