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The MHRA determines whether a product is a medicine on a case-by-case basis
Shim JA, Son YA, Park JM, Kim MK
Suitable for all skin types, including sensitive skin
Low zinc, poor ceruloplasmin production or impaired biliary copper excretion may worsen copper-related oxidative stress
Relative contraindications requiring caution include active or suspected cancer (GHK-Cu promotes angiogenesis with concern about theoretically feeding tumors, though conflicting data shows documented anti-cancer gene expression effects requiring medical supervision), severe organ dysfunction (kidney or liver failure may slow peptide clearance), hemochromatosis or copper overload conditions, autoimmune disorders, and patients on immunosuppressants or blood thinners
