GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Thrive Copper Peptide Serum Skin Barrier Support & Hydration 29ml 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 SumaNurica GHK Cu Repairing Serum 30ml MYER 7% GHK CU ACCELERANT Platinum Skin Care