Mounjaro hair loss is uncommon but recognised: it was reported by 4.9% of tirzepatide patients in pooled weight-management trials, compared with 1.0% on placebo. It was usually mild, and most people recovered while continuing treatment. Speak to your prescriber rather than stopping Mounjaro or changing your dose yourself.
The precise cause is not fully understood. Rapid weight loss, reduced food intake and the physical stress of change may all contribute, sometimes triggering temporary shedding known as telogen effluvium.
Can Mounjaro Cause Hair Loss?
Mounjaro was originally developed for type 2 diabetes. Like semaglutide—the ingredient used in Ozempic and Wegovy—tirzepatide was also found to affect appetite and weight, leading to its use in weight management. Hair loss can happen while taking Mounjaro for weight management.
In the pooled SURMOUNT-1, -2 and -3 weight-management studies, 4.9% of participants taking tirzepatide reported hair loss, compared with 1.0% receiving a placebo. The events were mainly mild, and most affected participants recovered while continuing treatment. The studies show an association, but they do not establish that tirzepatide directly damages hair follicles.
Why Might Hair Shedding Happen?
One possible explanation is telogen effluvium. This happens when a physical or emotional shock disrupts the natural hair growth cycle, causing more hairs than usual to move into the resting and shedding phases together.
Weight loss and dieting are recognised triggers. A 2024 clinical investigation documented telogen effluvium following weight loss, supporting the view that rapid or substantial weight loss may contribute to increased shedding.
Changes in appetite can also make it harder for some people to get enough protein, iron and other important nutrients. However, this does not mean everyone taking Mounjaro will become deficient—or that every case of hair loss is telogen effluvium. Iron deficiency, thyroid conditions, genetic hair loss and other unrelated causes may also be responsible, so persistent or severe shedding deserves professional assessment.
Our earlier guide explores the wider relationship between weight-loss injections and hair loss.
What Does Mounjaro Hair Loss Look Like?
A 2025 analysis found that people taking tirzepatide had a greater risk of being diagnosed with telogen effluvium than those using other weight-loss medications. This does not prove that Mounjaro directly causes the condition, but it provides another clue about the type of hair loss some users experience.
Telogen effluvium generally causes increased shedding from across the scalp rather than one clearly defined bald patch. You might notice more hair than usual in the shower, on your brush or on your clothes. It often becomes noticeable around three months after a trigger, but that does not necessarily mean three months after starting Mounjaro. Our guide to sudden hair thinning in women explains other possibilities.
Will Your Hair Grow Back?
Across the pooled SURMOUNT-1, -2 and -3 data, most participants who experienced hair loss recovered while continuing treatment. Recovery can still be gradual. Where the shedding is telogen effluvium, the active shedding phase commonly lasts between three and six months. Regrowth may begin during that time, but it can take several more months for fullness to improve and longer to regain lost length.
A consistent routine combining good nutrition with gentle hair and scalp care can help protect the hair you have while your hair cycle settles.
What Can You Do to Support Your Hair?
- Speak to your prescriber. Do not stop Mounjaro or change your dose independently. Your prescriber can consider your rate of weight loss, diet, symptoms and other possible causes.
- Nourish your body. Aim for a balanced diet with suitable sources of protein, iron and other nutrients. If reduced appetite makes this difficult, discuss your diet and any proposed supplements with your GP, pharmacist or dietitian.
- Avoid guessing at deficiencies. Your GP may recommend blood tests if iron deficiency, thyroid problems or another condition is suspected. Read more about iron deficiency and hair loss.
- Be gentle with your hair. Reduce tight styles, extensions, excessive heat and harsh chemical treatments to help protect existing hair from additional breakage.
If you are worried about hair loss, especially when it is sudden or severe, speak to your GP or consult a trichologist.
Supporting Your Hair From the Inside Out
Hair Gain products do not treat hair loss as a side effect of Mounjaro. If your appetite or diet has changed, speak to your GP, pharmacist or dietitian before adding a supplement. Hair Gain Capsules and Hair Gain Gummies contain AnaGain™—an ingredient derived from organic pea shoots. In a peer-reviewed study of AnaGain, 100mg daily was associated with reduced hair shedding after 28 days. The formulas also contain biotin and zinc, which contribute to the maintenance of normal hair. This ingredient research is separate from medical guidance on Mounjaro-related hair loss.
Care from the outside matters too. Hair Gain’s Hydrating Shampoo and Conditioner gently cleanse and hydrate the hair and scalp. The Scalp Foam is designed to moisturise the scalp, while the Hair Mask helps hydrate and condition the hair. Used together as a cosmetic haircare regime, the foam and mask were independently tested and showed up to 60% less hair breakage and fall from the first use.* This product testing is separate from evidence about Mounjaro-related shedding.
Frequently Asked Questions: Mounjaro Hair Loss
How common is hair loss on Mounjaro?
In the main weight-management studies, hair loss was reported by 4.9% of people taking tirzepatide, compared with 1.0% taking a placebo.
When does Mounjaro hair loss start?
There is no universal timeline. Where the shedding is telogen effluvium, it may appear around three months after the relevant trigger rather than three months after starting Mounjaro.
Is Mounjaro hair loss permanent?
Most affected participants in the trials recovered, but experiences vary. If the cause is telogen effluvium, regaining previous volume may take many months.
Should I stop taking Mounjaro if my hair starts falling out?
Do not stop Mounjaro or change your dose without speaking to your prescriber. They can assess your shedding, investigate other causes and advise you appropriately.
Can supplements support your hair while taking Mounjaro?
A supplement cannot treat Mounjaro-related hair loss. If changes in appetite make it harder to eat as well as usual, ask your GP, pharmacist or dietitian whether nutritional support is appropriate for you. As Mounjaro is a prescription medicine, check before adding a new supplement to your routine.
Read More
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*Independently tested May 2023; results achieved when tested as a regime.
