What Does Glucagon Do in Retatrutide? Triple Agonist Explained

What glucagon does in retatrutide is central to understanding why this investigational triple receptor agonist may represent a significant advance in metabolic medicine. Retatrutide simultaneously activates GLP-1, GIP, and glucagon receptors — a combination not seen in any currently licensed UK medicine. Whilst glucagon is traditionally associated with raising blood glucose, its role in retatrutide is carefully balanced by the insulin-stimulating effects of GLP-1 and GIP, with the aim of harnessing glucagon's metabolic properties — including potential increases in energy expenditure and hepatic fat reduction — without causing harmful hyperglycaemia. Retatrutide remains under clinical investigation and is not yet approved by the MHRA or EMA.

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