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
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Tea Detox for Weight Loss — What Works in the UK
Tea detox products are heavily marketed for weight loss, but evidence for their effectiveness is limited. While some herbal teas may support general health, sustainable weight management typically requires lifestyle changes — diet, physical activity, and sometimes prescription medication. If you're struggling with weight management in the UK, prescription options like Mounjaro and Wegovy are now available through NHS services or private prescription following clinical assessment. This guide explains what the evidence actually shows about detox teas and outlines the medically approved weight loss options available to eligible UK adults.
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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 significant and sustainable weight loss, prescription weight loss medications are available in the UK for adults meeting specific eligibility criteria. The most effective options are:
- Mounjaro (tirzepatide) — a dual GIP/GLP-1 receptor agonist. Clinical trials showed average weight loss of 15–21% of body weight over 72 weeks, alongside reduced-calorie diet and increased physical activity.
- Wegovy (semaglutide) — a GLP-1 receptor agonist. Clinical trials demonstrated average weight loss of approximately 15% body weight at 68 weeks.
- Saxenda (liraglutide) — a once-daily GLP-1 injection. Available for adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions.
All are prescription-only medicines requiring clinical assessment. Individual results vary significantly. These medications work best when combined with dietary changes and increased physical activity — not as replacements for lifestyle modification.
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 — How to Find Out If You're Eligible
In the UK, prescription weight loss medication is accessed through two main routes:
- NHS: Referral to your regional tier 3 specialist weight management service. Eligibility typically requires BMI ≥30, or BMI 27–29.9 with weight-related conditions such as type 2 diabetes, hypertension, or cardiovascular disease. Regional availability varies — waiting lists can be lengthy in some areas.
- Private: Online consultation with a UK-licensed prescriber, available without NHS referral. A clinical assessment determines suitability. Many private providers offer convenient online prescribing and pharmacy dispatch.
Start by speaking to your GP about your weight management goals. They can assess whether prescription medication is appropriate for you and discuss NHS referral options. Alternatively, you can access private prescribing directly through registered providers. Use our free BMI calculator to check your starting point, and our GLP-1 weight loss calculator to explore potential outcomes at different doses.
- 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.
Does tea detox actually help you lose weight?
Limited scientific evidence supports weight loss from tea detoxes alone. Some herbal teas may offer minor metabolic benefits or support general health, but effective weight loss requires a calorie deficit, physical activity, and sustained lifestyle change. Detox teas are not a substitute for evidence-based approaches or prescription medication when clinically indicated.
What's the difference between Mounjaro and Wegovy for weight loss?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist showing average weight loss of 15–21% in trials. Wegovy (semaglutide) is a GLP-1 agonist showing average weight loss of around 15%. Both are once-weekly injections. Individual results vary. Your GP or prescriber will assess which is most appropriate for you.
Who is eligible for prescription weight loss medication on the NHS?
Generally, adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, sleep apnoea, cardiovascular disease). You need referral to a specialist tier 3 weight management service. Lower thresholds may apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. Ask your GP about regional eligibility.
Can I get prescription weight loss medication privately without NHS referral?
Yes. Private online prescribers can assess your suitability following a clinical consultation. If eligible, they'll issue a prescription to a GPhC-registered pharmacy. This route is faster than NHS referral in many areas but involves private costs. Prices vary by medication and dose, typically £129–£320 per month.
Are prescription weight loss injections safe?
Yes, when prescribed and monitored appropriately. All UK-licensed weight loss medications (Mounjaro, Wegovy, Saxenda) have undergone rigorous clinical trials. Side effects are common but usually manageable — nausea, diarrhoea, and constipation are most frequent. Serious side effects are rare. Your prescriber will discuss risks and monitor your progress throughout treatment.
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.