GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Copper peptides like GHK Cu work by sending signals to your skin to repair, regenerate, and produce collagen. It's not about instant results, it's about improving how your skin functions over time. Dr. GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link GHK Cu Peptide Rescues Aging Cognition but Splits Molecular Pathways in the Brain News Rapamycin Longevity News