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Topical vs Injectable Tolerability Topical GHK-Cu appears better tolerated than injectable forms, with topical side effects typically limited to mild redness, itching, or irritation at application site and rare “copper uglies” phenomenon (anecdotal accelerated skin aging appearance due to potential MMP upregulation, not well-studied)

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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 μM over 72 hours and did NOT induce inflammatory biomarkers (IL-1α, IL-8, HSPA1A, FOSL1) unlike other copper compounds, concluding GHK-Cu has a low potential of inducing skin irritation