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, Subcutaneous Injection Sites and Instructions for Safe Self Administration GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Subcutaneous Injection Sites and Instructions for Safe Self Administration GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy