Helloskin GHK Cu 1% Triple Peptide Regenerative Serum 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: GHK Cu Copper Peptides Serum for Face: Advanced Anti Aging Serum with Multi Peptide and Niacinamide for Fine Lines and Skin Elasticity : Beauty & Personal Care MELAO Ghk Cu Copper Peptide Serum Anti Aging Face & Neck Copper Peptide (GHK Cu) 2% Recovery Serum