Is a weight-loss service right for me?
A regulated clinician decides who is suitable for medical weight-loss support, after a proper assessment of your health and history. No comparison site can make that call, and neither can a quiz.
BMI is the usual starting point. The NHS treats a BMI of 25 or over as overweight and 30 or over as obese, with lower thresholds for people from South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean backgrounds, because weight-related health risks rise at a lower BMI in these groups. Weight-related conditions such as type 2 diabetes or high blood pressure also shape what a clinician will recommend.
Checking your own BMI takes under a minute and tells you whether a regulated service is even worth exploring.
Whatever the number says, the final decision sits with a prescriber, and a good one will sometimes say no.
Your options for managing weight
There are more routes than the adverts suggest, and none of them is automatically the right one.
- NHS support, free of charge. Your GP can check whether a weight-related condition needs attention, refer you to a local NHS weight-management programme, and talk through every option below. The NHS Better Health plan is open to anyone. Availability of specialist services varies by area.
- Diet and activity changes, with or without help. Structured programmes, dietitian appointments and coaching all sit in this lane. For many people this is the whole answer, and it costs the least.
- Regulated online clinical services. These start with a clinical assessment, and prescription-only treatment options are available via a consultation where a prescriber judges them appropriate. The clinic, its assessment and its ongoing support are what you are actually buying, which is why this page focuses on how to judge them.
NHS routes cost nothing but can involve waiting. Private online services charge a fee and leave the choice of provider entirely to you, which is exactly where careful comparison earns its keep.
How to choose a weight-loss provider
Five checks, in order. Anyone can run them in about ten minutes, and no legitimate provider will mind you doing so.
- Check the clinic is on the GPhC register. Every legitimate UK online pharmacy is registered with the General Pharmaceutical Council, and the register is public. Search the pharmacy's name or registration number; if you can't find it, stop there. Check the GPhC register yourself →
- Look at how thorough the assessment is. A proper service asks about your medical history, current medicines, weight history and mental health before anything is prescribed. A two-minute tick-box form is a warning sign, not a convenience.
- Check the support model. Who do you speak to if something feels wrong? Is there a follow-up review built in, or is the relationship over once you've paid? Ongoing clinician or pharmacist contact is what separates a clinical service from a dispatch operation.
- Compare the total cost of the consultation and service. Add up everything that is mandatory before you compare: consultation fees, service charges, delivery. A low headline "from" price with fees layered on top usually ends up costing more than an honest all-in one.
- Watch for red flags. No assessment at all, prescribing without a clinician review, guaranteed results, countdown timers, or a seller that doesn't appear on the GPhC register. Any one of these is a reason to walk away.
How costs work
What you pay splits in two: the consultation and service (the clinic's assessment, prescriber time, support and delivery) and the treatment itself. We compare the first part, provider by provider, with every price dated when we checked it.
Questions people ask
What BMI do I need for a weight-loss service?
Most regulated services follow NHS-style bands: they typically consider people with a BMI of 30 or over, or a lower BMI where there is a weight-related condition such as type 2 diabetes. Thresholds are lower for some ethnic backgrounds. Each provider publishes its own criteria, and its prescriber makes the final decision after an assessment.
How do I check a provider is legitimate?
Search for the pharmacy on the public GPhC register at pharmacyregulation.org. If the service employs prescribers through a clinic, you can also look it up on the Care Quality Commission's register. A legitimate provider displays its registration details openly; one that hides them has answered your question already.
How much does a consultation cost?
It varies. Some providers charge a separate consultation fee, others fold it into the service price, and a few refund it if you turn out not to be suitable. Compare the total mandatory cost rather than any single line item.
Can I get weight-loss support on the NHS?
Yes. Your GP can advise, refer you to local weight-management programmes and check for related conditions, all free of charge. Specialist NHS services exist but capacity differs a lot by area, which is why many people also look at regulated private options.
Will an online clinic prescribe for everyone who applies?
No, and it shouldn't. A prescriber can and does decline people who aren't suitable. A service that appears to approve everyone, instantly, is showing you a red flag rather than good customer service.
Sources
- NHS — Obesity. nhs.uk/conditions/obesity (accessed 6 July 2026)
- NHS — Calculate your body mass index (BMI). nhs.uk/health-assessment-tools (accessed 6 July 2026)
- NHS Better Health — Lose weight. nhs.uk/better-health/lose-weight (accessed 6 July 2026)
- General Pharmaceutical Council — Online registers. pharmacyregulation.org/registers (accessed 6 July 2026)
- Care Quality Commission — Find services the CQC regulates. cqc.org.uk (accessed 6 July 2026)
- Medicines and Healthcare products Regulatory Agency (MHRA). gov.uk/mhra (accessed 6 July 2026)