GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Squalane + Copper Peptide (GHK Cu) Rapid Plumping Serum How to avoid the GHK CU copper uglies GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B GHK Cu (copper peptide) used topically is one of the most well studied skin repair peptides. Heres how it helps the skin, in practical terms:, 1. Boosts collagen & elastin, GHK Cu signals your skin