Copper Peptide Hair Growth Serum 10% GHK Cu & 5% AHK Cu Hairgenetix GHK Copper Peptide GHK Cu Tripeptide 1 AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan Think of it like building a foundation for your hair. Jeff explains how we use GHK Copper peptides and biologics to give follicles exactly what they need to thrive. It is a more Copper Peptide Hair Growth Serum (GHK Cu & AHK Cu)