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 Peptides Serum for Face 2% GHK CU & 4% EGF Seraphime GHK Cu Peptide The benefits, side effects, and more [2026] Copper Peptides for Skin: A Complete Guide GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack?