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      learn GHK-Cu

      • GHK-Cu: Does it have side effects or is it completely safe? For topical cosmetic use, one 24-hour study in cultured skin cells found a low potential for irritation, but no clinical trial has characterised its side effects on the scalp. Injected or oral GHK-Cu has no published human safety data, and the FDA lists injectable GHK-Cu among compounding substances that may present significant safety risks.