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A clinically meaningful pharmacokinetic interaction would require GHK-Cu to inhibit OCT1, OCT2, or MATE transporters

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Their work includes chronic dosing studies extending to 6 weeks, comprehensive tissue examination at necropsy, and genetic toxicology assessment using standardized protocols accepted by regulatory agencies worldwide

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That distinction matters in a category where "copper peptide" is increasingly used as a marketing term rather than as proof of potency