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 Work for Weight Loss?
Raspberry ketones are a natural compound found in raspberries that are heavily marketed as weight loss supplements. However, the scientific evidence supporting their effectiveness for weight loss in humans is limited. Most clinical research has been conducted in animals or small human studies with mixed results. If you're looking for evidence-based weight loss support, NHS-recommended approaches and prescription options may be more effective. This guide explains what the science actually shows about raspberry ketones and explores proven alternatives for sustainable weight management in the UK.
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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 Science Say About Raspberry Ketones?
Raspberry ketones (4-hydroxybenzyl methyl ketone) are compounds that give raspberries their flavour. Some research in animals suggests they may increase fat breakdown and boost metabolism, but evidence in humans is far less conclusive. A small 2013 human study found modest weight loss when combined with diet and exercise, but the results were not statistically significant compared to placebo.
The main limitations are:
- Most studies are small with very few human participants
- Results are mixed and inconsistent across different trials
- Doses used in studies are extremely high compared to typical supplements
- No evidence shows they work without diet and exercise changes
- Long-term safety data in humans is lacking
The UK Medicines and Healthcare products Regulatory Agency (MHRA) does not regulate supplements as strictly as prescription medicines, so quality and potency can vary significantly between brands.
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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.
Proven Weight Loss Methods Available in the UK
If you're seeking weight management solutions with stronger evidence, the NHS recommends starting with lifestyle changes: a reduced-calorie diet and increased physical activity typically support losing 0.5–1 kg per week. For prescription weight loss support, GLP-1 medications like Mounjaro and Wegovy are licensed in the UK and have clinical trial evidence showing average weight losses of 15–21%. These require a prescription following a clinical assessment with a GP or specialist prescriber. Our free GLP-1 weight loss calculator can help you understand potential outcomes. You can also use our free BMI calculator to establish your starting point and track progress with our progress tracker as you work towards your health goals.
- 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.
Are raspberry ketone supplements safe?
Raspberry ketones are generally considered safe at low doses, but safety data is limited. Side effects are rare but may include jitteriness, rapid heartbeat, or stomach upset. Always inform your GP if taking supplements, especially if you're on other medications or have underlying health conditions.
Do raspberry ketones work without diet and exercise?
No. The limited evidence for raspberry ketones only shows modest effects when combined with a reduced-calorie diet and increased physical activity. No supplement can produce significant weight loss without these lifestyle changes.
How does raspberry ketone weight loss compare to GLP-1 injections?
Prescription GLP-1 medications like Wegovy have far stronger clinical evidence. The STEP trial showed Wegovy helped participants lose approximately 15% of body weight on average, while evidence for raspberry ketones in humans is minimal and inconsistent.
Why are raspberry ketones so heavily marketed?
Supplements have less rigorous regulation than prescription medicines in the UK. Marketing claims can often outpace the actual scientific evidence. Always check independent sources like the NHS or peer-reviewed research rather than supplement company claims.
What should I do if I want evidence-based weight loss support?
Start by speaking to your GP about NHS weight management services, which may include behaviour change programmes or referral to specialist tier 3 services. For prescription options, your GP can assess whether medications like Mounjaro or Wegovy are appropriate following a clinical assessment of your individual health.
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.