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 Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 GHK Cu Blue Copper Peptide + Betaine Serum Wonderlini exquisite skincare PeptideLabz Copper Peptide 10% GHK CU 5% AHK CU Peptides Hair Growth Treatment Serum, Blue Price Private Label GHK Cu Copper Peptide Firming Anti Aging Skincare Sets Private Label GHK Cu Copper Peptide Firming Anti Aging Skincare Sets