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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Glucomannan Dosage For Weight Loss
Glucomannan is a natural soluble fibre supplement that may support weight loss by promoting feelings of fullness and reducing appetite. Unlike prescription weight loss medications such as GLP-1 injections, glucomannan is available over the counter in the UK. This guide explains safe dosing, how it works, and how it fits into an overall weight management strategy alongside a reduced-calorie diet and increased physical activity.
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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.
How Glucomannan Works For Weight Loss
Glucomannan is a water-soluble dietary fibre derived from the konjac plant root. When taken with water, it absorbs liquid and expands in your stomach, creating a viscous gel that may help you feel fuller for longer and eat less at subsequent meals. Unlike prescription weight loss injections, glucomannan does not act on appetite-regulating hormones — it works purely through physical bulk and satiety signalling.
Evidence suggests glucomannan may help with modest weight loss when combined with a reduced-calorie diet. Clinical studies show weight reductions of around 2–3 kg over 8–12 weeks, though individual results vary significantly. Glucomannan also has potential cardiovascular benefits, including modest improvements in cholesterol and blood sugar levels. However, it is far less effective than prescription weight loss medications approved by the NHS for weight management in the UK.
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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.
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Safe Glucomannan Dosage And Usage Guidelines
The standard glucomannan dosage for weight loss in the UK is 1 gram (1,000 mg) taken three times daily, always with at least 200–250 ml of water. Never take glucomannan dry — it must be mixed with adequate liquid to prevent choking or blockage. Take each dose 15–30 minutes before meals to maximise satiety effects.
Start with a lower dose (0.5 grams once daily) and gradually increase over 1–2 weeks to minimise digestive side effects such as bloating and wind. Maximum daily intake should not exceed 3 grams without medical supervision. Pregnant women, people with swallowing difficulties, or those on medications should consult their GP before starting glucomannan. If you have a BMI above 30 or weight-related health conditions, your GP may discuss prescription weight loss options, which are typically more effective than supplements alone.
- 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.
What is the recommended glucomannan dose for weight loss?
The standard dose is 1 gram (1,000 mg) three times daily, always taken with at least 200–250 ml of water. Start lower (0.5 g once daily) and gradually increase to minimise bloating. Never take glucomannan dry, as it can cause choking or intestinal blockage.
How does glucomannan compare to prescription weight loss injections like Mounjaro or Wegovy?
Glucomannan is a over-the-counter fibre supplement that works through physical bulk alone. Prescription GLP-1 medications like Wegovy act on appetite hormones and are significantly more effective — clinical trials show clinically studied weight loss versus 2–3 kg with glucomannan. Prescription medications require a clinical assessment and are suitable for adults with BMI ≥30 or overweight with health conditions.
How long does it take to see weight loss results from glucomannan?
Most people notice modest weight changes after 4–8 weeks of consistent use alongside a reduced-calorie diet and increased physical activity. Individual results vary. Our GLP-1 weight loss calculator can help you compare projected outcomes with prescription medications if you're eligible for them.
Are there side effects or risks with glucomannan?
Common side effects include bloating, wind, constipation, or diarrhoea — usually temporary and reduced by starting with a low dose and drinking plenty of water. Serious risks include bowel obstruction if taken without sufficient liquid. Avoid if you have swallowing difficulties or certain digestive conditions. Consult your GP if taking medications.
Should I try glucomannan or ask my GP about prescription weight loss medication?
If your BMI is 30 or above, or 27–29.9 with weight-related health conditions, your GP can assess you for prescription weight loss treatment, which is more effective. Glucomannan may support general weight management alongside diet and exercise, but is not a substitute for medical assessment. Use our BMI calculator to check your starting point and discuss options with your GP.
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.