GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link GHK CU Crepey Skin Escape Skin Care Peptide Innovation: GHK Cu Cellgenic GHK Cu: My secret weapon for skin, hair, and healing I use it two ways topical cream for my face, and subQ injections 3x a week. It boosts collagen, tightens skin, helps