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What does glucagon do in retatrutide?

Retatrutide activates the glucagon receptor in addition to GLP-1 and GIP receptors; reviews credit glucagon with fat breakdown, lower food intake and, at least in animal models, higher energy expenditure.

GLP-1 / GIP / glucagon triple agonistUpdated

Short answer

Retatrutide activates the glucagon receptor in addition to GLP-1 and GIP receptors; reviews credit glucagon with fat breakdown, lower food intake and, at least in animal models, higher energy expenditure.[1]

What the sources show

In primary human liver cells, both glucagon and retatrutide lowered secretion of the ANGPTL3/8 complex, and blocking the glucagon receptor reversed that.[2]

The authors suggest glucagon-receptor activity could lower circulating ANGPTL3/8, which may help explain falls in triglycerides and LDL cholesterol.[2]

Because glucagon raises blood sugar, the glucagon-active drugs in this review also activate the GLP-1 receptor, which stimulates insulin release.[1]

The review says glucagon's role in energy regulation and lipid metabolism will become clearer as safety and efficacy data emerge.[1]

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More on Retatrutide

How it worksTarget, mechanism and how long it acts, from the label or studies.Retatrutide overview

Sources

  1. 1Shared mechanistic pathways of glucagon signalling: Unlocking its potential for treating obesity, metabolic dysfunction-associated steatotic liver disease, and other cardio-kidney-metabolic conditions.Diabetes, obesity & metabolism · 2025PMID 41025406Accessed 2 Oct 2026
  2. 2Decreases in circulating ANGPTL3/8 concentrations following retatrutide treatment parallel reductions in serum lipids.Diabetes, obesity & metabolism · 2025PMID 40726454Accessed 2 Oct 2026

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