GHK cu Serum by mccosmetics New Youth mccosmetics.ny GHK CU Copper Peptide, Face Serum, 1 oz (30 ml) GHK Cu Blue Copper Peptide + Betaine Serum Wonderlini exquisite skincare 1% GHK CU Copper Tripeptide Serum w Hyaluronic Acid Niacinamide Planet Eden 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