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
CoQ10 and Weight Loss — What UK Evidence Shows
CoQ10 (coenzyme Q10) is a naturally occurring compound promoted online for weight loss and metabolism, but scientific evidence for weight loss specifically is limited and mixed. Whilst CoQ10 may have some health benefits—particularly for heart health and energy production in cells—it is not established as an effective weight loss supplement. If you're seeking evidence-based weight management support in the UK, prescription medications and structured approaches may be more suitable options to discuss with your GP.
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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 looking to manage your weight effectively, several prescription weight loss medications are now available in the UK for eligible adults. These include Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide)—all of which have clinical trial evidence supporting their use.
- Mounjaro: Dual GIP and GLP-1 receptor agonist; clinical trials showed average weight loss of 15–21% of body weight
- Wegovy: GLP-1 receptor agonist; average weight loss around 15% of body weight in trials
- Saxenda: GLP-1 receptor agonist administered daily; established option with solid evidence base
All three are prescription-only and require a clinical assessment to confirm eligibility. Eligibility generally includes a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease.
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
Weight loss medication in the UK is available through two pathways: the NHS and private prescribing services. NHS access is through specialist tier 3 or tier 4 weight management services, typically requiring a GP referral—though waiting lists vary by region. Private access is available through licensed online prescribing services following a clinical consultation.
To find out if you're eligible, start by calculating your BMI using our free BMI calculator, then have a conversation with your GP about your weight management goals. If you're interested in prescription options, your prescriber can assess your individual health, medications, and suitability. Remember, any weight loss medication works best alongside a reduced-calorie diet 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.
Is CoQ10 effective for weight loss?
CoQ10 has limited and mixed scientific evidence for weight loss. Whilst it supports cellular energy production and may have cardiovascular benefits, it is not established as an effective weight loss supplement. If weight management is your goal, evidence-based prescription medications or structured dietary approaches may be more suitable.
What is the difference between Mounjaro and Wegovy?
Both are prescription weight loss injections, but they work differently. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, whilst Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials showed Mounjaro resulted in slightly higher average weight loss (15–21% vs 15%), though individual results vary.
How do I know if I'm eligible for prescription weight loss medication in the UK?
You're generally eligible if you have a BMI of 30 or above, or 27–29.9 with a weight-related health condition like type 2 diabetes or high blood pressure. Use our free BMI calculator to check your BMI, then discuss eligibility with your GP or a licensed prescriber.
Can I get weight loss medication through the NHS?
Yes, NHS access is available through specialist weight management services (tier 3/4), typically via GP referral. However, waiting times vary significantly by region. Private prescribing is also available in the UK without an NHS referral for eligible adults.
How much weight can I expect to lose with prescription medication?
Clinical trials show average weight loss of 15–21% of body weight, but individual results vary significantly. Weight loss depends on factors including the specific medication, dose, adherence, diet, and physical activity. Always discuss realistic expectations with your prescriber.
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.