GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link NL GHK Cu in the nervous system Synthagen PL Figure 2. [Growth hormone binding to the]. Endotext NCBI Bookshelf Injectable GHK Cu: Beginner's Guide to Copper Peptide Thermodynamically stable ionic liquid microemulsions pioneer pathways for topical delivery and peptide application ScienceDirect