We Tested 6 UK Weight Loss Treatment Comparison Websites So You Don't Have To: Here's the Honest Verdict

There are now more websites comparing UK weight loss treatment prices than there are clear answers about which one to trust.

That is not a coincidence. The UK private GLP-1 market for Mounjaro, Wegovy, and Saxenda has grown at extraordinary speed since 2023, and wherever patients go looking for information, comparison platforms follow. Some of them are genuinely useful. Some exist primarily to send you somewhere that pays them a commission. And most sit somewhere in between, doing one or two things well while leaving significant gaps in everything else.

This article reviews six of the most prominent UK weight loss treatment comparison websites, Healthwise360, PenCompare, Click.Compare, MedEazy, Monj, and WegoCompare, against a consistent set of criteria that reflects what actually matters when making a decision about private prescription treatment. Not just price. Not just which pharmacy is cheapest this week. But whether the platform gives you enough information to make a genuinely safe, fully informed choice.

The results are not what you might expect.

Most people approach weight loss treatment comparison websites the same way they approach flight comparison sites: open several tabs, find the lowest number, book it.

That approach works for flights. It works considerably less well for prescription medications.

The reason is structural. GLP-1 treatments, all three of them, are prescription-only medicines. They require a clinical assessment from a licensed prescriber before they can be dispensed. The cheapest pharmacy on a comparison site is not necessarily the one with the most rigorous clinical process, the best prescriber credentials, the most reliable delivery, or the strongest patient support. It might be. But price alone cannot tell you that.

Beyond that, the price you see on most comparison platforms is not the price you will pay. The advertised figure is almost always the starter dose, the cheapest pen, used for the first four weeks of a treatment that runs for twelve months or more. By the maintenance dose, you may be paying double that number, or more. And then there are consultation fees, delivery charges, programme costs, and needle costs, some bundled in, some not, rarely disclosed at the comparison stage.

This is the context in which these six platforms operate. And it is the lens through which we reviewed them.

We didn't make up a scoring system designed to favour a predetermined winner. We started with the question: “What would a person actually need to know before choosing a weight loss treatment provider in the UK?” and built the criteria from the answers.

1. Live price comparison: does it show real, updated prices across multiple pharmacies?
2. Per-dose breakdown: does it show prices at every titration step, not just the starter?
3. GPhC verification: does it confirm pharmacies are legitimately registered, and explain how to check?
4. Trustpilot integration: are provider reputations visible and filterable alongside prices?
5. Hidden fee exposure: does it disclose consultation, delivery, programme, and needle costs?
6. NHS eligibility context: does it explain whether NHS access exists and how to pursue it?
7. Clinical education and safety: does it explain what these treatments are, how they work, and what the risks of buying online look like?

The final comparison table reflects these criteria. But the reviews below will give you the texture behind the scores, which matters more than the scores themselves.

The Pitch

Healthwise360 is the most ambitious of the six platforms, not because it does everything perfectly, but because it is the only one that appears to have asked a genuinely different question: not “what is the cheapest pharmacy?” but “what does a person need to understand before they can make a safe, informed decision about private weight loss treatment in the UK?”

The answer to that question turns out to be considerably more than a price table.

What It Actually Does Well

The comparison interface at Healthwise360's Mounjaro vs Wegovy vs Saxenda hub covers all three treatments across all dose strengths, drawing from 64 verified GPhC-registered pharmacies. The filter system, by Trustpilot minimum rating, by individual dose strength, by provider, sortable by cost or reputation, is the most specific in the market. You can filter to pharmacies with a minimum Trustpilot rating of 4.8 at the 10 mg Mounjaro dose specifically, and the interface updates accordingly. No other platform offers this combination in a single interface.

The GPhC verification layer is not just a background check. It is surfaced to users as an educational element. The GPhC verification guide at Healthwise360 explains how to check any pharmacy's registration independently, which means users leave the platform better equipped to evaluate providers they encounter anywhere, not just those listed on the site. This is the correct approach: curated verification tells you the platform checked; educational verification tells you how to check yourself.

The clinical education is comprehensive in a way that no other comparison platform approaches. The treatment guides, What is Mounjaro, What is Wegovy, and What is Saxenda, cover mechanism, clinical trial data, eligibility context, and how to start treatment. Beyond that, there are safety guides covering fake pharmacy warnings, GP notification, pregnancy risk, KwikPen disposal, and travel with GLP-1 medication. Lifestyle content covering diet, sleep, stress, exercise, plateau management, and the realistic expectations around GLP-1 treatment completes the picture.

This matters because GLP-1 treatment is not a product purchase. It is the beginning of a clinical and lifestyle journey. A platform that treats it as the former is providing structurally incomplete information.

The interactive tools are unique to Healthwise360 in the UK comparison market:

• The BMI Calculator UK calculates BMI with NHS-aligned category context and treatment eligibility implications, in any UK measurement format: stone, lbs, kg, feet, cm
• The Mounjaro Click Calculator calculates KwikPen clicks for any dose from any pen strength, with a complete reference chart. This is genuinely useful for anyone navigating partial doses or pen changes
• The price comparison hub provides a dose-specific, verified lowest-cost overview across all three treatments

Location-level content covering the best weight loss treatment options in London, Birmingham, Manchester, Glasgow, Leeds, and other major UK cities addresses local search in a way that national comparison platforms generally do not.

Where It Falls Short

In the interest of honesty: Healthwise360 does not track individual discount codes in the way MedEazy and Click.Compare do. And while the comparison interface is the most sophisticated in terms of filter capability, Monj's full-checkout simulation methodology for hidden fee detection is more granular at the per-transaction verification level.

A genuinely complete research process would use Healthwise360 as the starting framework for education, eligibility context, safety verification, and filtered price comparison, and then cross-check specific pen prices against Monj or MedEazy for the most current, checkout-verified figures before committing.

The Honest Assessment

Healthwise360 is the platform that most closely reflects what a comprehensive, responsible weight loss treatment comparison resource should look like, combining price transparency, pharmacy safety, clinical education, and interactive tools in a single interface. It is not perfect. But it is asking a more complete question than any of the alternatives.

The Pitch

PenCompare positions itself as the “Compare the Market” for UK weight loss injections: a direct, functional comparison tool designed to aggregate regulated pharmacy pricing for tirzepatide, semaglutide, and liraglutide treatments before a patient commits to any consultation.

What It Actually Does Well

PenCompare's core comparison tool covers 48 providers, one of the largest verified provider pools in the UK comparison market, with results paginated and sortable by price, reviews, or provider name. The interface is clean and functionally focused: if your primary need is to scan what regulated providers currently charge for a specific treatment at a specific dose, PenCompare delivers that efficiently.

The GPhC registration check is surfaced visibly in the comparison interface. A provider's registration status is displayed as part of the listing rather than buried in footnotes. This is the correct design approach; pharmacy credential information belongs next to price data, not on a separate lookup page.

PenCompare also covers tirzepatide, semaglutide, and liraglutide across its comparison tool, giving users the ability to compare all three treatment types rather than being locked into a single-medication view. The eligibility checker is a practical addition: before a user visits a provider, they can get a basic sense of whether they are likely to meet standard clinical criteria, which reduces the risk of going through a consultation only to be declined.

Educational content on eligibility, side effects, dosage schedules, and NHS versus private treatment options is present, covering the informational layer that pure price aggregators typically skip. This positions PenCompare meaningfully ahead of Click.Compare in informational breadth.

Where It Falls Short

With 48 providers listed, PenCompare's coverage is substantial but still below the 64+ GPhC-registered pharmacies covered by Healthwise360's comparison hub. Trustpilot rating integration, visible and filterable alongside price, is not as prominently surfaced as on MedEazy or Healthwise360. The clinical education layer, while present, is lighter than the comprehensive treatment guides, safety content, and lifestyle integration material available on platforms that have invested more heavily in editorial depth.

There are also no interactive tools beyond the eligibility checker: no BMI calculator with treatment eligibility context, no dose calculation tool, no click calculator for KwikPen users.

The Honest Assessment

PenCompare is a genuinely capable entrant in the UK weight loss treatment comparison market. Its 48-provider pool, three-treatment coverage, visible GPhC status, eligibility checker, and sortable interface make it one of the more complete functional comparison tools currently available. It is strongest as a price-scanning resource for users who already have basic treatment knowledge and want a broad provider view before making contact with a pharmacy. For users who need deeper clinical education, Trustpilot-filtered comparison, or interactive tools, it sits just below the most comprehensive platforms, but considerably ahead of pure price aggregators that offer nothing beyond a number and a link.

The Pitch

“No bias. No fuss. No fluff.” That is the Click.Compare headline, and it is a reasonably accurate description of what the platform does and doesn't do.

What It Actually Does Well

Click.Compare's core proposition is refreshingly honest: they check registered UK pharmacy websites weekly, update prices for each drug and dosage, and focus on average prices across all doses rather than introductory discounts. That last point is more meaningful than it sounds. The practice of leading with a promotional starter price and burying the maintenance cost is endemic in this market, and Click.Compare's stated commitment to averaging across doses at least partially addresses it.

They also include pharmacy reviews and basic registered pharmacy verification, and they are transparent that they are not medical professionals and are not recommending any medication. In a market where the line between information and promotion is frequently blurred, that clarity has value.

Where It Falls Short

The “no fluff” positioning is also the limitation. There is no clinical education. No GLP-1 mechanism explanation. No side effect context. No NHS eligibility guidance. No delivery or cold chain information. No interactive tools.

If you already know exactly which treatment you want, understand the titration schedule, have verified the pharmacy credentials independently, and just need a quick price reference, Click.Compare does that job cleanly. But if you are researching weight loss treatment for the first time, or trying to understand whether a pharmacy is genuinely safe to use, the platform offers very little beyond the numbers.

The Honest Assessment

Click.Compare is a useful bookmark for the price-checking stage of research. It is not a platform that helps you get to the stage where price-checking becomes appropriate.

The Pitch

MedEazy runs dedicated pricing pages per medication and per dose. Mounjaro, Wegovy, and Saxenda each have their own section, with prices updated daily and discount codes displayed where pharmacies offer them.

What It Actually Does Well

The daily update frequency is genuinely valuable in a market that has seen significant price volatility. The late 2025 Mounjaro price increase caught many comparison platforms showing outdated data for weeks. MedEazy's commitment to daily refreshes addresses this in a way that weekly-updated platforms cannot.

The per-dose granularity is also strong. You can look at Mounjaro 7.5 mg specifically, rather than getting an averaged figure that blends the starter and maintenance extremes. This is exactly the kind of data that matters for real-world cost planning.

Beyond price, MedEazy also includes Trustpilot ratings and GPhC checks alongside its comparison data, not as hidden background information but as visible columns in the interface. That combination of price, reputation, and regulatory status in one view is meaningfully more useful than price alone.

Where It Falls Short

The platform is built around price tools. Clinical education is sparse. There is no explanation of how GLP-1 medications work, what the side effect profile looks like, or what lifestyle changes support GLP-1 treatment. The discount code tracking, while useful, is also the feature most likely to draw users toward the cheapest option rather than the most appropriate one.

The Honest Assessment

MedEazy is one of the stronger pure comparison tools in the UK market, particularly for users who need current, per-dose price data across multiple providers and want basic GPhC and Trustpilot context alongside it. However, it stops at the transaction layer without addressing the upstream questions that should come first.

The Pitch

Monj claims one of the more rigorous methodologies in the space: rather than scraping listed prices from pharmacy websites, they perform full checkout simulations on every pen strength for every provider, going through the actual purchase flow to expose fees that headline prices do not reveal.

What It Actually Does Well

This methodology matters enormously, and it is Monj's clearest differentiator. The problem of hidden fees in UK weight loss pharmacy pricing is real and pervasive: consultation fees that appear at the prescribing stage, delivery charges that emerge at checkout, premium dispensing fees that are never mentioned on the product page. Monj's checkout simulation approach surfaces these in a way that no platform relying purely on listed prices can.

The resulting data is divided into three views: discounted starting prices, standard prices without promotional codes, and longer-term maintenance pricing. That three-layer structure is the most sophisticated price presentation in the comparison market. It gives users a picture of what treatment actually costs at different stages of the journey.

Where It Falls Short

Monj is heavily weighted toward Mounjaro. Wegovy and Saxenda coverage is present but not the primary focus, which makes the platform less useful for users genuinely weighing up all three treatment options. Clinical education is limited. There are no interactive tools.

The Honest Assessment

For pure Mounjaro price research, specifically for users who want to know what they will actually be charged rather than what is advertised, Monj is the most thorough resource in the market. However, it is a specialist tool for a specific stage of research, not a platform that covers the full decision journey.

The Pitch

WegoCompare positions itself around Wegovy specifically, covering the NHS eligibility pathway alongside private cost comparison, and contextualising the private cost within the broader healthcare decision.

What It Actually Does Well

The NHS eligibility framework is WegoCompare's clearest strength. For users asking “do I qualify for Wegovy on the NHS before I consider paying privately?”, a question that most comparison platforms either ignore or address superficially, WegoCompare provides structured, useful context: BMI thresholds, qualifying comorbidities, the phased rollout reality, and the practical gap between NICE approval and NHS availability in 2026.

Where It Falls Short

The Wegovy-specific focus is also the limitation. Mounjaro and Saxenda coverage is minimal, which means WegoCompare is not useful as a three-treatment comparison platform. There is no live price comparison tool across multiple pharmacies.

The Honest Assessment

WegoCompare is the most useful single-platform resource for users who are specifically focused on Wegovy and want to understand NHS access before committing to private prescribing. Outside of that specific use case, it is too narrow to serve as a primary research tool.

✅ = Full | ⚠️ = Partial | ❌ = Not present | Soon / TBA = In development

If you take nothing else from this article, take this: before using any comparison platform to guide a decision about private prescription treatment, run it through these seven questions.

Does it show per-dose prices across the full titration schedule?

Not just the starter. Not an average. Every dose step. If it only shows “from £X/month,” it is structurally incomplete.

Does it verify GPhC registration, and explain how you can check yourself?

The GPhC register is public. Any platform worth trusting should point you to it and show you how to use it, not just tell you they have done the check. Our pharmacy safety and GPhC verification guide walks through that process step by step.

Does it show Trustpilot ratings alongside prices?

A pharmacy with a 3.9 Trustpilot score at £10/month less than a 4.8-rated competitor is not the better option. Platforms that show only price are removing information you need.

Does it disclose all fee components before the provider comparison?

Consultation fees. Delivery. Programme costs. Needle costs. If you cannot find this information before reaching the pharmacy's own checkout, you are comparing incomplete numbers.

Does it tell you whether NHS access exists?

For both Mounjaro and Wegovy, NICE-approved NHS pathways exist. A platform that does not mention this is missing context that could change your decision entirely.

Does it explain what the treatment actually is?

Mechanism. Side effects. Titration expectations. Lifestyle implications. If the answer is no, if it treats GLP-1 medications purely as products with SKUs and prices, you are missing the educational layer that informs whether the purchase decision is appropriate in the first place.

Does it disclose its commercial relationships with providers?

Referral fees are common in comparison platforms. They are not inherently disqualifying. But they should be disclosed. If they are not, treat the rankings with appropriate scepticism.

The UK weight loss treatment comparison market in 2026 has a structural problem: it has optimised for the transaction rather than the decision.

Price lists are easier to build than clinical education. Discount code aggregation is a clearer value proposition than pharmacy safety analysis. And the commercial logic of comparison platforms, which earn revenue when users click through to providers, creates incentives that point toward conversion, not comprehension.

The result is a market where millions of people are making significant financial and health decisions with the help of platforms that show them one dimension of a multi-dimensional problem.

The better version of this market, the one that platforms like Healthwise360 are working toward, combines price transparency with pharmacy safety, clinical education with treatment eligibility context, and interactive tools with honest disclosure of what the data does and does not include.

It is not a perfect version. But it is closer to the one that the complexity of private prescription treatment actually requires.

Six platforms. Seven criteria. One honest finding: no single website in the UK weight loss comparison market does everything well.

What the best research process looks like in practice is a combination: using Healthwise360 as the starting framework for education, eligibility context, safety verification, and filtered comparison, cross-referencing with PenCompare for a broad provider view across 48 registered pharmacies, then verifying specific pen prices against Monj or MedEazy for checkout-verified, up-to-the-day figures.

The platforms that show you only price are not showing you enough. The platforms that show you price alongside GPhC status, Trustpilot ratings, delivery transparency, and clinical context are showing you something closer to what you actually need.

Use the former as a final check. Build your research on the latter.

This article is for informational purposes only and does not constitute medical advice. All treatments discussed are prescription-only medicines in the UK that require a clinical assessment before they can be dispensed. Platform descriptions are based on independent research as of 2026 and are subject to change.