Expression and Purification of Recombinant GHK Tripeptides Are Able to Protect against Acute Cardiotoxicity from Exposure to Waterborne Copper in Zebrafish GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link