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 Pills and Weight Loss — What Works in the UK
Green tea pills are popular supplements, but their weight loss effects are modest and not well-established by clinical evidence. If you're looking for effective weight management support in the UK, prescription medications and lifestyle changes are proven to work better. This guide explains what green tea pills actually do, and introduces you to the prescription weight loss options available through the NHS and private prescribing 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.
UK-Licensed Prescription Weight Loss Options
If you're interested in weight management medication in the UK, three prescription-only medications are currently licensed for weight loss and have strong clinical evidence behind them:
- Mounjaro (tirzepatide) — a once-weekly injection, dual GIP and GLP-1 receptor agonist. Clinical trials showed average weight loss of 15–21% body weight over 72 weeks when combined with a reduced-calorie diet and increased physical activity.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. STEP trials demonstrated average weight loss of approximately 15% body weight alongside lifestyle changes.
- Saxenda (liraglutide) — a daily GLP-1 injection option, though once-weekly alternatives are more commonly prescribed.
These medications work by affecting natural hormones that regulate appetite and fullness. Unlike green tea pills, they have NHS approval and evidence-based clinical support for weight management in eligible adults.
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.
Am I Eligible and How to Access Treatment
In the UK, you may be eligible for prescription weight loss treatment if you have a BMI of 30 or above, or a BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or heart disease. Use our free BMI calculator above to check where you stand.
Access is available through two routes: NHS specialist weight management services (referral from your GP, though waiting times vary significantly by region), or private online prescribing following a clinical assessment. Your GP can discuss which option is right for you and help you understand eligibility based on your personal health situation. Try our GLP-1 weight loss calculator to explore potential outcomes with prescription medication.
To understand your current weight position and health context, use our free weight converter to switch between kg, stone, and pounds. This helps you see where your weight falls against NHS guidelines and BMI weight loss benchmarks. A GP or prescriber will assess your overall health, medical history, and whether prescription medication is appropriate for you individually.
- 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 pills actually help with weight loss?
Green tea extract contains caffeine and catechins that may have modest thermogenic effects (slightly increased calorie burning), but clinical evidence is limited. Any effect is small — usually 1–3 kg over months — and much less significant than prescription weight loss medication or lifestyle changes. They're not considered an evidence-based weight management option by the NHS.
How do prescription weight loss injections like Mounjaro work differently?
Mounjaro and Wegovy work on natural hunger hormones (GLP-1 and GIP) to reduce appetite, increase feeling of fullness, and support sustainable weight loss. Clinical trials show 15–21% average body weight loss, far greater than supplements. They require a prescription and clinical assessment because they're medicines, not supplements.
What's the difference between NHS and private weight loss treatment in the UK?
NHS access is through specialist tier 3 services via GP referral, though waiting lists vary by region. Private access is through GPhC-registered online prescribers following an online assessment, available without NHS referral. Both require a clinical assessment; the main differences are speed and cost.
Am I eligible for prescription weight loss medication?
Eligibility depends on BMI and health conditions. Generally, BMI 30 and above, or 27–29.9 with conditions like diabetes or high blood pressure qualify. Lower thresholds apply to South Asian, Black African, and Black Caribbean adults. Your GP or an online prescriber can assess your eligibility.
Can I use green tea pills alongside prescription weight loss medication?
Some supplements and medications interact. Always inform your prescriber about any supplements you're taking. Prescription weight loss treatment is designed to work alongside diet and exercise — add-on supplements are usually unnecessary and should be discussed with your GP.
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.