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 Serum for Face Anti Wrinkle Increase Collagen Anti Aging Peptide Labz Copper Peptides Serum for Face 2% Copper Peptide with 4% Epidermal Growth Factor (EGF Serum) Niacinamide Ceramides Squalane & Hyaluronic Acid Multi PDRN GHK Cu Serum for Firming & Skin Repair Clean + Kind COPPER PEPTIDES FOR HAIR GROWTH Ultrastrong 10% GHK Cu Formula with Sonora Supply Co.