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How dangerous are fake weight loss injections?

How dangerous are fake weight loss injections?

With the ever-increasing demand for weight loss injections (WLIs), more and more scammers are trying to capitalise by selling fake or counterfeit treatments that can pose a risk to your health.

Find out how to identify these fake treatments and make sure the medicines you’re buying are legitimate.

Alexandra Cristina Cowell
Medically reviewed by
Alexandra Cristina Cowell, Writer & Clinical Content Reviewer
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Reviewed on Oct 3, 2025. by Dr Alexandra Cristina Cowell Writer & Clinical Content Reviewer Next review due on Oct 3, 2028.
Alexandra Cristina

Last updated on Oct 14, 2025.

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Summary:

  • Counterfeit weight loss injections may contain harmful or incorrect ingredients, posing serious risks to your health.
  • Fake products often lack proper dosing guidance or sterile equipment.
  • Genuine injections are clear or pale yellow; cloudy or unusual liquid may indicate a fake.
  • You should only buy from NHS-approved sources and registered pharmacies.

What are the dangers of fake weight loss injections?

There are many dangers of fake WLIs, with some potentially leading to serious health consequences. Here’s why you should avoid counterfeit treatments:

Incorrect or contaminated ingredients

Fake medicines aren’t subject to the same regulations and hygiene checks as genuine products. As a result, they may contain unsterile, harmful, or even banned ingredients, which could put your health at risk.

Additionally, a shortage of WLIs due to limited ingredients means there’s a high likelihood that counterfeit products don’t contain a GLP-1, the essential ingredient needed for effective weight loss.

Without knowing the actual contents of these products, using them can be a serious risk to your health.

Dosages may be incorrect

There’s a structured process when starting WLIs. You’ll start on the lowest dose, which increases every week or month until you reach a maintenance dose you’re happy with. But this process isn't always straightforward. In some cases, your clinician might recommend remaining on a lower dose until your side effects become more manageable.

Using fakes means you have no idea what the actual dose is. So you might unknowingly start on a higher dose, which significantly increases your risk of side effects. There’s also a risk of taking too much, which could lead to overdose, very low blood sugar or severe nausea.

DIY syringes and kits

Counterfeit products don’t undergo proper regulation during manufacturing. There’s a chance they’re produced in unhygienic conditions, which could increase your risk of infections and contamination.

Another potential risk is that the needle may not be made properly; for example, it might be less sharp or not made from the appropriate material. This can increase your risk of infection and physical injury.

Another concern is that they may not provide enough needles. Typically, needles are used once and then discarded. Reusing needles can be harmful and may lead to infections, including serious ones like Hepatitis B and C.

No prescription or proper medical assessment

Using WLIs without the supervision of a clinician can be dangerous. Typically, you’ll be asked to provide some information, including:

  • Your BMI
  • Your weight
  • Any existing medical conditions
  • Current medications you are taking
  • Family history of cancers or other significant diseases

Your clinician would assess your case and make sure the treatment is safe and suitable for you. No assessment is carried out when using fakes, which puts you at serious risk. 

Where can you buy from to avoid counterfeits?

There are plenty of places where you can buy legitimate treatments and avoid counterfeits. 

NHS 

While the requirements for getting prescribed WLIs are higher on the NHS than privately, if you meet the criteria, you can buy your medication at an affordable price without any safety concerns. 

Private online pharmacy 

When considering a private online pharmacy, it’s important to check that they’re legitimate. You should look for:

  • Registration: Is the pharmacy registered with the General Pharmaceutical Council (GPhC)
  • Contact Information: Does the pharmacy provide a real address and phone number?
  • Associated Professionals: Are the doctors and clinicians registered with the relevant regulatory bodies?

Local pharmacy 

Some pharmacies supply WLIs through the NHS without needing a doctor’s consultation. But a pharmacist will assess to make sure treatment is right for you. 

How to spot fake weight loss injections

  • Price – If the price is too good to be true, it probably is fake. The NHS is the only place where you can get it at a low price of around £10. Privately, WLIs will cost anywhere from £100 to £300 and above per pen.
  • Liquid – Most injections have a window to check the liquid. Wegovy and Mounajro will be clear, colourless, or a pale yellow colour. Saxenda should be clear and colourless. If it looks cloudy or unusual, it may be a sign that the pen is fake or expired.
  • Serial and batch code – If you suspect your medicine is fake, contact the supplier (Novo Nordisk or Eli Lilly) with your batch and serial code, so they can check it’s legitimate.
  • Prescription – You always need a prescription for WLIs. If you can buy one without a prescription, it’s likely fake.

How to order Mounjaro online safely

There are many safe places to buy WLIs. You should verify that the seller is legitimate to keep yourself safe.

If you’re unable to afford legitimate WLIs, don’t risk your health. There are other effective and affordable treatments available, such as Orlistat. 

And if you come across any fake products, please report them by emailing devices.compliance@mhra.gov.uk or using the Yellow Card reporting site.

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Disclaimer: The information provided on this page is not a substitute for professional medical advice, diagnosis, or treatment. If you have any questions or concerns about your health, please talk to a doctor.