GHK Cu Copper Peptide Hair & Scalp Serum YanaSecrets GHK CU Regenrative and Protective Agent Peptides World Simple Peptide GHK CU 100MG Amerikasepetim Medically Guided Hair Treatment Rumen Australia Hair Growth Serum Intense with Copper Peptide GHK Cu 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.