GHK CU Cosmetic for Healthy Skin Aging and Wrinkle Support Pure Prescriptions 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 Amazon.com: Skin Perfection GHK Cu Copper Peptide Powder 99.7% Pure DIY Copper Peptides Serum for Face and Scalp Cosmetic Grade GHK Cu 1 Gram Creates Up to 100ml for Fuller Hair and 99% GHK Cu Peptide Powder Cosmetic Grade Copper Tripeptide 1 (GHK Cu) Blue Copper Peptide GHK Copper Lyophilized Pure Powder