Injectable GHK Cu: Beginner's Guide to Copper Peptide GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B GHK Cu Dosage Calculator Draw Volume In ML & U 100 Units The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, GHK Cu Copper Peptide Serum Private Label Skin Repair