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That is the evidence gap, stated plainly: the mechanism is well-motivated and the preclinical signal is consistent, but no human study has confirmed that any of it translates to people, at any dose, by any route

[DOI] [PubMed] [Google Scholar] 101.Zamorskii I.I., Shchudrova T.S., Zeleniuk V.G., Linkova N.S., Nichik T.E., Khavinson V.K

Early-phase and preclinical data suggest that glucagon receptor activation may increase energy expenditure and promote hepatic fat reduction, though the clinical significance of these effects in humans is still being evaluated

Diet alone cannot prevent the muscle loss that slows metabolism

Like most skincare actives, GHK-Cu works gradually with regular use rather than overnight