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
Korea Weight Loss Jelly and UK Weight Loss Options
Korea weight loss jelly products are popular online, but they're not regulated as medicines in the UK and lack clinical evidence. If you're looking for effective weight management support in the UK, prescription medications are available for eligible adults. These licensed options have clinical trial evidence and are prescribed by healthcare professionals following a proper assessment. This guide explains what's actually available through the NHS and private prescription in the UK, how to check your eligibility, and how to start a conversation with your GP about weight loss support.
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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.
Licensed Weight Loss Medication Available in the UK
Three prescription weight loss medications are licensed in the UK for weight management:
- Mounjaro (tirzepatide) — a once-weekly injection that activates two natural appetite-control pathways. Clinical trials showed an average weight loss of 15–21% body weight over 72 weeks when combined with dietary changes and physical activity.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. In clinical trials, participants lost approximately 15% of their body weight on average at the highest dose.
- Saxenda (liraglutide) — a daily injection option with similar mechanism to Wegovy.
All three are prescription-only medicines requiring a clinical assessment before prescription. Individual results vary significantly, and medication is always used alongside dietary changes and increased physical activity, not instead of them.
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 Eligibility and How to Get Started
You may be eligible for prescription weight loss medication through the NHS if you have a BMI of 30 or above, or a BMI of 27–29.9 with a weight-related health condition such as type 2 diabetes, high blood pressure, or obstructive sleep apnoea. Lower thresholds apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage.
Start by talking to your GP, who can assess your individual health situation and discuss options. NHS access is through specialist tier 3 weight management services, though waiting times vary by region. Private prescription is also available through online consultations if you prefer faster access. Use our GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to check your current status.
- 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.
Is Korea weight loss jelly safe to use in the UK?
Korea weight loss jelly products sold online are not regulated as medicines by the MHRA and lack clinical safety and efficacy data. The NHS and MHRA recommend using only licensed, prescription-only weight loss medications that have been properly tested and approved. Unregulated products carry unknown risks and may contain unlisted ingredients.
What's the difference between Mounjaro and Wegovy?
Both are once-weekly injections for weight loss. Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro showed slightly higher average weight loss (15–21% vs 15%) in clinical trials, but individual results vary. Your prescriber will assess which is more suitable for you based on your health profile.
Can I get weight loss medication through the NHS?
Yes, if you're eligible. You need a BMI of 30 or above (or 27–29.9 with weight-related health conditions) and must be referred to a specialist tier 3 weight management service by your GP. Availability and waiting times vary by region. Private prescription is faster but involves a cost, typically £129–£320 per month depending on dose.
How quickly can I expect to lose weight on prescription medication?
Clinical trials show average weight loss of 0.5–1 kg per week when medication is combined with a reduced-calorie diet and increased physical activity. The NHS recommends this rate for sustainable, healthy weight loss. However, individual results vary significantly based on starting weight, lifestyle changes, and your body's response to the medication.
Is prescription weight loss medication suitable for everyone?
No. Prescription weight loss medications are not suitable if you're pregnant, breastfeeding, under 18, or have certain medical conditions like severe gastroparesis. They also interact with some medications, including oral contraceptives. Your prescriber will assess your full medical history and determine suitability through a proper clinical consultation.
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.