The London Assembly has warned that dangerous unlicensed weight loss drugs are being sold privately by unregulated prescribers. Health Secretary Wes Streeting is now calling for a crackdown. Here is exactly what to check before you hand over a penny.
If you have been thinking about starting Mounjaro or Wegovy privately, you are not alone. Millions of women in the UK are exploring these treatments right now. But a serious warning issued in March 2026 means you need to know how to spot a rogue prescriber before you buy.
The London Assembly Health Committee published a report in March 2026 identifying a growing problem. Unregulated providers are selling unlicensed weight loss drugs — meaning drugs that have not been approved for use in the UK — directly to patients with little or no medical oversight [London Assembly Health Committee, March 2026].
Health Secretary Wes Streeting has publicly called for a crackdown on these rogue prescribers [London Assembly Health Committee, March 2026]. That is a significant political signal. It means the problem is real enough to have reached Cabinet level.
What Does “Unlicensed” Actually Mean?
An unlicensed drug is one that the MHRA — the Medicines and Healthcare products Regulatory Agency, which is the UK’s medicines watchdog — has not approved for that specific use in this country [MHRA, gov.uk].
Licensed drugs like Mounjaro (tirzepatide) and Wegovy (semaglutide) have gone through rigorous safety and efficacy trials. Unlicensed alternatives have not cleared that bar. You have no guarantee of what is actually in them.
Some rogue providers sell compounded or counterfeit versions of these drugs. Compounded means mixed up outside of a regulated pharmaceutical facility. The MHRA has issued multiple warnings about fake semaglutide and tirzepatide products circulating in the UK [MHRA Safety Alert, 2024-2025].
In plain English: you could be injecting something entirely unknown into your body. That is not a small risk.
The Two Registrations That Actually Matter
Before you purchase any private weight loss treatment, you need to check two things. Both checks are free and take under five minutes.
First: Is the clinic CQC registered? The CQC — the Care Quality Commission — regulates health and social care services in England [CQC, cqc.org.uk]. Any legitimate private clinic providing prescriptions must be registered with them. You can search the CQC register for free at cqc.org.uk. If a provider is not on that list, walk away.
Second: Is the pharmacy GPhC registered? The GPhC — the General Pharmaceutical Council — regulates pharmacies and pharmacists in Great Britain [GPhC, pharmacyregulation.org]. Any online pharmacy dispensing your medication must appear on the GPhC register. You can check this at pharmacyregulation.org. Again, if they are not listed, do not buy from them.
The London Assembly Health Committee specifically urged patients to carry out both of these checks before purchasing [London Assembly Health Committee, March 2026]. This is not bureaucratic box-ticking. These registers exist precisely to protect you.
Red Flags to Watch For Right Now
Rogue prescribers have become skilled at looking legitimate online. Here are the warning signs that should stop you in your tracks.
No medical questionnaire or consultation. A safe provider will always assess your medical history before prescribing. If you can add a GLP-1 injection to a basket and check out without speaking to anyone, something is wrong.
Prices that seem impossibly low. Legitimate Mounjaro treatment in the UK starts at around £164 per month with reputable providers [heySlim UK Research, April 2026]. If someone is offering it for £30 or £40 a month, the product is almost certainly not what it claims to be.
No UK address or contact number. Legitimate providers operating in the UK must be contactable and physically based here. A foreign address or only a web contact form should raise immediate concern.
Claims that sound too good to be true. Phrases like “no prescription needed” or “medical-grade, no doctor required” are serious red flags. In the UK, tirzepatide and semaglutide are prescription-only medicines [MHRA, gov.uk]. No exceptions.
What a Legitimate Provider Should Offer You
A proper UK weight loss clinic should give you several things as standard. You should receive a full medical consultation before any prescription is issued. A qualified prescriber — a doctor, nurse prescriber, or pharmacist prescriber — should review your health history personally.
They should monitor you throughout treatment. That means regular check-ins, not just taking your money and disappearing. And they should be transparent about what drug they are prescribing, its exact dosage, and which licensed pharmacy is dispensing it.
Established UK providers like Juniper, Voy, Numan, and Second Nature are examples of services that operate within the regulated framework [heySlim UK Research, April 2026]. That does not mean they are the only legitimate options. But it does illustrate what a properly structured service looks like.
If your current provider cannot answer basic questions about their CQC registration or GPhC-registered dispensing pharmacy, that is your answer. Find someone else.
What to Do If You Think You Have Been Sold an Unsafe Product
If you have already purchased from a provider and you are now concerned, there are steps you can take.
Stop taking the medication until you have spoken to a healthcare professional. Contact your GP and explain what you have taken. Report the provider to the MHRA using their Yellow Card scheme at yellowcard.mhra.gov.uk. You can also report an unregistered pharmacy to the GPhC directly.
The MHRA takes these reports seriously. Your report could protect someone else from the same situation.
The bottom line is straightforward. Rogue weight loss prescribers are a real and growing problem in the UK, serious enough to prompt a government-level response [London Assembly Health Committee, March 2026]. The two free checks — CQC register and GPhC register — take five minutes and could protect your health. No saving on monthly costs is worth the risk of injecting an unregulated, unknown substance.
This article is for information purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any treatment.
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This article is for information purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any treatment. Information correct at time of publication. The Peptide Brief updates articles when guidance changes.
