Eli Lilly is going to court again over a weight loss drug that is not approved anywhere in the world. On October 8 the company filed five new lawsuits against businesses it says are selling retatrutide, its experimental obesity medicine, directly to consumers.
Who was sued
According to Buchanan Ingersoll & Rooney’s summary of the filings, the October defendants are three online retailers, American Peptides LLC, Cenexa Labs LLC and LiveWell Peptides, plus a weight loss clinic, MedShape Weight Loss Clinic, and a med spa, Southlake Mhya PLLC, doing business as Medrein Health & Aesthetics.
Lilly alleges the online sellers use “research use only” labels to disguise products meant for people to inject. It brings claims under the federal Lanham Act and state consumer protection and unfair competition laws, and is seeking injunctions, money damages and legal fees.
The suits follow six others Lilly filed in August against med spas, a compounding pharmacy and online sellers in California and Texas.
What retatrutide is, and is not
Retatrutide is an investigational drug that acts on three hormone receptors involved in appetite and metabolism. It is still in Phase 3 clinical trials. Lilly says no retatrutide medicine has been approved for human use by any regulator.
That means anything sold as retatrutide today did not come from Lilly, has not been reviewed for safety or purity, and has no approved dose. The FDA has warned consumers not to buy these products, which it describes as being of unknown quality and possibly harmful.
In August Lilly also said it had referred more than 200 people and businesses to regulators and law enforcement, and reported more than 14,000 websites, ads, social media posts and product listings.
Why “research use only” is a red flag
The research-peptide market has grown alongside demand for GLP-1 medicines. Sellers often post the words “not for human consumption” next to dosing charts and injection guides. Connecticut’s attorney general has also acted this year against an online platform and a med spa over bootleg and unapproved weight loss drugs.
What to look for instead
Any legitimate weight loss treatment, from an approved brand or a state-licensed pharmacy, starts with a licensed clinician reviewing your health history and writing a prescription. The medication is dispensed by a licensed pharmacy and comes with instructions from your care team.
If a website offers you an unapproved drug with no prescription, no clinician and a “research” disclaimer, it is not a shortcut. Walk away.
Photo: Eli Lilly and Company Corporate Center in Indianapolis. Momoneymoproblemz via Wikimedia Commons, CC BY-SA 4.0.
Sources
- Buchanan Ingersoll & Rooney: Eli Lilly’s Retatrutide Lawsuits: What Pharmacies, Telemedicine Companies and Online Retailers Need to Know
- The Washington Post: Health Brief: Eli Lilly takes on retatrutide copycats (Oct. 9, 2026)
- Healio: Eli Lilly files lawsuits against six companies for allegedly selling retatrutide (Aug. 14, 2026)
- American Pharmaceutical Review: Lilly Sues Six Sellers, Urges Crackdown on Illegal Retatrutide Market
- Connecticut Attorney General: Online platform to cease bootleg weight loss drug sales
See what a Living+ plan costs and whether it fits.
