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- By Kayla Rogers
- 02 Sep 2026
An underground market for unapproved weight-loss drugs is being driven by TikTok fitness influencers and sellers on communication apps, according to recent findings.
The experimental drug, which remains in clinical trials, is being promoted by social media influencers for its supposed fat-burning properties. Viewers are urged to contact these accounts privately for supplier links, while also receiving promotional offers.
Separately, a flourishing trade exists on Telegram, where groups with numerous of members share “before and after” photos, injection guides and claims of next-day British shipping. Vendors promote the substance there before directing customers to WhatsApp for transactions.
This medication is an experimental injectable developed by American pharmaceutical company Eli Lilly. The treatment affects three gut hormones – glucagon-like peptide-1, glucose-dependent insulinotropic polypeptide and pancreatic hormone. Preliminary studies suggest it could help patients reduce up to a quarter of their body weight. Referred to as the “triple G”, the substance is being hailed online as the next Ozempic.
Nevertheless, physicians and chemists 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 products of unknown origin.
Several professionals said the popularity for retatrutide could be linked to the increasing price of licensed weight loss products such as Mounjaro.
Selling the unapproved drug on social media or messaging apps is prohibited in the UK, as it is an unapproved medication that cannot be marketed or supplied for human use under the Human Medicines Regulations 2012.
Some influencers attempt to circumvent the rules by calling to the drug as a “research chemical” or describing it as “not for human consumption”. The substance is not a restricted substance, but advertising and distribution can still breach pharmaceutical, marketing, and customer laws, risking penalties, legal action or prison.
According to the social media company, the platform has removed violative material and banned related keywords and search suggestions. The organization stated it was committed to maintaining the service secure and allocating resources in strengthening compliance measures.
Investigations also discovered communities with up to 9,000 members selling the experimental drug using Telegram's built-in search feature, which functions like a public directory. Typing “retatrutide” instantly brings up channels with numerous of members, populated with images of slimming results, glowing reviews and detailed instructions for mixing or administering at home.
Within minutes of entering one group, a vendor posted contact information, where most purchases take place. The vendor provided an guidebook and guaranteed delivery within two days. When questioned whether the product was authentic, one seller responded: “You can’t be sure.” Another provided a photo of a alleged testing documentation. Not one inquired about body mass, health issues or past usage.
Within these communities, messages display dark colored parcels with postal service labels, claiming to include fresh supplies. One communication read: “It took eight of us to load them this morning.”
Buyers can select between dry substance containers, mixed at home with sterile water, or ready-to-use pens usually priced at 160 pounds for 20mg. When questioned how long a injector should be used, sellers give contradictory responses varying between a few weeks to “depends on your body”.
A representative for Telegram stated it regularly moderated harmful material on its service including content that promoted the “misuse of controlled medications”. The organization noted that it eliminated “millions of pieces of harmful content each day”.
“Individuals are administering substances they cannot confirm. Even if the science behind this drug is valid, these online products may not include what they advertise,” stated Jason Murphy, the director of pharmacy at a pharmacy service.
A medical professional of an online medical service connected the increase in demand to recent cost increases for approved weight-loss medications such as Mounjaro. “With prices rising, patients are using online platforms. But counterfeit treatments are highly risky. You cannot know what’s contained or whether the conditions they were made in was clean,” she said.
Her team has previously encountered individuals injured by personal administration from unconfirmed sources. “We recognize the disappointment, but buying from messaging apps or communication platforms is gambling with your health,” said Wyllie. “These materials could be contaminated or incorrectly dosed.”
A representative from the pharmaceutical company stated the substance was in third stage research studies and had not been reviewed or authorized by any regulatory agency globally. “Consequently at this time no one can market [it] for human use,” they explained, noting that any item “misleadingly claiming itself as a company investigational substance not yet approved … may expose patients to possibly serious health risks”.
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