GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Theoretical study of copper binding to GHK peptide ScienceDirect Site Specific Detection of CopperPeptide Coordination in Solution Phase by Two Dimensional Infrared Spectroscopy The Journal of Physical Chemistry Letters Is Less More? Influence of the Coordination Geometry of Copper(II) Picolinate Chelate Complexes on Metabolic Stability Inorganic Chemistry