Hi, it’s Nima here. Today I’m diving into a question I’ve seen a lot - “Does Mounjaro cause hair loss?”.

If you’re using Mounjaro (or considering it) and have noticed more hair in the brush, more shedding, or general hair thinning, this one’s for you. We’ll look at what the latest evidence says about side effects of Mounjaro, especially when it comes to hair thinning and hair shedding, why it happens, and what you can do to protect your hair while still working on your goals. Remember, you can embrace your natural beauty, feel confident, and Never Stop Growing, even when changes are happening.

What Is Mounjaro & What Are Its Known Side Effects?

First, a quick refresher. Mounjaro (aka Tirzepatide) is a medication originally approved for type 2 diabetes and now increasingly used, under medical supervision, for weight management. It works by mimicking gut hormones (GLP-1/GIP) to reduce appetite and slow digestion.

When we talk about the side effects of Mounjaro, common ones include digestive symptoms like nausea, vomiting, diarrhoea or constipation.

Another important topic is what happens when you stop taking Mounjaro? Some people experience withdrawal symptoms, appetite return, weight regain or other metabolic shifts when discontinuing. So if you’re on Mounjaro, stopping it is a decision to discuss with your healthcare provider.

And of course, Mounjaro weight loss side effects is a broad category and ever-changing given the fact that the medication is fairly new to market, so evidence and details of side effects are still developing.

Does Mounjaro Cause Hair Loss?

Yes, hair loss can happen, but it is not directly linked to the medication itself - here’s what we know...

• Studies show 4.9-5.7% of people taking Mounjaro report dealing with hair loss
• Hair Loss is more likely caused by life changes linked to the medication, such as hormonal changes, rapid weight loss and nutrient deficiency.
• Most people see hair regrowth within 3–6 months once things stabilise.

So let’s break down the direct causes that can be caused by Mounjaro…

Rapid Weight Loss

When you lose body weight quickly, your body sees it as a form of physical stress. This stress on your body can have an effect on the hair cycle, forcing hair follicles to move from the growing phase (anagen) into the resting/shedding phase (telogen). That sudden shift can cause noticeable hair shedding a couple of months later, so if you’ve been taking Mounjaro and losing weight for a couple of months now and are starting to notice hair loss, it could be down to this.

Lack of Nutrients

If you’re in a calorie deficit (which often happens alongside weight-loss injections), you may not get enough protein, Iron, Zinc, Biotin, Vitamin D, etc. These nutrients are essential for healthy hair growth. When they’re missing, hair shedding or thinning can happen. 

Hormonal Shifts

Losing weight can have an impact on hormones, whether it be thyroid function, oestrogen/testosterone balance, cortisol (stress hormone). These hormonal changes can have an impact on the hair growth cycle.

So, when someone experiences hair loss or hair thinning while using Mounjaro, it’s usually the convergence of multiple factors, rather than “the injection attacked my hair”.

How To Stop Hair Loss On Mounjaro – Practical Tips For Healthy Hair

If you’re taking Mounjaro and noticing more hair in the brush or a thinner ponytail, here’s a roadmap of what you can do. The goal is to support hair health while continuing your growth journey with confidence.

Focus On Nutrition

• Ensure you’re eating enough protein. Hair is made up of around 80-85% Keratin, a type of protein, so it’s important to keep your levels up to keep your hair strong!
• Make sure you get solids of Iron, Zinc, Biotin, Vitamin D and Selenium. For example, lean meat, beans, lentils, eggs, nuts, seeds, leafy greens. If you feel as though you’re still not getting enough through your meals, why not try a supplement, like our Hair Vitamins, which are packed with Vitamin C, A and Biotin, alongside other important nutrients that can help boost hair health!
• Don’t go too low-calorie too fast. A slower, steady weight loss can reduce the odds of hair loss. Aim for something realistic rather than rapid drop-off.  
• Stay well-hydrated. Water supports scalp health and helps to get nutrients where they need to be in your body.

Upgrade Your Hair Care Routine & Scalp Support

• Avoid tight hairstyles, excessive heat styling or harsh chemical treatments when your hair is under stress.  
• Use a gentle Shampoo and Conditioner, like those at UKLASH
• Focus on scalp health, by using a pro-active Hair Serum daily alongside either gentle scalp massaging or microneedling.
• If you notice hair shedding, resist the urge to over-wash or over-treat, your hair needs support not more trauma.

Lifestyle & Stress Management

• Prioritise quality sleep. Hormone regulation and tissue repair happen when you’re resting.
• Use stress-reducing practices. Although it can be easier said than done, doing all you can to minimise stress will help. Try to adopt mindfulness in your everyday, breathing exercises and gentle movement. Stress can aggravate shedding.  

Monitor & Consult

• If hair loss continues beyond 3-6 months, or you notice patchy bald spots, brittle nails, fatigue or other symptoms, it could point to an underlying issue (thyroid, nutrient deficiency, hormonal imbalance). Ask your GP to check.  
• If you’re concerned about the dose of Mounjaro (maybe you’re losing weight super rapidly) talk to the prescribing clinician about whether a slower approach is possible (which might reduce risk of shedding).

Is Hair Loss a Reason To Stop Mounjaro?

Generally, no. Hair loss alone is not usually a medical reason to stop the medication if the need for the weight-loss/diabetes treatment remains. Hair shedding on Mounjaro is often temporary and reversible.  

However, if the shedding is severe, prolonged or you have other concerning symptoms, a review with your doctor is warranted to weigh risks with benefits and explore alternatives.

If you’re using Mounjaro and thinking “is this hair loss Mounjaro related?”, here’s what I want you to remember.

Hair shedding or thinning can happen while using the medication, but in most cases, it’s a response to the rapid changes your body is going through rather than the injection itself. The encouraging news is that this type of shedding is often temporary, with regrowth returning once your weight and nutrient intake stabilise.

Supporting yourself with balanced nutrition, steady hydration, gentle hair care and stress management can make a meaningful difference, and taking a slower approach to weight loss can also help reduce the risk of shedding.

If you find that the hair loss continues beyond six months, becomes patchy or is paired with other symptoms like fatigue or brittle nails, it’s worth checking in with your doctor to rule out underlying causes.

Most importantly, be kind to yourself. You are more than your hair or what number shows up on the scales, it’s all about making you feel confident and helping you to feel healthier, bolder and stronger at every stage. Your journey is uniquely yours, and I hope you carry the reminder with you to Never Stop Growing.