Weight loss injections have become a popular choice for people seeking effective, clinically guided support on their weight loss journey. While medications like Mounjaro, Wegovy, Saxenda, and Orlistat have shown promising results, many individuals share a common concern which is weight loss injections causing hair loss.
If you’re noticing more hair on your brush, or you’re curious about the risks before starting treatment, this guide explains the link between Mounjaro and thinning hair, why it may happen, and five proven ways to combat it.
Understanding Mounjaro and Weight Loss Injections
Mounjaro (tirzepatide) belong to a group of medications known as GLP-1 receptor agonists. These medications mimic a natural hormone in the body that regulates appetite, slows gastric emptying, and maintains blood sugar levels.
These medicines are widely offered across UK pharmacies, including Batley Pharmacy, for patients who haven’t achieved adequate weight loss with lifestyle changes alone. Clinical trials show they can support significant weight reduction. But with rapid weight loss comes a higher risk of temporary hair shedding, regardless of which medication is used.
The Link Between Weight Loss and Hair Loss
Why does hair loss happen during rapid weight loss?
Regardless of how the weight is lost, hair shedding can occur when the body undergoes sudden changes or stress. This type of hair loss is typically referred to as telogen effluvium (TE), a temporary condition where more hairs than usual shift into the resting (telogen) phase and eventually shed.
Clinical studies show that telogen effluvium (TE) triggered by weight loss typically occurs after an average weight reduction of around 15.21% or a weight loss rate of approximately 3.54 kg per month.
Does Mounjaro Cause Hair Loss?
Mounjaro itself does not directly cause hair loss, but hair thinning can occur as a result of rapid weight loss or nutritional stress while using the medication.
What the research says:
- A 2022 study found that 5–6% of people taking tirzepatide (Mounjaro) reported hair thinning.
- Weight-loss-related TE often appears after losing around 15% of body weight or after losing 3.5 kg per month.
These findings show the association is more about the speed and scale of weight loss, not the medication directly damaging hair follicles.
Hair Loss from Weight Loss Injections
Is hair thinning a side effect of GLP-1 medications?
Hair thinning on Mounjaro or Wegovy has been reported by some users, but current clinical data do not list hair loss as a direct side effect of GLP-1 medications. However, rapid or significant weight loss, nutritional deficiencies, hormonal changes, and physical or emotional stress during treatment could trigger or exacerbate shedding.
Not all individuals experience hair loss from weight loss injections, and the degree of shedding can vary from person to person.
Batley Pharmacy offers weight loss injections after you have an assessment from our expert team to ensure suitability. Book your consultation today if you have just started your weight loss journey or have any ongoing concerns about GLP-1 medications.
Wegovy vs Mounjaro: Which Causes More Hair Loss?
Both Wegovy and Mounjaro can be linked with temporary hair shedding, but neither lists hair loss as a direct clinical side effect.
What varies is the degree of weight loss:
- Mounjaro typically leads to more rapid and larger weight reduction with a higher chance of TE.
- Wegovy causes slightly slower weight loss so risk is still there, but may be lower for some users.
Ultimately, any significant or sudden weight change, regardless of the drug, can stress the body enough to trigger shedding.
Factors That May Contribute to Hair Thinning on Mounjaro
- Rapid weight loss
Losing a significant amount of weight in a short period puts the body under stress. - Caloric restriction
Strict dieting can lead to inadequate protein, iron, biotin, or zinc intake. - Hormonal shifts
Changes in insulin, thyroid, or cortisol levels can affect hair growth cycles. - Medication stress
Any new medication or change in health can induce stress on the body. - Underlying conditions
Thyroid disorders, PCOS, or anaemia can also contribute to hair thinning.
How Long Does Hair Shedding Last After Starting Weight Loss Injections?
If the hair loss is indeed due to telogen effluvium, it typically begins 2 to 3 months after the triggering event. Shedding may continue for several weeks to a few months, but the good news is that this type of hair loss is usually temporary. Regrowth can start once the body stabilises.
A Phase 3 trial in adults using semaglutide over 104 weeks showed a 15% weight loss. Approximately 3% of them reported alopecia. While not all cases were specified as telogen effluvium, reversibility was indicated.
A 2022 study showed that about 5 to 6% people taking tirzepatide (5 to 15 mg) showed hair loss or thinning.
Some individuals may experience slower or incomplete regrowth if there are other underlying causes, such as thyroid disorders, iron deficiency, or stress. That is why early nutritional and medical support is essential during any weight loss journey.
Can Hair Loss from Weight Loss Injections Be Reversed?
Yes, in most cases. Once the body adapts to the new weight and nutritional needs are corrected, hair regrowth can occur naturally over time. It is essential to act early. Addressing deficiencies, reducing stress, and maintaining a healthy routine can speed up recovery.
5 Best Ways to Combat Hair Loss on Mounjaro
1. Prioritise Nutrition
Get enough protein, iron, zinc, biotin, and vitamin D. Nutrient deficiencies are common causes behind hair loss. Consider consulting a pharmacist or nutritionist to review your dietary intake.
2. Avoid Extreme Calorie Cuts
Gradual weight loss is better for long-term success and for your hair. Severe calorie restriction increases the risk of hair shedding.
3. Supplements
Multivitamins or specific hair-support supplements can help fill in nutritional gaps. Always check with your healthcare provider before starting any supplement.
4. Manage Stress
Emotional and physical stress can contribute to hair loss. Make time for relaxation techniques, sleep, and self-care.
5. Monitor Your Health
Regular check-ins with your doctor or pharmacist can help detect early signs of nutritional imbalances or other underlying issues.
Which Supplements Can Help Combat Hair Loss?
If GLP-1 medications are causing hair thinning, consider these nutrients:
- Biotin – Essential for keratin production
- Iron – Especially important for women
- Zinc – Vital for tissue growth and repair
- Vitamin D – Supports overall hair follicle function
- Protein supplements – Helpful if consuming less than daily protein requirement
Batley Pharmacy offers a range of high-quality supplements that can be safely used alongside weight loss treatments. Speak to our team for personalised recommendations.
Mounjaro Side Effects After Eating: Can They Affect Hair?
Common side effects after eating include:
- Nausea
- Reduced appetite
- Early fullness
- Bloating
- Indigestion
These symptoms may lead to lower calorie or protein intake, which is a key trigger for hair thinning. So while digestive side effects don’t directly cause hair loss, they can indirectly contribute if they reduce your nutrient intake.
Final Thoughts: Balancing Weight Loss and Hair Health
Weight loss injections causing hair loss is a concern for many, but it is not usually a direct side effect of the medication itself. Instead, it often results from rapid weight loss or dietary imbalances. The key is early intervention, good nutrition, and ongoing medical support.
If you are considering or already using Mounjaro, Wegovy or Saxenda and are worried about hair loss, Batley Pharmacy is here to help. Our expert team can offer advice on how to protect your hair while achieving your weight loss goals.
FAQs
Does Wegovy cause hair loss?
Wegovy is not directly linked to hair loss in clinical trials, but rapid weight loss while using it may lead to temporary shedding.
Why am I losing hair during weight loss?
Rapid weight loss, stress, or nutrient deficiencies are common reasons for hair loss during weight reduction.
How to stop hair loss while losing weight?
Prioritise nutrition, avoid extreme dieting, and consider taking supplements under professional guidance.
Why does hair loss happen during rapid weight loss?
It is often due to telogen effluvium, a condition triggered by physiological stress on the body, and rapid weight loss contributes to this condition.
Is hair thinning a side effect of GLP-1 medications?
Hair thinning is not recognised as a side effect of GLP-1 medications, but it has been reported among a few individuals.
Can hair loss from weight loss injections be reversed?
Yes, most cases of shedding are temporary and improve with proper nutrition, reduced stress, and lifestyle changes.
How long does hair shedding last after starting weight loss injections?
It typically starts within 2–3 months and lasts for a few weeks to several months.
What are the best ways to prevent hair loss during weight loss treatment?
Focus on balanced meals, adequate protein, supplements, and routine health check-ins.
Should I Stop Taking Weight Loss Injections if I Notice Hair Thinning?
Not necessarily. For many people, the benefits of weight loss injections outweigh temporary hair concerns. However, if hair loss becomes severe or distressing, consult with your prescriber. They may adjust your dose, assess your nutritional status, or explore alternatives.
Which supplements can help combat hair loss?
Biotin, zinc, iron, vitamin D, and protein are key supplements that support hair health.
Is hair loss permanent with Wegovy, Saxenda, or Mounjaro?
In most cases, hair loss is not permanent, and regrowth is possible.
Can protein or nutrient deficiency worsen hair loss on injections?
Yes. Deficiencies can make the problem worse, so nutritional support is vital.
Should I stop taking weight loss injections if I notice hair thinning?
Not automatically. Speak to your healthcare provider to weigh the risks and benefits.
