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), Using GHK CU for Acne and Scarring Treatment SumaNurica GHK Cu Repairing Serum 30ml MYER Peptide GHK CU Cream Concierge MD How long will a 50 mg supply of GHKCu last when dosing 2 mg daily for five consecutive days followed by two days off each week?