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
Weight Loss Green Tea Pills and UK Prescription Alternatives
Green tea pills are marketed as natural weight loss supplements, but the evidence for their effectiveness is limited. If you're exploring weight management options in the UK, it's worth knowing about prescription medications that have stronger clinical evidence. This guide explains what green tea pills claim to do, compares them to NHS-approved prescription weight loss options, and helps you understand which approaches are backed by evidence. Our free BMI calculator above can help you check your current weight status and see if you might be eligible for prescription treatment.
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.
UK-Licensed Prescription Weight Loss Options
For adults who meet NHS eligibility criteria, prescription weight management medications offer stronger clinical evidence than supplements. The main prescription weight loss medications available in the UK are:
- Mounjaro (tirzepatide) — a once-weekly injection that works on two hormone pathways (GIP and GLP-1). Clinical trials showed average weight loss of 15–21% of body weight over 72 weeks when combined with diet and exercise.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. Clinical trials demonstrated average weight loss of around 15% of body weight when used alongside lifestyle changes.
- Saxenda (liraglutide) — a once-daily GLP-1 injection, with similar evidence to Wegovy.
All are prescription-only medicines requiring clinical assessment. You can calculate potential weight loss outcomes using our free GLP-1 weight loss calculator above. Eligibility typically requires a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea.
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 to Access Weight Loss Support in the UK
If you're interested in exploring weight management options through the NHS, start by speaking with your GP. They can assess your individual health situation and, if appropriate, refer you to a specialist tier 3 weight management service. Waiting times vary by region, and availability differs across England, Scotland, Wales, and Northern Ireland.
Private prescription weight loss medication is also available through online clinics with UK-licensed prescribers, without NHS referral. A licensed prescriber will conduct a clinical assessment to determine suitability. Track your progress with our free progress tracker once you begin any weight loss journey. Sustainable weight loss typically occurs at 0.5–1 kg per week alongside dietary changes and increased physical activity.
- 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 weight loss pills actually work?
Green tea contains compounds called catechins that may have modest metabolic effects, but clinical evidence is weak. Most studies show minimal weight loss (1–3 kg) and require very high doses. Prescription GLP-1 medications like Wegovy and Mounjaro have much stronger clinical evidence, with participants losing 15–21% of body weight in trials.
What's the difference between green tea pills and prescription weight loss injections?
Green tea pills are unregulated dietary supplements with limited evidence. Prescription medications like Mounjaro and Wegovy are clinically tested, regulated by the MHRA, and require a prescription following clinical assessment. Prescription options have demonstrated significant weight loss in large clinical trials.
How do I know if I'm eligible for prescription weight loss treatment in the UK?
You may be eligible if you have a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Use our free BMI calculator above to check your current status, then speak with your GP about your options.
Can I get Mounjaro or Wegovy on the NHS?
Yes, both are available through NHS specialist tier 3 weight management services, though availability and waiting times vary significantly by region (ICB). Your GP can refer you if you're eligible. Private prescription is also available through UK-licensed online prescribers without NHS referral.
Is prescription weight loss medication safe?
Prescription weight loss medications like Mounjaro and Wegovy have undergone extensive clinical trials and are approved by the MHRA. Side effects are generally manageable (nausea, diarrhoea, constipation). Serious complications are rare but can occur. A prescriber will assess whether it's safe and appropriate for your individual health situation.
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.