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What Is Retatrutide (Reta)?
Retatrutide, sometimes called Reta, is an investigational medicine being studied for obesity and type 2 diabetes. This guide explains how it works, what Phase 3 weight loss trials measure and how to interpret claims about results and side effects.
Browse the ShopHow Does Retatrutide Work?
Retatrutide acts on three receptors involved in metabolism: GIP, GLP-1 and glucagon. That is why clinical researchers call it a triple receptor agonist.
Retatrutide and Weight Loss Research
The TRIUMPH clinical trial programme studies retatrutide in defined patient groups, including adults with obesity or overweight. When comparing results, check who participated, what the trial compared and how long people were followed.
Is Retatrutide Approved?
As of November 2026, retatrutide remains investigational. Phase 3 results are part of the evidence regulators review when considering approval for a specific medical use.
Retatrutide Side Effects and Safety
Clinical trials collect information about adverse effects, including digestive symptoms. To understand what the results mean, compare how often each event occurred in the treatment and comparison groups and how many participants stopped treatment.
Frequently Asked Questions
What does Reta mean?
Reta is an informal name for retatrutide. The name LY3437943 also appears in clinical trial records.
Is retatrutide the same as semaglutide?
Retatrutide acts on GIP, GLP-1 and glucagon receptors. Semaglutide acts on the GLP-1 receptor. Each medicine has its own clinical evidence and regulatory status.
Does weight loss in a trial mean fat loss?
Total body weight and body fat are different measurements. Check whether the study reported body composition as well as the change in weight on the scale.