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 Advanced GHK Cu Copper Peptide Serum 1% (300mg 30 ml (Pack of 1) Copper Peptides Ingredient Guide Nubeean Noosa Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000