GHK Cu: Effective Anti Aging Skincare Ingredient Nugenyx 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, Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs GHK CU Copper Peptide Face Serum Robyn's Tack Room ROBYN'S TACK ROOM