Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum Copper Peptides Serum for Face 2% Copper Peptide with 4% Epidermal Growth Factor (EGF Serum) Niacinamide Ceramides Squalane & Hyaluronic Acid Multi Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 How to Layer Haloxyl and GHK Cu for Tired Eyes 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