Advanced GHK Cu Copper Peptide Serum 1% (300mg 30 ml (Pack of 1) Biossance Squalane + Copper Peptide Rapid Plumping Serum Juvasonic + Vitali Copper Peptide (GHK Cu) Bundle 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 Amazon.com: Bargad 5% GHK Cu Copper Peptide Face Serum Anti Aging Firming Serum for Fine Lines & Skin Renewal With 2% Niacinamide, Hyaluronic Acid, Alpha Arbutin & Centella Asiatica All Skin