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 Solution, 1% Ghk cu in Double Hyaluronic Acid Serum Etsy Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow Advanced GHK Cu Copper Peptide Serum 1% (300mg 30 ml (Pack of 1)