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Tchantchou F, Zhang Y

GHK-Cu has been shown to regulate over 4,000 human genes in research settings, including upregulation of tissue repair genes and downregulation of genes associated with inflammatory and oxidative damage pathways

PubMedPMC 67

N., & Antonio, J

There are anecdotal horror stories from those who purchase gray market GHK-Cu (which can cost about $50 for a months supply) and inject at home only to experience whats been dubbed the copper uglies, where your skin suddenly looks dramatically worse, as if rapidly aging instead of looking younger, like the villain who choose poorly at the end of Indiana Jones and the Last Crusade