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
Green Tea Capsules for Weight Loss — What Works in the UK
Green tea capsules are a popular supplement for weight management, but the evidence for their effectiveness is modest. While green tea contains antioxidants and may support a small amount of weight loss, most UK health professionals recommend prescription weight loss medication for adults who need significant support. If you have a BMI of 30 or above, or 27 or above with weight-related health conditions, you may be eligible for prescription treatment. Our free BMI calculator can help you understand where you stand, and your GP can discuss which options are right for 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.
Prescription Weight Loss Options Available in the UK
For adults needing medically supported weight loss, the UK has three prescription-only weight loss injections licensed by the MHRA:
- Mounjaro (tirzepatide) — a once-weekly dual GIP/GLP-1 receptor agonist. Clinical trials showed an average weight loss of 15–21% of body weight over 72 weeks alongside diet and activity changes.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. Average weight loss in clinical trials was approximately 15% of body weight.
- Saxenda (liraglutide) — a daily GLP-1 injection, typically used as a second-line option.
These are evidence-based prescription medications requiring clinical assessment. Individual results vary significantly. They work best combined with dietary changes and increased physical activity. If you're interested in exploring whether prescription weight loss medication might be suitable, try our free GLP-1 weight loss calculator to estimate potential outcomes at different doses.
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.
NHS vs Private Access and Next Steps
NHS access: Prescription weight loss medication is available through NHS specialist tier 3 weight management services. Your GP can refer you for assessment, though waiting lists and regional availability vary significantly.
Private access: Licensed online prescribers can provide prescriptions following an online clinical assessment, without needing an NHS referral.
Start by discussing your weight management goals with your GP. They can assess your BMI, any weight-related health conditions, and advise whether prescription medication is appropriate for you. Use our weight converter to track your progress in both kg and stone, and our progress tracker to log changes over time.
- 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 green tea capsules actually help with weight loss?
Green tea contains catechins and caffeine, which may support modest weight loss (approximately 1–3 kg over several months) when combined with diet and exercise. However, the effect is small. For significant, evidence-based weight loss support, prescription medications approved in the UK—such as Mounjaro and Wegovy—show much stronger results in clinical trials.
What's the difference between supplements like green tea and prescription weight loss medication?
Supplements like green tea capsules have limited clinical evidence and modest effects. Prescription weight loss medications are rigorously tested, licensed by the MHRA, and show average weight loss of 15–21% of body weight in clinical trials. They require a prescription and clinical assessment but offer proven support for eligible adults.
Am I eligible for prescription weight loss treatment in the UK?
You may be eligible if you have a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Use our free BMI calculator to check your BMI, then speak with your GP about whether prescription options are appropriate for you.
Can I use green tea capsules alongside prescription weight loss medication?
Some people may use both, but this must be discussed with your prescriber. Prescription weight loss medications work through specific hormone pathways, and adding supplements should only be done under medical guidance to ensure safety and avoid interactions.
How do I find out if I'm eligible for NHS weight loss medication?
Start by speaking with your GP. They can assess your BMI, health conditions, and medication history, then refer you to a specialist tier 3 weight management service if appropriate. Alternatively, you can access private online prescribing through licensed providers without an NHS referral, following an online clinical assessment.
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.