Not all Copper Peptides are created equal If you've tried copper peptides before and saw no change, here is why: Concentration and Stability. Most serums use a diluted solution that barely scratches Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 GHK Cu Body Lotion 5000mg, Copper Peptide, 8oz Neurogan Health Advanced GHK Cu Face Cream 2400mg 4% Firmer Skin Neurogan Neurogan Health