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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Keto Drops For Weight Loss — What UK Adults Need To Know
Keto drops are marketed as weight loss supplements, but there's no robust clinical evidence that they work. If you're interested in weight management in the UK, prescription medications like Mounjaro and Wegovy have strong clinical evidence behind them. This guide explores what keto drops actually are, why prescription weight loss medication might be more effective, and how to access evidence-based weight loss support through the NHS or private prescribers. Our free BMI calculator can help you understand your starting point.
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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.
UK-Licensed Prescription Weight Loss Options
If you're looking for effective weight management in the UK, prescription medications have far more clinical evidence than keto drops. The main options available are:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist. Clinical trials showed participants lost an average of 15–21% of body weight over 72 weeks alongside reduced-calorie diet and increased physical activity.
- Wegovy (semaglutide) — a GLP-1 receptor agonist. STEP clinical trials demonstrated approximately 14.9% average body weight loss at the maximum dose.
- Saxenda (liraglutide) — a once-daily GLP-1 injection. Evidence shows similar weight loss outcomes to Wegovy.
All three are prescription-only medicines requiring clinical assessment. Individual results vary significantly. They work by regulating appetite and supporting feeling fuller after smaller meals. Our free GLP-1 weight loss calculator can help you explore potential outcomes at different doses.
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
NHS route: Weight loss medications are available through specialist tier 3 weight management services, typically accessed via GP referral. Availability varies significantly by region and ICB (Integrated Care Board). NHS waiting lists for specialist services can be lengthy in many areas.
Private route: GPhC-registered online prescribers can issue prescriptions following a clinical assessment, without NHS referral. This is faster but involves private costs (typically £129–£320 monthly depending on dose and provider).
Either way, speak to your GP about your weight management goals. They can assess eligibility based on your BMI and any weight-related health conditions like type 2 diabetes or high blood pressure. Use our free weight converter and BMI calculator to understand your personal context before your appointment.
- 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 are keto drops and do they work for weight loss?
Keto drops are supplements marketed to support ketogenic diets, typically containing ingredients like beta-hydroxybutyrate (BHB). There is no robust clinical evidence that keto drops lead to meaningful weight loss. They're not regulated as strictly as medications, and results are largely anecdotal. Prescription weight loss medications have far stronger clinical evidence.
Are prescription weight loss injections available on the NHS in the UK?
Yes. Mounjaro, Wegovy, and Saxenda are all available through NHS specialist weight management services (tier 3). Access requires GP referral and eligibility assessment. Availability varies by region, and waiting lists can be several months to over a year in many areas. Your GP can check eligibility based on your BMI and health conditions.
Who is eligible for prescription weight loss medication in the UK?
Adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease, sleep apnoea) may be eligible. South Asian, Chinese, Black African, and Black Caribbean adults have lower thresholds. A prescriber will assess your individual circumstances.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) activates two hormone pathways (GIP and GLP-1), whilst Wegovy (semaglutide) activates one (GLP-1). Mounjaro showed slightly higher average weight loss in clinical trials (~15–21% vs ~15%). Both are once-weekly injections. Individual responses vary, and a prescriber will recommend based on your health profile.
How quickly can I get weight loss medication in the UK?
NHS access typically involves waiting several weeks to months for specialist referral and assessment, depending on your region. Private prescribers can often issue prescriptions within days following an online clinical consultation. Cost and speed are trade-offs — NHS is free but slower; private is faster but involves out-of-pocket expense.
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.