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 Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum Copper Peptide 10% GHK CU, 5% AHK CU with Oligopeptide 1 Hair Treatment Serum eBay Buffet" + Copper Peptides 1% The Ordinary Sephora Multi Peptide + Copper Peptides 1% The Ordinary Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000