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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Myo Inositol for Weight Loss — What the Evidence Shows
Myo inositol is a naturally occurring compound often discussed in weight loss conversations, particularly for those with polycystic ovary syndrome (PCOS). However, the evidence for myo inositol as a standalone weight loss tool is limited compared to prescription weight loss medications. This guide explains what myo inositol is, what research shows, and how it fits into UK weight loss approaches. If you're exploring options for weight management, your GP can discuss what may be appropriate for your individual health situation.
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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 Is Myo Inositol and How Does It Work?
Myo inositol is a naturally occurring compound found in foods including grains, legumes, and fruits. It plays a role in insulin sensitivity and hormonal regulation in the body. Some research suggests it may help improve insulin resistance, which is relevant for individuals with PCOS or metabolic syndrome.
- Myo inositol is not a medication — it's available as a dietary supplement
- It is believed to work by improving how the body uses insulin
- Unlike prescription weight loss injections, myo inositol has no direct appetite-suppressing mechanism
- Weight loss associated with myo inositol, where observed, is typically modest and linked to improved metabolic health rather than reduced food intake
Research shows mixed results. Some studies suggest myo inositol may support modest weight loss in women with PCOS, whilst others show minimal impact on weight alone. Individual results vary significantly, and weight loss is not assured.
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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.
Myo Inositol vs. Prescription Weight Loss Medications
Unlike prescription weight loss medications such as Wegovy (semaglutide) or Mounjaro (tirzepatide), myo inositol is not licensed for weight loss and does not work through appetite suppression. Clinical trials of GLP-1 weight loss medications show average weight loss of 15–21% of body weight, whereas evidence for myo inositol alone is considerably more limited.
If you're considering options for weight management in the UK, your GP can assess your individual health situation. Prescription weight loss medications require clinical assessment and are available through NHS specialist services or private prescribing. Myo inositol, as a supplement, does not require prescription but also lacks the same level of clinical evidence.
Try our free GLP-1 weight loss calculator to explore potential outcomes with evidence-based prescription medications, or use our BMI calculator to assess your current weight category.
- 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 myo inositol proven for weight loss?
Myo inositol shows modest promise in some studies, particularly for women with PCOS, but evidence is limited compared to prescription medications. Weight loss, where observed, tends to be modest and is often linked to improved metabolic health rather than direct appetite suppression. Individual results vary significantly.
How does myo inositol compare to Wegovy or Mounjaro?
Myo inositol is a supplement without direct appetite-suppressing effects, whereas Wegovy and Mounjaro are prescription GLP-1 medications with clinical trial evidence showing 15–21% average body weight loss. Prescription medications require clinical assessment and a prescription from a licensed prescriber.
Can I get myo inositol on the NHS?
Myo inositol is not typically prescribed on the NHS as it is a dietary supplement rather than a medication. It's available to purchase privately. If you're interested in prescription weight loss treatment, your GP can refer you to NHS specialist weight management services.
Who should consider myo inositol for weight loss?
Myo inositol may be most relevant for women with PCOS experiencing insulin resistance. However, any consideration of supplements should involve discussion with your GP, especially if you take other medications or have underlying health conditions.
What's the difference between myo inositol and D-chiro inositol?
Myo inositol and D-chiro inositol are different forms with different proposed effects. Research on myo inositol for PCOS and weight management is more established than for D-chiro inositol, though both show mixed results. Your GP can advise which, if either, might be appropriate for you.
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.