GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Copper Peptide Hair Growth Serum AHK Cu & GHK Cu + Licorice Peptide Labz GHK Cu for Hair Growth? It Works But Only If You Do It Right. Everyone's talking about GHK Cu, but here's the catch most serums never make it past your scalp barrier. GHK Cu Hair Growth GHK Copper Peptide GHK Cu Tripeptide 1