Copper Peptides Serum for Face 2% GHK CU & 4% EGF Seraphime Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 GHK Cu Organic Serum Copper Peptide for Anti Aging & Skin Repair GHK Copper Peptide GHK Cu Tripeptide 1 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,