GHK Cu Copper Peptide Serum Private Label Skin Repair A lot of people asked how I use GHK Cu (copper peptide) with a pen device, so here's a quick tutorial showing exactly how I do it. In this video I show how USA Copper Peptide GHK Cu Powder, DIY Blue Copper for Making the Best Face Cream GHK Cu Copper Peptide HPLC Tested Peptide Warehouse GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B GHK Cu Peptide Injections: The Future Of Skin And Hair Care