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- By Lisa Wright
- 09 Sep 2026
A shadow economy for unapproved slimming medications is being driven by TikTok fitness influencers and vendors on messaging platforms, according to recent findings.
The experimental drug, which remains in clinical trials, is being advertised by online personalities for its supposed weight-reducing effects. Viewers are urged to contact these accounts privately for supplier links, while also obtaining discount codes.
Additionally, a flourishing market exists on messaging services, where communities with thousands of participants share comparison images, injection guides and claims of rapid British shipping. Sellers promote the drug there before directing customers to other platforms for transactions.
Retatrutide is an investigational injectable created by US drugmaker Eli Lilly. The treatment targets three gut hormones – glucagon-like peptide-1, glucose-dependent insulinotropic polypeptide and glucagon. Preliminary studies suggest it could assist patients lose up to a quarter of their total weight. Nicknamed the “triple G”, the substance is being promoted online as the successor to Ozempic.
Nevertheless, doctors and pharmacists have warned that the sale of what is still an unapproved medication in the UK is a cause for concern and could result in users injecting substances of uncertain source.
Some experts said the popularity for the experimental drug could be linked to the rising cost of licensed slimming products such as Mounjaro.
Selling retatrutide on social media or Telegram is prohibited in the UK, as it is an unlicensed drug that must not be marketed or distributed for human use under the British medical regulations.
Several content creators attempt to circumvent the rules by calling to the substance as a “research chemical” or describing it as “not for human consumption”. Retatrutide is not a restricted substance, but advertising and distribution can still breach medicines, advertising, and consumer laws, risking penalties, prosecution or prison.
Based on the social media company, the service has taken down problematic material and banned associated keywords and search suggestions. The organization stated it was committed to keeping the service secure and investing in enhancing compliance measures.
Research also discovered groups with up to nine thousand members marketing retatrutide using Telegram's integrated discovery tool, which operates like a online catalog. Typing “retatrutide” immediately brings up channels with thousands of members, populated with images of slimming results, glowing testimonials and detailed instructions for preparing or administering at residence.
Within minutes of entering one group, a vendor posted contact information, where the majority of transactions take place. The seller provided an instruction manual and promised shipping within two days. When questioned whether the product was authentic, one seller responded: “You can’t be sure.” Another shared a photo of a alleged testing documentation. None inquired about body mass, health issues or previous experience.
Within these communities, posts display black plastic parcels with postal service labels, claiming to include fresh supplies. One message stated: “It took eight of us to load them this morning.”
Customers can select between dry substance containers, prepared at home with purified liquid, or pre-filled pens usually sold at £160 for 20 milligrams. When asked how long a injector should last, sellers give contradictory answers varying between a several days to “depends on your body”.
A spokesperson for the messaging service said it regularly moderated dangerous content on its platform including material that promoted the “misuse of controlled medications”. The company added that it eliminated “millions of pieces of harmful content each day”.
“People are injecting substances they cannot confirm. Even if the research behind this drug is sound, these digital versions may not contain what they advertise,” stated Jason Murphy, the head of pharmaceutical services at a pharmacy service.
A medical professional of Asda Online Doctor connected the increase in demand to recent cost increases for authorized slimming medications such as Mounjaro. “With prices rising, individuals are turning to social media. But fake treatments are highly risky. You cannot know what’s inside or whether the environment they were produced in was clean,” she explained.
Her team has previously seen individuals injured by self-injection from unconfirmed suppliers. “We understand the frustration, but purchasing from Telegram or WhatsApp is gambling with your well-being,” said Wyllie. “These materials could be contaminated or improperly measured.”
A spokesperson from Eli Lilly stated the substance was in phase 3 clinical trials and had not been reviewed or approved by any government authority anywhere in the world. “Therefore at this point no one can sell [it] for human use,” they said, adding that any product “misleadingly claiming itself as a company investigational product not yet approved … may subject users to potentially serious health risks”.