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- By Timothy Brown
- 03 Sep 2026
An underground market for unlicensed slimming drugs is propelled by social media fitness personalities and vendors on communication apps, based on new investigations.
Retatrutide, which remains in research studies, is being advertised by social media influencers for its supposed fat-burning properties. Viewers are encouraged to contact these profiles privately for source information, while also receiving promotional offers.
Additionally, a robust market exists on messaging services, where groups with thousands of participants share comparison photos, injection guides and claims of next-day UK delivery. Sellers market the substance there before directing buyers to other platforms for purchases.
Retatrutide is an investigational injectable created by US drugmaker Eli Lilly. The drug targets three intestinal hormones – GLP-1, GIP and glucagon. Preliminary studies indicate it could help patients reduce up to a quarter of their body weight. Nicknamed the “triple G”, the drug is being hailed online as the next Ozempic.
However, doctors and pharmacists have cautions that the sale of what remains an unlicensed medication in the UK is a cause for concern and could lead to individuals injecting substances of unknown origin.
Several professionals said the demand for retatrutide could be connected to the increasing price of licensed weight loss products such as Mounjaro.
Marketing retatrutide on social media or messaging apps is prohibited in the UK, as it is an unlicensed medication that must not be promoted or supplied for personal consumption under the Human Medicines Regulations 2012.
Some content creators attempt to sidestep the rules by calling to the substance as a “research chemical” or citing it as “not for human consumption”. Retatrutide is not a restricted substance, but promotion and supply can still breach medicines, marketing, and customer regulations, risking fines, legal action or prison.
According to the social media company, the platform has taken down violative material and banned associated keywords and search suggestions. The organization stated it was committed to maintaining the platform secure and investing in strengthening enforcement strategies.
Research also found communities with up to nine thousand participants marketing the experimental drug using the platform's built-in discovery tool, which operates like a public directory. Typing “retatrutide” instantly brings up channels with thousands of users, filled with images of weight loss, positive testimonials and detailed guides for mixing or injecting at home.
Within minutes of entering one group, a vendor shared contact information, where most transactions take place. The seller sent an guidebook and guaranteed shipping within 48 hours. When questioned whether the substance was genuine, one vendor said: “You can’t be sure.” Another provided a image of a supposed laboratory certificate. None asked about body mass, health issues or past usage.
Inside these groups, messages display black plastic parcels with postal service stickers, claiming to include fresh supplies. One message stated: “It took eight of us to load them this morning.”
Buyers can select between dry substance containers, prepared at home with purified liquid, or ready-to-use injectors usually priced at 160 pounds for 20mg. When asked how long a injector should last, vendors give conflicting answers ranging from a few weeks to “depends on your body”.
A representative for the messaging service said it regularly monitored harmful content on its service including material that encouraged the “misuse of controlled medications”. The organization noted that it removed “millions of pieces of harmful content each day”.
“People are injecting substances they can’t verify. Even if the research behind retatrutide is sound, these digital products may not include what they claim,” said Jason Murphy, the head of pharmaceutical services at a pharmacy service.
Dr Crystal Wyllie of Asda Online Doctor connected the increase in demand to recent price rises for approved weight-loss drugs such as Mounjaro. “With prices rising, individuals are turning to social media. But counterfeit treatments are highly dangerous. You cannot know what’s inside or whether the environment they were made in was clean,” she explained.
Her team has already seen patients harmed by personal administration from unconfirmed suppliers. “We understand the frustration, but buying from messaging apps or WhatsApp is gambling with your well-being,” stated Wyllie. “These substances could be contaminated or improperly measured.”
A spokesperson from the pharmaceutical company said retatrutide was in phase 3 research studies and had not been evaluated or authorized by any government authority anywhere in the world. “Therefore at this time no one can market [it] for personal consumption,” they said, noting that any product “misleadingly claiming itself as a company experimental product not yet approved … may expose users to possibly significant medical dangers”.
Maya is a seasoned travel writer with a passion for uncovering exclusive destinations and sharing practical tips for luxury travelers.