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 In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit Copper peptide GHK Cu Wikipedia