Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 Copper Peptide Regenerating Serum for Glowing Skin and Hair GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Not all Copper Peptides are created equal If you've tried copper peptides before and saw no change, here is why: Concentration and Stability. Most serums use a diluted solution that barely scratches