GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? As a skincare founder who has spent $1.3 million testing products and procedures on her own face, I've tried more peptides than I can count at this point. GHK Cu is the one GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms