MHRA enforcement: three retatrutide raids in seven months

Between October 2025 and May 2026 the MHRA raided three sites in the East Midlands where retatrutide and tirzepatide injections were being made and packed for sale. What officers found tells you more about the product people receive than any listing does.

October 2025: a warehouse outside Northampton

On 22 to 24 October 2025, officers from the MHRA's Criminal Enforcement Unit, supported by Northamptonshire Police, searched a warehouse on an industrial estate outside Northampton. The MHRA described it as the first illicit weight-loss injection factory found in the UK.^[1]

They seized more than 2,000 unlicensed retatrutide and tirzepatide pens that were packed and waiting to be sent to customers, tens of thousands of empty pens "ready to be filled", raw chemical ingredients, packaging, manufacturing equipment and around £20,000 in cash. The street value of the finished pens alone was put at more than a quarter of a million pounds. The MHRA called it the "largest single seizure of trafficked weight loss medicines ever recorded by a law enforcement agency worldwide".^[1]

The same announcement carried the MHRA's position on retatrutide: it "has not been approved for UK use", and outside authorised trials any product sold in the UK claiming to contain it is "likely to be illegal" and "potentially dangerous to people's health".^[1]

February 2026: a farm near Sleaford and a house in Grantham

On 25 February 2026 the MHRA, with Lincolnshire Police, Immigration Enforcement and Lincolnshire Trading Standards, searched a farm near Sleaford and a residential address in Grantham. The MHRA linked the two premises to the same criminal network as the Northampton warehouse.^[2][6]

Officers seized almost 2,000 doses of unauthorised weight-loss medicines that were awaiting dispatch, together with manufacturing equipment, suspected pharmaceutical ingredients, packaging and commercial vehicles. The MHRA said the sites were believed to have been used to make and distribute unlicensed weight-loss medicines including retatrutide and tirzepatide, as well as other peptide products.^[2]

May 2026: a country estate near Northampton

On the night of 28 May 2026, announced the next day, the MHRA raided a country estate near Northampton with support from Northamptonshire Police. Two men, both aged 29, were arrested on suspicion of offences under the Human Medicines Regulations 2012. Around 12,000 doses of unlicensed weight-loss medicines, including retatrutide and tirzepatide, were recovered. The MHRA called it its "largest ever seizure of unlicensed weight loss medicines" and said the property was believed to have been a large-scale facility to manufacture, assemble and distribute them.^[3][7]

The wider picture: 2025 in numbers

In January 2026 the MHRA published its enforcement totals for 2025. Working with law-enforcement partners it seized almost 20 million doses of illegally traded medicines, with a street value of nearly £45 million, up from 17 million doses in 2024. The total included 9.9 million doses of sedatives, 4.4 million of erectile dysfunction medicines, 4.1 million of painkillers, 427,300 doses of nervous-system agents and 5,680 GLP-1 pens. The unit also worked with internet providers to disrupt more than 1,500 websites and social media accounts and removed more than 1,200 posts.^[4]

The MHRA's own summary of why this matters: most seized medicines are not authorised for sale in the UK, "so can contain too much or too little of the declared active ingredient and may also contain other harmful ingredients".^[4]

The New Year warning

At the end of December 2025 the MHRA issued a public warning timed for New Year resolutions. It said products sold illegally "may be fake, contaminated, incorrectly dosed, or contain powerful ingredients not listed on the packaging", with risks including heart problems, psychological effects and dangerously low blood sugar. It advised against obtaining prescription-only medicines without a prescription, against weight-loss products promoted on social media, and asked people to report suspicious products through the Yellow Card scheme.^[8]

Lilly's lawsuits

On 12 August 2026 Eli Lilly, which owns retatrutide, filed six lawsuits in the United States against businesses it says were selling retatrutide products for human use, including some that labelled them "research use only". Lilly said it had referred more than 200 individuals and entities to the FDA, the US Department of Justice, state attorneys general and licensing boards, and had reported more than 14,000 websites, advertisements, social media posts and listings offering retatrutide in over 100 countries.^[9][10][5] The FDA has said that sales of retatrutide to consumers are illegal and that it cannot lawfully be compounded, because it is not an approved drug.^[10]

This site does not name the companies involved. The point is not who they are; it is that the company that invented the drug says nobody outside a trial is selling the real thing.

What "empty pens ready to be filled" tells you

The Northampton finding is worth sitting with. Tens of thousands of empty injection pens, raw chemical ingredients, and a stock of filled pens waiting to go out.^[1] That is a hand-filling operation: powder of unknown origin and purity, made up into liquid somewhere in a warehouse, and loaded into pens by whoever was there that day.

A licensed injectable is made in a validated clean room, filled by a sterile process that has been tested and inspected, and released only after every batch passes tests for identity, strength, sterility and endotoxin. None of that happens in a warehouse with a box of empty pens. Whether a given pen has the right amount, or the right substance, or any bacteria in it, comes down to the care and honesty of an anonymous person on a given afternoon. The testing results page shows what that produces, and the certificate of analysis page explains why paperwork does not fix it.

What enforcement can and cannot do

Enforcement can take stock out of circulation, arrest the people running a site and disrupt the websites and accounts that sell it. Each of the three raids did that.

It cannot make the products that have already been sold safe, and it cannot keep up with a trade that is run from many countries through social media. The 2025 totals show the scale: nearly 20 million doses in a year, and more each year.^[4] A raid on one warehouse is a real blow to that network, and it does nothing for the pen already in someone's fridge.

The other thing enforcement relies on is people telling the MHRA what happened to them. Yellow Card reports from people harmed by fake or unlicensed products are how the regulator spots clusters and decides where to look next. The reporting page explains how, and why it does not get you into trouble.