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, Peptide Injections: What They Are, What They Promise, and the Big Unknowns Amazon.com: Ewecxine GHK Cu Copper Peptide Supplement, 300 mcg per Serving, Liposomal Formula, 100 Vegan Capsules Beauty Support Matrix with Biotin, Phytoceramides & Herbal Blend : Health & Household GHK Cu Skin Cream Proven Collagen & Anti Aging, $279