The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK Cu Peptides: Unlocking the Copper Peptide Revolution in Skin Care GHK Cu Copper Peptide for Hair Loss: Results, Mechanism, and What to Expect GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link