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 Food Derived TripeptideCopper Self Healing Hydrogel for Infected Wound Healing Biomaterials Research The Benefits & Risks of GHK Cu (WATCH BEFORE TAKING)