Peptide Deep Dives:GHK Cu vs AHK Cu: Copper Peptides That Rebuild Ski GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper Peptide Hair Growth Serum (10% GHK Cu + 5% AHK Cu) 30ml ROBYN'S TACK ROOM Youve heard of GHK Cu., We didnt stop there., Our formula pairs GHK Cu with its bigger, more targeted brother AHK Cu., GHK Cu helps support follicle health and strand strength., AHK Cu has been Ingredients Hairgenetix GHK Cu, AHK Cu & PDRN Peptides