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 Green Tea Pills Help with Weight Loss?
Green tea pills have been promoted as a natural weight loss supplement, but the evidence for their effectiveness is limited. While green tea contains compounds like catechins and caffeine that may have modest metabolic effects, clinical research shows the weight loss benefits are generally small — typically around 1–3 kg over several months when combined with diet and exercise. For UK adults seeking more substantial weight management support, NHS-approved prescription options and lifestyle changes offer stronger evidence-based results.
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 Research Actually Show?
Green tea pills contain concentrated extracts from green tea leaves, primarily targeting compounds called catechins and caffeine. Studies show these compounds can slightly increase fat oxidation and thermogenesis (calorie burning), but the effect is modest.
- Most clinical trials show weight loss of 1–3 kg over 8–12 weeks when combined with calorie restriction
- The caffeine content (typically 25–50 mg per pill) contributes to increased alertness but minimal appetite suppression
- Results are inconsistent — some people experience no weight loss at all
- Green tea pills work best as part of overall lifestyle change, not as a standalone solution
A major limitation is that studies are often small and may be sponsored by supplement manufacturers, which can bias results. The UK's National Institute for Health and Care Excellence (NICE) does not recommend green tea pills as a primary weight loss treatment.
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.
How Green Tea Pills Compare to Evidence-Based Alternatives
If you're looking for weight management support in the UK, there are more effective options backed by stronger clinical evidence. For prescription weight loss medication, GLP-1 injections like Wegovy or Mounjaro have demonstrated average weight loss of 14–21% of body weight in clinical trials — significantly more than green tea supplements.
Lifestyle changes including a reduced-calorie diet, regular physical activity, and behavioural support remain the foundation of sustainable weight loss. For those with a BMI of 30 or above (or 27+ with weight-related health conditions), your GP can discuss prescription options or refer you to NHS specialist weight management services. Our free BMI calculator and GLP-1 weight loss calculator can help you understand your starting point and explore what results may be possible with evidence-based approaches.
- 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 green tea weight loss pills safe?
Green tea pills are generally safe for most adults, though they may cause side effects like stomach upset, headaches, or jitteriness due to caffeine content. People sensitive to caffeine, pregnant women, and those with liver conditions should avoid them. Always inform your GP if you're taking supplements, especially alongside other medications.
How much weight can you lose with green tea pills?
Clinical trials show average weight loss of 1–3 kg over 8–12 weeks when combined with diet and exercise. Results vary significantly between individuals, and some people experience no measurable weight loss. These pills are not a substitute for calorie reduction and physical activity.
Do green tea pills work without diet and exercise?
No. Green tea pills have no meaningful effect on weight loss without accompanying dietary changes and physical activity. They are designed to complement, not replace, lifestyle changes. Sustainable weight loss requires a calorie deficit created through reduced food intake and increased activity.
How do green tea pills compare to Wegovy or Mounjaro?
Wegovy and Mounjaro are prescription-only GLP-1 medications with much stronger clinical evidence. In trials, Wegovy produced average weight loss of approximately 15% of body weight, while Mounjaro achieved 15–21% — far exceeding green tea pills' 1–3 kg effect. These medications require clinical assessment and a prescription.
Can I buy green tea pills on the NHS?
No. The NHS does not prescribe green tea supplements for weight loss, as evidence does not support them as a primary treatment. The NHS focuses on lifestyle interventions first, then prescription medications like GLP-1 injections for eligible adults. Speak to your GP about available weight management options.
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.