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
Free tracker included with every download this week
How to Avoid Hair Loss When Taking Mounjaro
Hair loss is a recognised side effect that some people experience while taking Mounjaro (tirzepatide), a weekly weight loss injection prescribed in the UK. The good news is that there are practical steps you can take to minimise hair loss risk and support hair health during treatment. This guide explains what causes hair loss on Mounjaro, evidence-based prevention strategies, and when to speak to your GP. While individual results vary and not everyone experiences this side effect, being informed helps you take proactive care of your health.
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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.
Why Hair Loss Happens on Mounjaro and Prevention Strategies
Hair loss on Mounjaro (telogen effluvium) typically occurs because:
- gradual weight management triggers a shift in the hair growth cycle, pushing more hairs into the shedding phase
- Nutritional deficiencies from reduced food intake can weaken hair follicles
- The stress response from significant weight change affects hair health
To minimise hair loss while using this weekly weight loss injection, focus on adequate protein intake (aim for 1.6g per kg of body weight), maintain consistent micronutrient levels (iron, zinc, B vitamins), and eat nutrient-dense foods alongside your calorie deficit. Stay hydrated, manage stress through gentle exercise, and avoid harsh hair treatments. Consider a multivitamin with biotin, iron, and zinc after consulting your GP. Hair loss typically peaks around weeks 8–16 of treatment but often improves as your body adjusts.
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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.
UK Mounjaro Access, Cost, and When to Seek Medical Advice
Mounjaro is available in the UK through NHS specialist weight management services and private online prescription routes. Private access typically costs £150–£280 per month depending on your dose and provider, with prices starting lower at the initial 2.5mg dose and increasing as you titrate up. NHS access is free but involves waiting lists that vary significantly by region. If you experience excessive hair loss—shedding noticeably more than 100 hairs daily or visible bald patches—contact your GP immediately. They can assess whether the hair loss is medication-related, check your nutritional status, and discuss whether continuing Mounjaro is appropriate for you. Your prescriber may adjust your dose or suggest additional support.
- 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 hair loss on Mounjaro permanent?
No. Hair loss from Mounjaro (telogen effluvium) is typically temporary and usually resolves within 3–6 months after stopping the medication or as your body adapts. However, if hair loss is severe or persists beyond 6 months, speak to your GP to rule out other causes like nutritional deficiencies or thyroid issues.
How can I prevent hair loss while taking Mounjaro?
Ensure adequate protein intake (1.6g per kg body weight), maintain iron and zinc levels, stay hydrated, manage stress, and avoid harsh hair treatments. Consider a biotin and micronutrient supplement after consulting your GP. Use our BMI calculator to monitor your progress and ensure you're losing weight at a sustainable rate (0.5–1kg per week), which may reduce hair loss risk.
Should I stop taking Mounjaro if I experience hair loss?
Do not stop taking Mounjaro without speaking to your GP or prescriber first. They will assess whether your hair loss is medication-related, check your nutritional status, and help you decide the best course of action. Stopping suddenly without medical guidance can affect your weight management plan and health.
What nutritional supplements help with hair loss on Mounjaro?
Biotin, iron, zinc, vitamin B12, and vitamin D are commonly recommended. However, always consult your GP or a registered dietitian before starting supplements—they can check your current levels via blood tests and recommend appropriate doses. Taking unnecessary supplements may cause interactions with other medications.
Can I use hair loss treatments alongside Mounjaro?
Some treatments like minoxidil (Regaine) may help, but discuss any hair loss product with your GP or prescriber first. They need to check for interactions with Mounjaro and confirm that hair loss is genuinely medication-related. Your GP can also refer you to a dermatologist if needed.
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.