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 Regenerating Serum for Glowing Skin and Hair Copper Tripeptide 1, Great Price, Copper Peptide, Powder, High Purity Cosmetic Grade Dermafactors Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with Pptido de cobre GHK GHK Cu Tripptido 1