Copper Peptide (GHK Cu) 2% Recovery Serum GHK Cu Peptide The benefits, side effects, and more [2026] 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, Cosmecell GHK CU Super Facial Sunscreen SPF 50 PA++++: The Copper Pept GHK Cu Copper Peptide Serum 1% Black Tie Health Wholesale AHK CU + GHK CU Hair Serum Pro for your store Faire