Copper Peptide (GHK Cu) Serum GHK Cu 50mg Dosage Protocol PeptideDosages.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 GHK Cu Side Effects, Complications, and Risk Profile Copper peptide questions we get asked all the time How often should you use it? Do you need to avoid the sun? If you're new, start once daily (evenings are great),