Frontiers Biofunctionalization of hydrogel based scaffolds for vascular tissue regeneration GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? PDF) The effect of tripeptide copper complex on human hair growth in vitro Copper Tripeptide (GHK Cu) for Advanced Skincare & Haircare Formulatio GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Peptides for Hair Growth: promising, but not magic., Hair growth is not controlled by one single factor. It depends on the hair cycle, follicle health, blood supply, inflammation, hormones,