Expression and Purification of Recombinant GHK Tripeptides Are Able to Protect against Acute Cardiotoxicity from Exposure to Waterborne Copper in Zebrafish The tripeptide GHKCu complex ameliorates lipopolysaccharideinduced acute lung injury in mice Oncotarget Effects of Copper Tripeptide on the Growth and Expression of Growth Factors by Normal and Irradiated Fibroblasts Jeffrey D. Pollard, Susan Quan, Thomas Kang, R. James Koch, 2005 GHK Cu Peptide Progress: Week 3 Results The FDA is now reconsidering 12 peptides it previously placed in Category 2, a designation that blocks compounding pharmacies from producing them. The reasoning centers on safety concerns and limited data, but