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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Does Liquid Carnitine Help with Weight Loss?
Liquid carnitine is a supplement that some people take for weight loss, but the evidence for its effectiveness is limited. While it plays a role in fat metabolism in the body, clinical trials haven't shown it produces meaningful weight loss in most people. If you're looking at weight management options in the UK, it's worth understanding what actually works—and how prescription weight loss medications compare. This guide breaks down what the research shows about liquid carnitine and explores evidence-based alternatives for sustainable weight loss.
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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.
What Does the Research Show About Liquid Carnitine?
Carnitine is an amino acid derivative that helps transport fatty acids into cells where they can be used for energy. In theory, more carnitine should mean more fat burning—but research doesn't support this for weight loss in healthy people.
Studies on liquid carnitine supplementation have found:
- Most healthy individuals already produce sufficient carnitine naturally
- Supplementation does not reliably increase fat burning or reduce body weight
- Some small studies show modest benefits only in specific populations (such as people with heart disease or certain medical conditions)
- Any weight loss seen is typically minimal and similar to placebo
The NHS and most clinical organisations do not recommend carnitine supplements as a weight loss tool. If you're aiming for sustainable weight loss, focusing on calorie reduction and physical activity remains the evidence-based foundation. For those needing additional support, prescription weight loss medication has much stronger clinical evidence.
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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 Does This Compare to Prescription Weight Loss Options?
Unlike liquid carnitine, prescription weight loss medications have clinical trial data showing real results. GLP-1 weight loss injections—such as Wegovy (semaglutide)—work through a different mechanism: they reduce appetite and help you feel fuller after eating.
In clinical trials, Wegovy helped people lose an average of around 15% of their body weight alongside a reduced-calorie diet and increased physical activity. Prescription medications require a clinical assessment and are only available through your GP or a licensed prescriber—they're not available over the counter.
If you're considering weight loss support, it's worth discussing with your GP what options might suit your health and circumstances. Our free GLP-1 weight loss calculator can help you explore potential outcomes with prescription medication, while our BMI calculator shows where you currently stand on the NHS weight categories. Sustainable weight loss typically combines dietary changes, physical activity, and—where appropriate—medical support.
- 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 liquid carnitine actually help you lose weight?
Clinical evidence does not support liquid carnitine as an effective weight loss supplement for most healthy people. While carnitine plays a role in fat metabolism, studies show supplementation does not produce meaningful weight loss compared to placebo. The NHS does not recommend it for weight management.
Is liquid carnitine safe to take?
Liquid carnitine is generally considered safe for most people at recommended doses. However, it's not proven effective for weight loss. If you're considering any supplement or medication, mention it to your GP first—especially if you take other medicines or have existing health conditions.
What actually works for weight loss in the UK?
Sustainable weight loss combines a calorie deficit (typically 500 kcal/day for around 0.5kg per week), increased physical activity, and behaviour change. For those who need additional support, prescription weight loss medications like Wegovy have strong clinical trial evidence. Always discuss options with your GP.
How do prescription weight loss injections compare to supplements like carnitine?
Prescription GLP-1 medications like Wegovy have clinical trials showing an average weight loss of around 15% of body weight, whereas carnitine shows minimal effect. Prescription medications require a clinical assessment and are only available through a licensed prescriber or NHS specialist service.
Where can I find evidence-based weight loss support in the UK?
Start with your GP, who can refer you to NHS weight management services (tier 1–4 depending on your needs). The NHS recommends sustainable weight loss of 0.5–1kg per week. Use our BMI calculator to check your current health category and track progress with our free progress tracker tool.
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.