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 Platinum Skin Care Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Dimeric copper peptide incorporated hydrogel for promoting diabetic wound healing Nature Communications