What Is Retatrutide? A Research Overview

Retatrutide is an investigational triple GIP/GLP-1/glucagon receptor agonist — a single peptide engineered to bind three metabolic hormone receptors at once. It is currently in clinical trials and is not approved by the FDA for any use. Material offered here is sold strictly for research use only (RUO) and is not for human or veterinary use.

Quick facts

• Class: triple GIP/GLP-1/glucagon receptor agonist (single-molecule)
• Status: investigational — under evaluation in clinical trials, not FDA-approved
• Research focus: metabolic research
• Identifier: also referenced in the literature as LY3437943
• Form: lyophilized powder, ≥99% HPLC purity, third-party tested

What is Retatrutide?

Retatrutide is a synthetic peptide designed as a single molecule that activates three distinct receptors involved in metabolic signaling: the glucose-dependent insulinotropic polypeptide (GIP) receptor, the glucagon-like peptide-1 (GLP-1) receptor, and the glucagon (GCG) receptor. This “triple agonist” approach distinguishes it from single-receptor and dual-receptor peptides that have been characterized in earlier metabolic research. In published reports, retatrutide is conjugated to a fatty diacid moiety, a structural feature associated with extended circulation in study models. Because retatrutide remains an investigational compound, any material supplied is intended solely for in–vitro and laboratory research, not for consumption.

What does the research show?

Retatrutide has been examined in several peer-reviewed, randomized phase 2 studies. It is important to note that these are clinical-research findings in investigational settings — the compound is not approved, and the results below describe what was observed in trials, not outcomes for any reader.

In a phase 2 obesity trial published in the New England Journal of Medicine, retatrutide was studied across multiple dose levels in adults and reported as generally tolerated, with transient, mostly mild-to-moderate gastrointestinal events noted during dose escalation [1]. A separate phase 2 trial in people with type 2 diabetes, published in The Lancet, evaluated its effects on glycemic measures [2]. A phase 2a substudy in Nature Medicine investigated retatrutide in participants with metabolic dysfunction-associated steatotic liver disease (MASLD), reporting reductions in liver-fat content as measured by imaging [3]. Across these publications, retatrutide remains classified as investigational and continues to be studied in ongoing trials.

Mechanisms studied in the lab

• GIP receptor: an incretin pathway implicated in insulin secretion and nutrient signaling in research models.
• GLP-1 receptor: an incretin pathway widely studied for its role in glucose-dependent insulin response and appetite signaling.
• Glucagon (GCG) receptor: a pathway studied in connection with hepatic glucose handling and energy expenditure in preclinical research.

The scientific interest in retatrutide lies in engaging all three pathways simultaneously within a single molecule, which researchers study to compare against mono- and dual-receptor agonists.

Research status and safety

Retatrutide is an investigational compound that has not completed regulatory review and is not FDA-approved for any indication. Products described on this page are research-use-only reference materials intended for qualified laboratory professionals. They are not for human or veterinary use, not for diagnostic or therapeutic use, and not to be consumed. Any handler should follow standard laboratory safety practices, applicable institutional guidelines, and local regulations. Nothing here should be interpreted as medical guidance or as a claim of benefit for any person.

Handling

Retatrutide reference material is supplied as a lyophilized (freeze-dried) powder for laboratory use. Lyophilized peptides are typically stored cold and protected from light per the product documentation. For general laboratory procedure, see our guide on how to reconstitute a research peptide, and browse related GLP research peptides. Product details and specifications are available here: Retatrutide — research-grade, ≥99% pure, third-party tested.

FAQ

How does retatrutide differ from semaglutide and tirzepatide? In the research literature, semaglutide is characterized as a single GLP-1 receptor agonist and tirzepatide as a dual GIP/GLP-1 receptor agonist. Retatrutide is described as a triple agonist, adding glucagon (GCG) receptor activity to the GIP and GLP-1 targets.

Is retatrutide approved or available as a medicine? No. It is an investigational compound still in clinical trials and is not FDA-approved. Material sold here is for research use only.

What does “triple agonist” mean? It means one peptide molecule is engineered to activate three different receptors — GIP, GLP-1, and glucagon — rather than just one or two.

References

1. Jastreboff AM, Kaplan LM, Frías JP, et al. Triple-Hormone-Receptor Agonist Retatrutide for Obesity — A Phase 2 Trial. N Engl J Med. 2023;389(6):514–526. PubMed 37366315
2. Rosenstock J, Frías J, Jastreboff AM, et al. Retatrutide for people with type 2 diabetes: a phase 2 trial. Lancet. 2023;402(10401):529–544. PubMed 37385280
3. Sanyal AJ, et al. Triple hormone receptor agonist retatrutide for MASLD: a phase 2a trial. Nat Med. 2024;30(7):2037–2048. PMC11271400

For research use only. Not for human or veterinary use. Statements have not been evaluated by the FDA.