GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy 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, Should Bodybuilders Take GHK Cu? Neurogan Health GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B