GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Copper Peptide (GHK CU) 1% Serum Shop GHK CU Topical Foam: Enhance Skin and Hair 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 Peptide for Skin & Hair Facial Serum & Scalp Solution