GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Peptide Therapy for Pain Management and Healing Core Medical & Wellness Subcutaneous Injection Sites and Instructions for Safe Self Administration 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,