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For GHK-Cu, where the cosmetic mechanism depends on copper ion delivery to fibroblast integrins that trigger TGF- signaling and collagen gene expression, that localized dermal concentration is the only variable that matters

In addition, these metabolic effects do not appear to be related to their diuretic action or intended pharmacological targets, raising concerns about the long-term metabolic impact of specific diuretics, particularly in vulnerable populations, including those with metabolic syndrome