Products Skin Care Copper Peptide Serums Skin Biology 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 Multi Peptide + Copper Peptides 1% The Ordinary Cellular Glow Copper Peptide GHK Cu Serum for Face GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect