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
Does Garcinia Cambogia Help With Weight Loss?
Garcinia cambogia, a tropical fruit extract containing hydroxycitric acid (HCA), is widely marketed as a weight loss supplement. However, scientific evidence for its effectiveness in helping people lose weight is limited and inconclusive. Most UK health authorities, including the NHS, do not recommend garcinia cambogia as a proven weight management solution. If you're looking for evidence-based approaches to weight loss, this guide explains what the research actually shows and what prescription weight loss medication is available in the UK.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Show About Garcinia Cambogia?
Multiple clinical studies and systematic reviews have examined garcinia cambogia's weight loss claims, with disappointing results. Most high-quality trials show little to no significant difference in weight loss between garcinia cambogia and placebo. A 2019 review in the Journal of Obesity found that whilst some studies reported modest reductions (typically 0.5–1 kg more than placebo), the evidence base is weak and results are not reliable or consistent.
The supplement may work by theoretically reducing appetite or blocking fat production, but these mechanisms have not been proven in humans at meaningful levels. Common issues with garcinia cambogia research include small study sizes, short trial durations, and poor quality control in supplement manufacturing. Additionally, garcinia cambogia is not regulated as a medicine in the UK — it's classed as a food supplement, which means it doesn't undergo the same rigorous testing or safety monitoring as prescription medications.
For comparison, prescription weight loss medication like GLP-1 injections (Mounjaro and Wegovy) have been tested in large, well-designed clinical trials and show average weight loss of 15–21% of body weight — far exceeding any effect demonstrated by garcinia cambogia.
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.
Evidence-Based Weight Loss Options in the UK
If you're serious about weight loss with robust scientific evidence behind it, the NHS and private prescription options in the UK include GLP-1 weight loss medication (prescription-only), structured diet programmes, and exercise combined with behavioural support. Use our free GLP-1 weight loss calculator above to explore potential weight loss with evidence-based prescription options, and try the BMI calculator to understand your current health category.
The NHS recommends losing weight at a sustainable rate of 0.5–1 kg per week through a calorie deficit, dietary changes, and increased physical activity. For those who meet NHS eligibility criteria (BMI 30 or above, or 27+ with weight-related health conditions), prescription weight loss medication may be available through specialist NHS weight management services or via private prescription. Always consult your GP before starting any weight loss programme or supplement.
- 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.
Is garcinia cambogia approved by the NHS for weight loss?
No. The NHS does not recommend garcinia cambogia for weight loss because scientific evidence does not support its effectiveness. It is not approved or licensed as a weight management treatment in the UK. If you're interested in NHS-approved options, speak to your GP about accessing specialist weight management services.
How does garcinia cambogia compare to GLP-1 weight loss injections?
Garcinia cambogia shows minimal effect in clinical trials (often similar to placebo), whilst GLP-1 medications like Wegovy and Mounjaro have demonstrated average weight loss of 15–21% of body weight in large clinical trials. GLP-1 injections are prescription-only and require clinical assessment, but evidence for their effectiveness is robust.
Can I buy garcinia cambogia in the UK?
Yes, garcinia cambogia supplements are sold over the counter in health shops and online as dietary supplements. However, they are not regulated as medicines, so quality, purity, and strength vary. The UK Medicines and Healthcare products Regulatory Agency (MHRA) does not approve garcinia cambogia as a weight loss treatment.
What are the risks of taking garcinia cambogia?
Garcinia cambogia is generally considered safe in short-term use, but side effects can include headache, stomach upset, and nausea. There are also concerns about interactions with diabetes medication and liver health. Always inform your GP if you're taking supplements, especially if you have existing health conditions.
What actually works for weight loss in the UK?
Evidence-based approaches include: calorie deficit (500 kcal per day for ~0.5 kg/week loss), Mediterranean or low-carb diet, increased physical activity, behavioural support, and for eligible individuals, prescription weight loss medication. The NHS recommends discussing your options with your GP or a specialist weight management service.
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.