Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 Not all copper peptide serums are formulated the same Before you buy one, make sure you're actually getting pure GHK Cu at the right concentration not just a diluted blend. We spent Intensive Anti Aging Serum with Copper Peptide(GHK Cu) and Hyaluronic Acid eBay 1% GHK CU Copper Tripeptide Serum w Hyaluronic Acid Niacinamide Planet Eden Amazon.com: Copper Peptides GHK Cu Hydra Serum with Hyaluronic Acid Facial Serum for Tightening, Collagen Support, Renewing, Elasticity & Smooth Youthful Looking Skin (30ml 1fl.oz) : Beauty & Personal Care