Expression and Purification of Recombinant GHK Tripeptides Are Able to Protect against Acute Cardiotoxicity from Exposure to Waterborne Copper in Zebrafish GHK Cu: The Copper Peptide And The Claims Around It, GHK Cu is a naturally occurring copper binding tripeptide found in human plasma. Mechanistically, its linked to tissue repair signaling, immune Paracrine inhibition via G protein inwardly rectifying potassium channels regulates glucagon secretion from human pancreatic alp Relief of ovalbumin induced airway remodeling by the glycyl l histidyl l lysine Cu2+ tripeptide complex via activation of SIRT1 in airway epithelial cells ScienceDirect