Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com Copper Peptide (GHK Cu) Serum Copper Peptides vs. Retinol: Which Anti Aging Powerhouse is Right for Pure & Cimple 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 The Science and Benefits of GHK Cu Peptide: Skincare, Hair Growth, and Beyond