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, The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Topical GHK Cu: Skin Benefits, Best Forms, and Where to Buy GHK Cu Peptide: Benefits for Tissue Repair, Healing, and Recovery Revolution Health & Wellness