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GHK-Cu should be avoided during pregnancy or breastfeeding, in active cancer or untreated solid tumors, in Wilson's disease or other copper-handling disorders, and in known copper allergy

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Investigations comparing topical GHK-Cu with common dermatologic comparators reported indications of higher dermal procollagen, along with observations consistent with thicker and more elastic skin architecture over multi-week intervals

The research tells a completely different story, one where nanomolar concentrations outperform percentage-based thinking and where the sweet spot sits far lower than most product labels suggest