Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs Good skin starts with the right ingredients. We made the GHK Cu Peptide Serum for people who want real results without the clinical experience. Copper peptides, hyaluronic acid, niacinamide and more, in one Intense Copper Binding GHK Cu 5% +Palmitoyl Oligopeptide 0.3% Repair S Double Bay Cosmeceuticals GHK Copper Peptide GHK Cu Tripeptide 1