GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference Copper Peptide (GHK Cu) Serum Helloskin GHK Cu 1% Triple Peptide Regenerative Serum Ghk Cu Results Before And After