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 Copper Peptides Serum for Face 2% Copper Peptide with 4% Epidermal Growth Factor (EGF Serum) Niacinamide Ceramides Squalane & Hyaluronic Acid Multi GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B PDRN GHK Cu Serum for Firming & Skin Repair Clean + Kind am+pm 5% B5+GHK Cu Hydrating Serum NARKO