Mounjaro is becoming a popular option for weight loss support in the UK, especially for people who haven’t had success with diet and exercise alone. But as more people begin using this weekly injection, concerns about side effects—particularly hair loss from Mounjaro—are starting to emerge.
If you’ve noticed changes in your hair or are worried about shedding while using Mounjaro, you’re not alone. This guide, prepared by Ashcroft Pharmacy, offers clear and helpful advice to understand what’s happening and how to manage it confidently.
1. What Is Mounjaro and Why Is Hair Loss Being Reported?
Mounjaro (tirzepatide) is a prescription GLP-1 medication used for managing type 2 diabetes and, increasingly, for weight loss. It works by controlling blood sugar and helping users feel fuller for longer, which reduces appetite and calorie intake.
While Mounjaro wasn’t originally designed for weight loss, it has shown promising results. However, some people have reported hair thinning or increased shedding during treatment. Why? Rapid weight loss, hormonal changes, or shifts in nutritional intake may stress the body enough to temporarily affect the hair growth cycle. This condition is known as telogen effluvium.
Is Hair Loss a Common Side Effect?
Hair loss isn’t listed as an official side effect in clinical trials for Mounjaro. However, anecdotal reports—especially in online forums and patient communities—suggest that some users do experience noticeable hair shedding after starting treatment.
This side effect is also seen in users of similar GLP-1 medicines, like Ozempic and Wegovy, which supports the idea that it could be connected to sudden metabolic shifts and weight loss, not the drug itself.
In most cases, the hair loss is temporary and reversible.
Who Is Most Likely to Experience It?
Anyone using Mounjaro injection pens may notice changes in their hair. However, some people seem more at risk:
- Women, especially those already prone to hair thinning
- Individuals experiencing rapid weight loss (e.g. more than 1–2 kg/week)
- People with low protein intake, vitamin deficiencies, or stress
- Non-diabetics using Mounjaro purely for slimming without GP supervision
If you fall into any of these groups, it’s worth monitoring your hair health from the start.
What Does Hair Loss Look Like for Mounjaro?
Most users describe diffuse thinning—hair falling out more than usual while brushing or washing. It may appear across the whole scalp, but often affects the crown, temples, or parting area.
Importantly, this is not the same as patchy bald spots or alopecia. The follicles are not permanently damaged, and regrowth is likely once the body adjusts to the new medication and weight stabilises.
Hair loss typically starts around 1 to 3 months after beginning treatment.
How Long Does It Last and Will It Stop?
In most cases, Mounjaro-related hair loss is temporary. Once your body adapts to weight changes and any nutrient imbalances are corrected, hair growth usually resumes.
The average recovery time is around 3 to 6 months, but it can vary depending on your overall health and lifestyle. You may also notice baby hairs regrowing around the hairline or scalp as an early sign of recovery.
How to Reduce or Prevent Hair Loss While on Mounjaro
You can take steps to protect your hair during your weight loss journey. Here’s what we recommend at Ashcroft Pharmacy:
- Eat enough protein – Hair is made of keratin, which needs protein to grow
- Get your iron, B12, and zinc checked – Deficiencies are linked to thinning
- Consider supplements – Biotin, collagen, or a general multivitamin may help
- Be gentle with your hair – Avoid heat styling, tight styles, or harsh brushing
- Use scalp-friendly shampoos – Mild formulas with caffeine, rosemary, or niacinamide can support hair health
- Manage stress – Sleep, mindfulness, and staying hydrated all make a difference
Always consult your GP or pharmacist before adding any new supplement to your routine.
Should You Stop Taking Mounjaro If You Notice Hair Loss?
Not necessarily. While hair loss can be worrying, the benefits of Mounjaro—especially for those with obesity or uncontrolled diabetes—may outweigh this temporary side effect.
Never stop taking Mounjaro without medical advice. Instead, speak to your prescriber. They may:
- Adjust your dose
- Check for underlying nutritional issues
- Recommend temporary supplements or dietary changes
Balancing your overall health with cosmetic concerns is key.
When to Speak to a Doctor or Pharmacist
While mild hair shedding is often manageable, it’s important to get help if you notice:
- Hair falling out in clumps
- Bald patches or receding hairline
- Other symptoms like fatigue, brittle nails, or mood changes
- No improvement after 6 months
Your GP or an NHS-recognised provider like Ashcroft Pharmacy can help identify if Mounjaro is the cause—or if something else is going on.
Conclusion & Ashcroft Pharmacy Support
While Mounjaro hair loss can be frustrating, it’s usually temporary and can be managed with the right care. If you’re noticing thinning or just want to take early steps to protect your hair, you’re not alone.
At Ashcroft Pharmacy, we’re here to offer trusted advice, safe prescribing, and ongoing support during your treatment. We’re an NHS-recognised UK online pharmacy, and you can always reach out with questions or concerns.