GHK Cu Cooper Peptide: The Complete Skin & Repair Guide (2026) GHK Cu, commonly known as copper peptides, are found naturally within the human body where they play a vital role in skin repair and maintenance. Copper peptides support optimal skin function by helping 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, GHK Cu Peptide Dosage How to Use Copper Peptides, Injections Neurogan Health