Skin Perfection GHK Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz Walmart.com R 10% Ghk Cu + 5% Ahk Cu Copper Peptide Hair Density 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 Copper Peptide Hair Growth Serum 10% GHK Cu & 5% AHK Cu Hairgenetix