GHK Cu Copper Peptide Skincare Bundle RegenMed Direct 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 InfiniWell, GHK CU, 30 ml 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