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Tang H.J., Li W., Zhou M., et al., Design, Synthesis and Biological Evaluation of Novel Xanthine Oxidase Inhibitors Bearing a 2Arylbenzo[b]Furan Scaffold, European Journal of Medicinal Chemistry 151 (2018): 849860, 10.1016/j.ejmech.2018.01.096

If I had to guess, I would say it is a functionally inert string of amino acids with no real safety or efficacy signal at all

GHK-Cu doesn't play well with strong acids like L-ascorbic acid (the most common form of Vitamin C) or alpha-hydroxy acids (AHAs), as they can break the peptide bond and make it useless

All metabolites were normalized with total analyzed cell numbers for analysis

Brookmeyer R, Corrada MM, Curriero FC, Kawas C