What Is Retatrutide?
Retatrutide is an investigational weight loss medication from Eli Lilly. It is often called a “triple agonist” because it acts on three hormone receptors: GLP-1, GIP and glucagon.
Semaglutide works on one of these (GLP-1). Tirzepatide works on two (GLP-1 and GIP). Retatrutide adds glucagon, which researchers believe may help the body burn more energy and reduce liver fat.
Is Retatrutide FDA Approved?
No. As of November 2026, retatrutide is not FDA approved for weight loss or any other use. It is still being studied in Lilly’s Phase 3 TRIUMPH clinical trial program.
That means there is no brand-name retatrutide product at pharmacies yet, and no approved prescription pathway outside of clinical trials.
What Have the Studies Shown?
In the Phase 2 trial published in the New England Journal of Medicine in 2023, people on the highest dose lost an average of about 24% of their body weight after 48 weeks. That was more than most people had seen in earlier trials of other GLP-1 medications.
In 2026, Lilly began reporting topline Phase 3 results and said it is moving toward an FDA filing. The full results will be reviewed by the FDA before any decision.
Side effects in studies were similar to other GLP-1 medications: nausea, diarrhea, constipation and reduced appetite, mostly during dose increases. Researchers are also watching reports of skin sensitivity (dysesthesia) at higher doses.
When Could Retatrutide Be Available?
No approval date has been set. After a company files, a standard FDA review takes about 10 months and a priority review about 6 months. Most current estimates place a possible decision sometime in 2027.
Even after approval, new obesity medications often have limited supply for the first several months.
A Warning About “Research Peptide” Retatrutide
You may see retatrutide sold online as a “research peptide” or “not for human use.” These products are not FDA approved. Their purity, dose and safety are unknown, and they have not gone through the testing that approved medications must pass.
If you are interested in retatrutide, talk with a licensed medical provider instead of buying products online.
Should You Wait for Retatrutide?
For most people, waiting is not necessary. Semaglutide and tirzepatide are available now, have years of safety data and produce meaningful weight loss. Starting now also lets you build habits like eating enough protein and strength training, which matter with any medication. Learn more in how tirzepatide works.
If retatrutide is approved later, your provider can talk with you about whether switching makes sense.
Frequently Asked Questions
Is retatrutide stronger than tirzepatide?
In early trials, retatrutide produced more weight loss on average. No head-to-head trial has been completed yet.
Can I get retatrutide in Riverside today?
Not as an FDA-approved medication. It is only available through clinical trials.
What can I take instead?
Semaglutide or tirzepatide, prescribed and monitored by a medical provider.
Start Your Weight Loss Journey Now
At Allure Medical Weight Control & Wellness in Riverside, our team can help you find out if semaglutide or tirzepatide is right for you. Book a consultation or visit our retatrutide information page.
This article is for educational purposes and is not medical advice. Talk with your healthcare provider before starting or changing any medication.
Featured image: Magnific.