GHK Cu Copper Peptide Skincare Bundle RegenMed Direct AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan GHK Cu Peptide Hair Growth GHK CU 100mg Cellgenic 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 Natural Copper Peptide Serum Booster