How Does Retatrutide Work?
Last updated: January 2026
Quick Answer
Retatrutide is a 'triagonist' — it activates GLP-1 receptors (appetite, gastric emptying), GIP receptors (insulin sensitivity, fat metabolism), and glucagon receptors (energy expenditure, fat oxidation). The glucagon component is the key differentiator that may drive superior weight loss versus dual agonists.
How Does Retatrutide Work
Retatrutide is a 'triagonist' — it activates GLP-1 receptors (appetite, gastric emptying), GIP receptors (insulin sensitivity, fat metabolism), and glucagon receptors (energy expenditure, fat oxidation). The glucagon component is the key differentiator that may drive superior weight loss versus dual agonists.
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Related Questions
What is Retatrutide?
Retatrutide is Eli Lilly's next-generation weight loss drug in Phase 3 trials. It activates three receptors simultaneously (GLP-1, GIP, and glucagon), producing stronger weight loss than any currently approved medication. Phase 2 showed 24.2% average weight loss over 48 weeks.
How Does Tirzepatide Work Differently Than Semaglutide?
Tirzepatide activates two receptors (GLP-1 and GIP) while semaglutide activates only GLP-1. The dual mechanism provides stronger appetite suppression and better metabolic effects for most people.