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
Juice Plus And Weight Loss — What You Should Know
Juice Plus is a supplement marketed for general health, but there is no clinical evidence that it supports weight loss or weight management. If you're looking to lose weight in the UK, prescription weight loss medications may be an option. The NHS and private prescribers offer evidence-based options for eligible adults. Understanding what actually works — and what doesn't — is important when considering your weight management strategy.
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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 in the UK, several prescription-only medications are licensed and available. These are not supplements — they're pharmaceutical treatments that work through the GLP-1 hormone pathway:
- Mounjaro (tirzepatide) — A dual GIP and GLP-1 receptor agonist. In clinical trials, adults lost an average of 15–21% of their body weight alongside a reduced-calorie diet and increased physical activity. Administered as a once-weekly injection.
- Wegovy (semaglutide) — A GLP-1 receptor agonist. Clinical trials showed average weight loss of approximately 15% body weight. Also a once-weekly injection.
- Saxenda (liraglutide) — A GLP-1 receptor agonist. A daily injectable option. Evidence-based but less commonly prescribed in the UK than Mounjaro or Wegovy.
These medications may help reduce appetite, support feeling fuller after meals, and slow gastric emptying. Individual results vary significantly, and they work best alongside lifestyle changes, 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 And Private Access In The UK
NHS access: Prescription weight loss medications are available through tier 3 specialist weight management services. You'll need a GP referral, and access varies by region. Waiting times can be lengthy.
Private access: Available through GPhC-registered online prescribers following a clinical assessment. No NHS referral needed. You can explore eligibility through a private consultation without waiting.
To find out if you're eligible, use our free BMI calculator to check your current BMI — eligibility typically starts at BMI 30 or above, or BMI 27–29.9 with weight-related health conditions. Your GP or a licensed prescriber can assess your individual situation.
- 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 Juice Plus help with weight loss?
No. Juice Plus is a supplement with no clinical evidence for weight loss. While it may contain fruit and vegetable concentrates, supplements alone do not produce meaningful weight loss. Sustainable weight management requires either dietary changes, increased physical activity, or prescription medication with proven efficacy — or a combination of these.
What is the best prescription weight loss medication in the UK?
There is no single "best" option — it depends on your individual health, medical history, and preferences. Mounjaro and Wegovy are both evidence-based and UK-licensed. A GP or licensed prescriber will assess which is most appropriate for you following a clinical consultation. Results vary between individuals.
How much weight can I expect to lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% for Mounjaro and around 15% for Wegovy, alongside a reduced-calorie diet and increased physical activity. However, individual results vary significantly. Some people lose more, some less. Weight loss is not assured. Your prescriber can give you realistic expectations based on your health profile.
Can I get weight loss medication on the NHS?
Yes, but access is through specialist tier 3 weight management services, not standard GP prescription. You'll need a GP referral and meet eligibility criteria. Availability and waiting times vary significantly by region (ICB). Many areas have lengthy waiting lists. Private prescribing is an alternative if you want faster access.
What makes prescription weight loss medications different from supplements?
Prescription medications like Mounjaro and Wegovy are pharmaceutical treatments with large-scale clinical trial evidence. They work through specific hormone pathways to reduce appetite and support weight loss. Supplements like Juice Plus lack this level of clinical evidence and regulatory oversight. Always consult your GP about which option is right for you.
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.