How to Choose Among the Best Weight Loss Injection Companies

Picture this: you've found three companies with similar prices and similar-looking websites

One has a pharmacy registration number on the footer. One mentions a prescriber but doesn't name them. One offers a discount code and next-day delivery with no clinical questionnaire in sight. The question isn't which costs less, it's which of these companies is actually operating within UK law.

Mounjaro and Wegovy are not supplements or over-the-counter products. Under the Human Medicines Regulations 2012, they can only be supplied following a clinical assessment by a licensed prescriber. Any company offering these medicines without that step is operating illegally, and the product you receive may not be what the label says. In 2025, the MHRA seized approximately 20 million doses of illegally traded weight-loss medicines worth around £45 million, and raided the first UK site manufacturing counterfeit tirzepatide pens. The threat is real and it is domestic.

The first thing worth doing (it takes under a minute) is checking any online pharmacy's GPhC registration on the GPhC pharmacy register. A legitimate provider will give you their registration number without you having to ask. Fake or unregistered sellers rarely survive this single check.

For a broader overview of what each injection involves before you compare providers, the weight loss injections guide on our site covers the licensed options and how they work.

What the clinical process at a reputable company should actually look like

The clinical assessment is not a formality. A responsible provider reviews your medical history, BMI, any existing conditions, current medicines and contraindications before a prescriber decides whether treatment is appropriate for you. That review should be done by a named, GPhC-registered Independent Prescriber (not an algorithm) and it should happen before every dispensing decision, including repeat orders and dose changes.

At nume, every consultation is personally reviewed by a GPhC-registered Independent Prescriber the same day. Photo-ID identity verification, live weight confirmation via video and Summary Care Record checks are part of the process because they matter for safety, not because they make a nice bullet point. Patients transferring from another provider must provide evidence of their current treatment; dose increases require clinical evidence too.

NHS England's guidance on weight management injections sets out what responsible clinical oversight looks like, including how prescribers should approach GP notification, contraception interactions and perioperative advice. If you are comparing providers and want to understand what separates a trustworthy service from a risky one, our guide to finding the best company for weight loss injections walks through the specific standards a legitimate provider should meet.

If you want to understand how Mounjaro and Wegovy compare across mechanism, trial results and licensed doses, that's a useful starting point before deciding which might suit you.

Cost context: what you're actually buying when you pay for this treatment

Since Eli Lilly raised Mounjaro's UK list price in September 2025, private monthly costs have typically ranged from around £149 to £375 depending on the dose and the provider. That spread matters less than what the price includes.

A headline figure that excludes the consultation fee, prescription charge, delivery cost and any aftercare support can look competitive while costing more in practice. Our cost breakdown page explains the components a legitimate price should cover. For treatment that starts and titrates over months, ongoing clinical support isn't optional, it's the part that makes the difference between a medicine that works and one that causes problems without anyone qualified noticing.

At nume, one transparent price covers the consultation, prescription, treatment, and free next-working-day tracked delivery. There are no subscriptions, no auto-renewals, and no hidden fees. That's a deliberate choice, not a selling point, the clinical re-review before each repeat order is what keeps the process safe.

Cheapest isn't a useful test for a prescription medicine. The right question is whether the company is registered, whether a qualified person is actually reviewing your case, and whether the supply chain leads back to an authorised Lilly or Novo Nordisk distributor. Those three things narrow the field considerably.

Red flags that should give you pause, and green ones that should give you confidence

A few patterns reliably separate credible providers from risky ones. On the concerning side: no visible GPhC number, no named prescriber, offers of discount codes tied to the medicine itself, prices far below the market range described above, and no requirement for clinical history before you can proceed. The MHRA has been explicit that discount codes from unverified sellers are a warning sign, these are prescription medicines, not consumer products that respond normally to promotional pricing.

On the reassuring side: a verifiable GPhC registration, a named clinical team (our prescribers are introduced at our clinical team page), clear explanations of what happens if you have side effects, and aftercare that is available seven days a week rather than during a narrow support window.

If you're also weighing up which specific medicine might suit your circumstances, the weight loss injection overview sets out how each licensed option works and what the eligibility criteria are under UK guidance, based on NICE's appraisal of tirzepatide and the existing NICE recommendation for semaglutide. Some patients also ask about glucose injections for weight loss, so that page explains what they are and how they relate to the licensed treatments available in the UK. A prescriber makes the final call on suitability, but arriving informed makes that conversation more useful.