Copper Peptides (GHK Cu) & Beard Growth : r Minoxbeards 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 Thrive Copper Peptide Serum Skin Barrier Support & Hydration 29ml