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A Nature Scientific Reports 2016 study showed GHK-Cu had no cytotoxicity to human keratinocytes at concentrations up to 5,800 M over 72 hours and did NOT induce inflammatory biomarkers (IL-1, IL-8, HSPA1A, FOSL1) unlike other copper compounds, concluding GHK-Cu has a low potential of inducing skin irritation

They tended to have misspelled words or odd wording on the labels and cost significantly less than the typical price

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doi: 10.1016/j.ogc.2012.10.002 39

Read the full study: Effect of intra-articular injection of AOD9604 with or without hyaluronic acid in rabbit osteoarthritis model (Ann Clin Lab Sci 2015)