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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Best Female Weight Loss Supplement — What Women Need to Know
When it comes to weight management in the UK, the most effective supplement option for many women is a prescription GLP-1 medication like Wegovy (semaglutide). These are not traditional over-the-counter supplements — they're prescription-only medicines that work by regulating appetite and supporting weight loss alongside lifestyle changes. This guide explains how they work, what the evidence shows, and how to access them through the NHS or private prescribing. Individual results vary, and any weight loss treatment should be discussed with your GP to ensure it's right for your specific health needs.
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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.
How GLP-1 Weight Loss Medication Works for Women
The most clinically effective weight loss option available in the UK is Wegovy (semaglutide), a prescription-only GLP-1 receptor agonist injection. GLP-1 is a natural hormone your gut produces after eating — it signals fullness to your brain and helps regulate blood sugar. Wegovy mimics this hormone, which means it may help reduce appetite, support feeling fuller after smaller meals, and slow how quickly food leaves your stomach.
In the STEP-1 clinical trial, women taking Wegovy at the maximum dose (2.4 mg once weekly) lost an average of approximately 15% of their body weight over 68 weeks, alongside a reduced-calorie diet and increased physical activity. For context, a woman weighing 80 kg might lose around 12 kg on average — though individual results vary significantly.
Women often respond well to GLP-1 treatment because the medication's appetite-regulation mechanism works consistently regardless of gender. However, it's essential to understand that Wegovy is prescription-only and requires a clinical assessment to confirm eligibility. It's not a standalone solution — weight loss is most effective when combined with dietary changes and exercise.
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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.
Eligibility and How to Access Weight Loss Prescription in the UK
To be eligible for prescription weight loss medication in the UK, you typically need a BMI of 30 or above, or BMI of 27–29.9 with at least one weight-related health condition (such as type 2 diabetes, high blood pressure, or sleep apnoea). For women of South Asian, Chinese, Black African, or Black Caribbean heritage, NHS guidance recommends lower BMI thresholds — eligibility may start at 27.5.
You can access prescription weight loss treatment through two routes: NHS specialist weight management services (referred by your GP, though waiting lists vary by region) or private online prescribing through a GPhC-registered pharmacy following an online clinical assessment. Use our free BMI calculator above to check your starting point, and our GLP-1 weight loss calculator to project potential outcomes at different doses. Always consult your GP before starting any weight loss treatment.
- 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 Wegovy safe for women to use long-term?
Wegovy is approved by MHRA for long-term weight management and has been used safely in clinical trials lasting over a year. However, it's prescription-only and requires ongoing medical supervision. Common side effects include nausea and digestive changes, typically mild and temporary. Always discuss safety concerns with your prescriber.
What's the difference between Ozempic and Wegovy?
Both contain semaglutide, but Ozempic is licensed for type 2 diabetes (doses up to 2 mg) and using it for weight loss is off-label. Wegovy is specifically licensed for weight management in the UK at doses up to 2.4 mg. Only use the medication your prescriber recommends.
Can I use weight loss injections while breastfeeding?
No, Wegovy and similar GLP-1 medications are not recommended during breastfeeding. If you're pregnant or breastfeeding, discuss weight management options with your GP — safer alternatives may be recommended during this time.
How quickly will I see weight loss results?
Most women begin to notice appetite changes within 1–2 weeks, though weight loss typically becomes measurable after 4–8 weeks. The full benefit appears over 12–16 weeks. Results vary — some women lose more, others less. Consistency with diet and exercise matters significantly.
Are there non-prescription weight loss supplements that work?
Evidence for over-the-counter supplements is limited. The most effective weight loss approach combines a calorie deficit, regular physical activity, and behavioural support. If you have a BMI over 27, discuss prescription options with your GP — they're more evidence-based than most supplements.
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.