GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link Frontiers Opioid receptor desensitization: mechanisms and its link to tolerance GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not Advances in Peptide Based Chimeric Strategies for Targeted Protein Degradation Journal of Medicinal Chemistry