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Following the UK’s largest-ever seizure of illegal weight-loss medicines, consumers are being warned about counterfeit products, unregulated sellers and the importance of choosing trusted providers.

Following the UK’s largest-ever seizure of illegal weight-loss medicines, experts are warning consumers about fake weight loss jabs, counterfeit Mounjaro, unlicensed Retatrutide UK products and unregulated online suppliers. The popularity of weight loss injections such as Mounjaro, Wegovy and Ozempic has created new opportunities for patients seeking effective weight management treatment. However, it has also created opportunities for criminal networks selling illegal weight loss drugs and counterfeit weight loss injections.

The warning comes after the UK’s largest-ever seizure of unlicensed weight-loss medicines, following a raid on a Northamptonshire country estate.

In May 2026, the MHRA announced the seizure of around 12,000 doses of unlicensed medicines, including tirzepatide and retatrutide products. . Andy Morling, Head of the MHRA's Criminal Enforcement Unit, said: "There is no hiding place for those who cynically put the public's health at risk for profit." The Guardian reported that the seizure is believed to be the agency's largest operation involving illegal weight-loss medicines to date. 

The Joint Council for Cosmetic Practitioners (JCCP) warns that purchasing weight loss injections through social media, unregulated websites or illegal suppliers increases the risk of receiving counterfeit or unlicensed products. The JCCP also reports receiving more than 50 complaints relating to weight-loss injections within a 12-month period. 

Unlike legitimate medicines supplied through regulated healthcare channels, fake weight loss jabs may contain incorrect ingredients, incorrect dosages, contaminants or no active ingredient at all.

Save Face has highlighted growing concerns around illegal sales of weight-loss injections through beauty salons, social media channels and unregulated sellers. Ashton Collins, Director of Save Face, said: "Over the past 12 months, we have observed an alarming rise in reports regarding these unauthorized products being sold online." She also warned that some products are sold in unlabelled vials with instructions for consumers to mix and inject them themselves. 

Private Medical Clinic warns that counterfeit products are increasingly being designed to resemble genuine Mounjaro and Wegovy products. Source: Private Medical Clinic. Chemist4U reports that 64.5% of UK adults are overweight or living with obesity and estimates that around 500,000 people are using weight-loss injections privately. Source: Chemist4U. The same report found that Border Force seized more than 18,000 illegal or unregulated weight-loss and diabetes treatment products between February 2024 and May 2025. Source: Chemist4U.Hey Slim also notes that Retatrutide is not currently available through legitimate UK prescribing channels. Source: Hey Slim

The JCCP advises consumers to:

• Use UK-registered pharmacies

• Verify prescriber credentials

• Expect a full consultation

• Provide medical history and weight information

• Receive information about risks and side effects

Source: JCCP

The British College of Aesthetic Medicine has also stressed the importance of robust prescribing and governance around GLP-1 medications. Sadie Van Sanden Cooke, Chief Operating Officer of BCAM, said: "Whether it's a dermal filler or a GLP-1 injection, the risk is the same if sourcing, prescribing and governance aren't robust."
 

As demand for medical weight management continues to grow, so too does the importance of patient safety, education and transparency.

For consumers, taking time to research providers, ask questions and seek professional advice remains one of the most effective ways to reduce risk and access safe weight loss injections through legitimate channels.

Register your interest in AesthetiX Live to hear from trusted providers, discover the latest developments in weight management treatment and access expert-led consumer education.

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