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
L-Carnitine Weight Loss Results: What 1 Month Actually Shows
L-carnitine is an amino acid supplement that some people take hoping for gradual weight management results. However, the evidence for meaningful weight loss over just one month is limited. In the UK, sustainable weight loss is typically achieved through calorie deficit, increased physical activity, and—when medically appropriate—prescription weight loss medication. This guide explains what L-carnitine can and cannot do, and explores evidence-based alternatives backed by NHS guidelines and clinical research.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
What Does L-Carnitine Actually Do?
L-carnitine is a compound your body naturally produces from the amino acids lysine and methionine. It plays a role in transporting fatty acids into cells for energy production. Some supplement manufacturers claim it accelerates fat burning, but scientific evidence for significant weight loss is weak.
- Most studies show minimal weight loss with L-carnitine supplementation alone (typically under 1 kg over several weeks)
- Results are modest even when combined with exercise and diet
- One month is too short to see meaningful, sustained weight loss
- The NHS does not recommend L-carnitine as a primary weight management tool
- For people with adequate dietary intake, supplementation provides no additional benefit
If you want to check whether your current weight is within a healthy range for your height, use our free BMI calculator above to get your personal BMI and NHS category instantly.
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.
Evidence-Based Weight Loss in the UK
The NHS recommends losing weight at a rate of 0.5 to 1 kg per week for sustainable results. In one month, realistic weight loss ranges from 2 to 4 kg when following a calorie deficit approach alongside increased physical activity. For people with a BMI of 30 or above—or 27 or above with weight-related health conditions—prescription weight loss medication may be appropriate. Our GLP-1 weight loss calculator can help you estimate potential results with evidence-based treatments like Mounjaro or Wegovy, which have shown average weight loss of 15–21% over several months in clinical trials.
- 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 L-carnitine really help you lose weight?
L-carnitine may provide modest support for fat metabolism, but clinical evidence shows minimal weight loss (typically under 1 kg) compared to placebo. It is not a primary weight loss tool and works best alongside diet and exercise—but even then, results are limited.
How much weight can you lose in 1 month?
With a sustainable 500 kcal daily calorie deficit, most people lose 2–4 kg in one month. NHS weight loss injections like Mounjaro and Wegovy show greater average losses (15–21% over months), but these require prescription and clinical assessment.
Is L-carnitine available on the NHS?
No. L-carnitine supplements are not prescribed on the NHS for weight loss. The NHS recommends lifestyle changes first, then—if needed—NHS-approved prescription medications through specialist weight management services.
What's a better alternative to L-carnitine for weight loss?
A calorie deficit with increased physical activity is evidence-based and works for everyone. If you have a BMI of 30+ or 27+ with health conditions, ask your GP about referral to specialist weight management services where prescription treatments may be offered.
Can I combine L-carnitine with prescription weight loss medication?
Always consult your GP or prescriber before combining any supplements with prescription medication. They can assess your individual health and advise whether L-carnitine is safe alongside treatments like Mounjaro or Wegovy.
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.