Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol Copper Peptides Serum for Face 2% Copper Peptide with 4% Epidermal Growth Factor (EGF Serum) Niacinamide Ceramides Squalane & Hyaluronic Acid Multi Let's talk about one of my FAVORITE glow peptides: GHK Cu GHK Cu (Copper Peptide) is a naturally occurring peptide in your body that plays a HUGE role in healing, repair, and overall Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000