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A 2016 comparative study published in Nature Scientific Reports demonstrated that GHK-Cu produced no cytotoxicity to human keratinocytes at concentrations up to 5,800 micromolar over 72 hours and did not induce inflammatory biomarkers, unlike other copper compounds tested alongside it

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The most defensible reading is to treat each compounds own within-trial data as its evidence and to treat any cross-compound ranking as a hypothesis, not a result

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This anti-aging peptide is a powerful complex of glycine, histidine, and lysine bound to a copper ion (Cu), vital for cellular signaling and repair