A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu and Its Roles in Skin and Hair Transformation Scientific Research: Microneedling for Hair Growth Hairgenetix AHK Cu (Copper Tripeptide 3) Ingredient Guide Nubeean Noosa Micro needling GHK Cu to regrown my hair. Im going to stab small needles coated in liquid GHK cu, into my head twice a week. Fallow along to see if my hair will grown back. #ghkcu #microneedling