AHK CU Dosage Guide: How Much to Use Daily Neurogan Health 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 (Copper Peptide) Cream 30gm Valhalla Vitality GHK Cu Copper Peptide Supplement, Promotes Skin Repair, Reduces Wrinkles CTDE PARIVAR