GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Cosmecell GHK CU Super Facial Sunscreen SPF 50 PA++++: The Copper Pept GHK Cu Copper Peptide Hair Growth Serum Blackbird Skincare: Custom Skincare & Beauty Manufacturer Tailored Solutions for Every Brand 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,