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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Supplements for PCOS Weight Loss — and When to Consider Prescription Options
If you have PCOS (polycystic ovary syndrome) and are looking for weight loss support, supplements alone may not be enough. While inositol and other micronutrients may help with insulin resistance, prescription weight management medication offers stronger clinical evidence. In the UK, eligible adults with PCOS can access GLP-1 weight loss injections through NHS specialist services or private prescribing. This guide explores your options and how to find out if you qualify for prescription-based weight management.
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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 Prescription Weight Loss Options for PCOS
For adults with PCOS seeking weight management, UK-licensed prescription options include:
- Mounjaro (tirzepatide) — dual GIP/GLP-1 agonist, once-weekly injection, average weight loss 15–21% body weight in clinical trials
- Wegovy (semaglutide) — GLP-1 agonist, once-weekly injection, average weight loss ~15% body weight
- Saxenda (liraglutide) — GLP-1 agonist, once-daily injection
You may be eligible if your BMI is 30 or above, or 27 or above with weight-related health conditions (including PCOS). Calculate your BMI using our free BMI calculator above. These are prescription-only medicines requiring clinical assessment by a GP or licensed prescriber to confirm suitability.
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 Access vs Private Prescribing — How to Get Started
NHS route: Ask your GP for a referral to your local tier 3 specialist weight management service. NICE has approved tirzepatide (Mounjaro) for NHS use, though regional availability and waiting lists vary significantly. You may wait several months for assessment.
Private route: UK-licensed online prescribers can issue prescriptions following a clinical assessment, available within days. Costs range from £129–£320 monthly depending on medication and dose. Your GP remains your first point of contact for personalised advice about which approach suits your PCOS and overall health.
Track your weight loss progress with our free progress tracker. Whether using supplements, lifestyle changes, or prescription medication, consistent monitoring helps you see patterns and stay motivated. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses if you're considering prescription options.
- 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.
Do supplements for PCOS actually work for weight loss?
Some supplements like myo-inositol and D-chiro-inositol may help improve insulin resistance in PCOS, which can modestly support weight management. However, clinical evidence is limited. Most research shows supplements work best alongside dietary changes and exercise, not as standalone solutions. Prescription GLP-1 medications have stronger clinical evidence for weight loss.
Am I eligible for prescription weight loss medication on the NHS with PCOS?
Yes, if your BMI is 30 or above, or 27+ with weight-related comorbidities (PCOS qualifies). However, NHS access depends on referral to specialist services and varies by region. Waiting lists can be long. Your GP can assess your eligibility and discuss both NHS and private options.
How much weight can you lose on Mounjaro or Wegovy?
Clinical trials show average weight loss of 15–21% body weight with Mounjaro and around 15% with Wegovy over 12–18 months, alongside reduced-calorie diet and exercise. Individual results vary significantly. Your actual loss depends on dose, adherence, diet, and activity level. Use our weight loss calculator for personalised projections.
Can I take weight loss supplements alongside prescription GLP-1 medication?
This depends on the specific supplement and medication. Always inform your prescriber of any supplements you're taking. Some may interact with GLP-1 medications or be unnecessary if you're already taking prescription treatment. Your GP or prescriber can advise on safe combinations.
What's the difference between PCOS and general weight management medication eligibility?
PCOS itself qualifies as a weight-related health condition, so you may be eligible at a lower BMI (27+) rather than waiting for BMI 30+. However, the medications available are the same as for general weight management. Your prescriber will assess based on your individual PCOS, weight, and overall health.
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.