The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Do Raspberry Ketones Help with Weight Loss?
Raspberry ketones are natural compounds found in raspberries that are heavily marketed as weight loss supplements. However, the scientific evidence supporting their effectiveness in humans is very limited. Most research has been conducted in laboratory or animal studies, with minimal credible clinical trials in people. If you're looking for evidence-based weight management options in the UK, there are far more proven alternatives — from lifestyle changes to prescription weight loss medications — that your GP can discuss with you.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
What Does the Evidence Say About Raspberry Ketones?
Raspberry ketones are marketed based on claims that they increase fat breakdown and boost metabolism. However, the scientific reality is quite different. Most studies showing benefits have been conducted in test tubes or animals, not humans. The few small human studies that exist show minimal, inconsistent results — often no better than placebo. The UK's NHS does not recommend raspberry ketone supplements for weight loss, and they are not regulated as medicines, meaning their quality and safety cannot be assured in the same way prescription treatments can be.
- Limited human evidence: Very few robust clinical trials exist in people
- Often sold as unregulated supplements: May contain undeclared ingredients or varying potency
- No NHS recommendation: Not supported by NHS weight management guidance
- Expensive relative to benefit: Cost-effectiveness is poor compared to evidence-based options
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
What Weight Management Options Are Actually Proven?
If you're looking to lose weight and want evidence-based support, several proven options are available through the NHS and private prescribing in the UK. Prescription weight loss medications like Mounjaro (tirzepatide) and Wegovy (semaglutide) have strong clinical trial evidence showing average weight loss of 15–21% of body weight. These are GLP-1 medications that help reduce appetite and support feeling fuller after meals. You can use our free GLP-1 weight loss calculator to see projected results at different doses. Alternatively, structured lifestyle programmes combining reduced-calorie diet and increased physical activity remain the gold standard for sustainable weight management.
- Speak to your GP about NHS weight management services
- Check your BMI using our free BMI calculator to understand your starting point
- Consider prescription options if eligible (BMI ≥30 or ≥27 with health conditions)
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Do raspberry ketones actually work for weight loss?
Clinical evidence in humans is very limited. Most studies showing benefits were done in test tubes or animals. The few human trials that exist show minimal results — typically no better than placebo. The NHS does not recommend them for weight loss. If you want evidence-based weight loss support, speak to your GP about proven options.
Are raspberry ketone supplements safe?
While generally considered safe in small amounts, raspberry ketone supplements are not regulated as medicines in the UK. This means their quality, purity, and potency cannot be assured. Some products may contain undeclared ingredients. Always check the source and speak to your GP before starting any supplement, especially if you take medications.
What's a better alternative to raspberry ketones for weight loss?
Proven options include prescription weight loss medications like Mounjaro and Wegovy (if eligible), structured lifestyle programmes combining diet and exercise, and NHS weight management services. Our free GLP-1 weight loss calculator can show you projected results with medication. Your GP can assess what's suitable for you.
How much weight can I expect to lose with raspberry ketones?
Evidence suggests minimal to no significant weight loss specifically from raspberry ketones. Any weight loss attributed to them is likely due to overall calorie reduction or placebo effect, not the supplement itself. For realistic, evidence-based weight loss projections, speak to your GP or use proven weight management tools.
Can I buy raspberry ketones on prescription in the UK?
No. Raspberry ketone supplements are not available on prescription because they lack sufficient clinical evidence. If you're looking for prescription weight loss support, your GP can refer you to NHS specialist weight management services or discuss private prescription options for proven medications like Mounjaro or Wegovy.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.