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 GHK Cu Peptide Puratek Peptides USA Buy GHK CU Peptides Topicals, Tablets, Hair & Nasal Sprays Safe, Tested Copper Peptide Supplements Neurogan Health