- What are GLP-1 medicines?
- Do GLP-1 medicines cause hair loss?
- Why does hair fall out during weight loss?
- How common is hair loss with the different medicines?
- When does the hair loss stop, and will it grow back?
- Other ways of losing weight and your hair
- What can you do about hair loss during weight loss?
- How Neofollics can support you
- Frequently asked questions
- Sources
Losing weight with medication is becoming more common. Medicines such as semaglutide and tirzepatide help many people lose a significant amount of weight. A few months after starting, some notice something they did not expect: noticeably more hair is falling out. In the shower, on the pillow, in the hairbrush.
We understand how unsettling this can be, especially at a time when you are working on your health. In this article, you will read what 2026 research says about GLP-1 medicines and hair loss. You will also learn why it happens and how long it usually lasts. And what you can do yourself to support your hair.
In short
- New studies from 2026 show that hair loss is more common in people who use GLP-1 medication. The absolute risk remains small.
- In most cases it is telogen effluvium: temporary, diffuse hair loss that starts around 2 to 4 months after a major change in the body.
- Rapid weight loss and a lower intake of nutrients are the most likely explanations.
- In most cases, hair recovers once your weight is stable. This does take 6 to 12 months.
- Never stop your medication on your own. Discuss hair loss with your doctor.
What are GLP-1 medicines?
GLP-1 is a hormone your body produces after eating. It makes you feel full sooner and slows down how quickly your stomach empties. GLP-1 receptor agonists mimic this hormone. As a result, you feel less hungry and naturally eat less.
These medicines are only available on prescription. There are several variants, each with its own active substance, form and approved use:
| Active substance | Known as | Form | Approved for |
|---|---|---|---|
| Semaglutide | Ozempic | Weekly injection | Type 2 diabetes |
| Semaglutide | Wegovy | Weekly injection or daily tablet | Weight management |
| Semaglutide | Rybelsus | Daily tablet | Type 2 diabetes |
| Tirzepatide | Mounjaro | Weekly injection | Type 2 diabetes and weight management |
| Liraglutide | Saxenda, Victoza | Daily injection | Weight management (Saxenda), type 2 diabetes (Victoza) |
Tirzepatide acts on two hormones: GLP-1 and GIP. That is why it is often grouped with GLP-1 medicines. The tablet form of Wegovy has been approved in the EU since July 2026. Which medicine is suitable, and for whom, is always decided by your doctor.
Do GLP-1 medicines cause hair loss?
For a long time, the answer was: not directly. Hair loss was mainly seen as a result of rapid weight loss. Recent research adds nuance to that picture.
- The BMJ (July 2026). Researchers followed more than 50,000 adults with type 2 diabetes. People using a GLP-1 medicine developed non-scarring hair loss more often than people using another diabetes medicine. The risk was 37% higher than with SGLT-2 inhibitors and 68% higher than with DPP-4 inhibitors. In absolute numbers, this was around 7 cases per 1,000 people per year, compared with 4 to 5 in the comparison groups (Tang et al., 2026).
- JAAD International (February 2026). A study of nearly 550,000 patients found a higher risk of telogen effluvium and of hereditary hair loss (androgenetic alopecia) after 12 months. The link remained after adjusting for age, sex, BMI and diabetes (George Washington University, 2026).
Two caveats. These are observational studies: they show a link, not proven cause and effect. And the absolute risk is small: most users do not experience noticeable hair loss.
Why does hair fall out during weight loss?
Every hair goes through a fixed cycle: a growth phase of several years, a short transition phase and a resting phase of around 3 months. After that, the hair falls out and a new one grows in its place. Normally, about 10% of your hairs are in the resting phase.
A major change in your body can push a much larger share of your hairs into the resting phase at the same time. This is called telogen effluvium. Because the resting phase lasts a few months, you only see the effect later. That is why many people do not connect it with their weight loss.
With GLP-1 medication, several factors come together:
- Rapid weight loss. Your body experiences a fast drop in weight as stress. In studies, a large share of users lost more than 10 to 15% of their body weight (Wilding et al., 2021).
- Fewer nutrients. You eat less, and so you often take in less protein, iron, zinc and vitamin D. Hair follicles are very active and respond quickly to deficiencies.
- A possible direct effect. Because the link remains in some studies after adjusting for BMI, researchers do not rule out a direct effect of the medicine. This has not yet been clarified.
Read more about telogen effluvium and about weight loss and hair loss in general.
How common is hair loss with the different medicines?
In the large weight loss studies, around 3% of people on semaglutide 2.4 mg reported hair loss, compared with 1% in the placebo group. For tirzepatide at the highest dose, it was around 5%, compared with 1% on placebo. The patient leaflets for Wegovy and Mounjaro list hair loss as a common side effect.
Notably, women report it far more often than men. With semaglutide, it affected around 4% of women compared with less than 1% of men. This matches what we know about telogen effluvium, which is generally more common in women.
When does the hair loss stop, and will it grow back?
With telogen effluvium, the hair follicle stays intact. In principle, the hair grows back. The usual course:
- 2 to 4 months after rapid weight loss begins, the increased shedding starts.
- The shedding usually lasts a few months and decreases once your weight stabilises.
- New hairs grow around 1 cm per month. It therefore often takes 6 to 12 months before your hair regains its previous volume.
Does the shedding last longer than six months, is your hair thinning in specific areas (such as the crown or temples), or do you see bald patches? Then something else may be going on, such as hereditary hair loss that has become more visible through weight loss. In that case, have it assessed by your GP or a dermatologist.
Other ways of losing weight and your hair
GLP-1 medicines are not the only way of losing weight that can affect your hair.
- Weight loss surgery. After bariatric surgery, more than half of people are estimated to experience hair loss, mainly in the first year. Young women and people with low levels of zinc, folic acid and ferritin are most at risk (Zhang et al., 2021).
- Orlistat. This medicine reduces the absorption of fat from your diet. As a result, you also absorb fewer fat-soluble vitamins, such as vitamin D. A deficiency can contribute to hair loss.
- Crash diets and meal replacements. Very few calories or too little protein is a known cause of telogen effluvium, even without medication.
- "Natural alternatives". Supplements such as berberine are sometimes called "nature's Ozempic" online. They do not work in the same way as GLP-1 medication, and the evidence for weight loss is limited. If you already take medication, always check with your doctor or pharmacist first, as some supplements can interact with it.
- Medicines bought outside the pharmacy. Health authorities in Europe, including the Dutch Health and Youth Care Inspectorate, strongly warn against counterfeit weight loss pens and so-called "research peptides" sold online. You do not know what they contain, and in 2026 people were hospitalised as a result. Only use medication prescribed by your doctor and supplied by a pharmacy.
What can you do about hair loss during weight loss?
Do not stop your medication on your own. Discuss hair loss with the doctor who prescribed it. Sometimes a slower dose increase or a different pace of weight loss can help.
There is also a lot you can do yourself to support your hair:
- Eat enough protein. Hair is largely made of keratin, a protein. Especially when you eat less, it is important to include a source of protein at every meal. A dietitian can help you get this right. Read more about protein for hair growth.
- Have your blood checked. Ask your doctor about your ferritin (iron stores), vitamin D, zinc and vitamin B12. Address any deficiencies in a targeted way. More about iron deficiency and hair loss and vitamin D and hair loss.
- Lose weight gradually. A steady pace is better for your hair than the fastest possible drop.
- Be gentle with your hair and scalp. During this period, avoid bleaching, perms and tight hairstyles. Use a gentle, sulphate-free shampoo and take care with hairdryers and straighteners.
- Be patient. Hair grows slowly. Expect a visible difference only after a few months, and track your progress with photos in the same light.
How Neofollics can support you
Neofollics has put together a Telogen Effluvium routine for the period after a trigger such as rapid weight loss. The routine consists of the Hair Growth Stimulating Shampoo, the Hair Growth Stimulating Conditioner and the Hair Growth Supporting Tablets. The shampoo and conditioner are formulated with scientifically proven ingredients that support the scalp and hair growth, and fit easily into your daily care.
The Hair Growth Supporting Tablets contain vitamins, minerals and plant extracts for healthy hair. Do you take medication, such as a GLP-1 medicine? Then check with your doctor or pharmacist first before starting a food supplement.
Not sure which products suit your situation? Start quiz and find your routine.
Frequently asked questions
Does everyone get hair loss from GLP-1 medication?
No. Most users do not experience noticeable hair loss. In weight loss studies, it affected a few percent of participants, more often women and people who lost a lot of weight quickly.
When does hair loss stop after weight loss?
The shedding usually decreases a few months after it starts, once your weight stabilises. Full regrowth often takes 6 to 12 months.
Is hair loss from Mounjaro or Wegovy permanent?
In most cases, no. With telogen effluvium, the hair follicles stay intact and the hair grows back. If the shedding lasts longer than six months or bald patches appear, have it assessed by a doctor.
Should I stop my medication if my hair falls out?
Never stop on your own. Discuss it with your doctor, who can look at the dose, the pace of weight loss and possible deficiencies with you.
Which vitamins matter for hair loss during weight loss?
Mainly iron (ferritin), vitamin D, zinc and vitamin B12, alongside enough protein. Have your levels checked first so you can address deficiencies in a targeted way.
Sources
- Tang et al. (2026). Risk of hair loss associated with GLP-1 receptor agonists in adults with type 2 diabetes: target trial emulation. The BMJ.
- George Washington University (2026). Study links popular GLP-1 weight-loss drugs to increased risk of hair loss. On the study in JAAD International.
- Wilding et al. (2021). Once-weekly semaglutide in adults with overweight or obesity. New England Journal of Medicine, 384(11), 989–1002.
- Zhang et al. (2021). Hair loss after metabolic and bariatric surgery: a systematic review and meta-analysis. Obesity Surgery.
- Dutch Health and Youth Care Inspectorate (2026). Warnings about weight loss medicines and peptides sold online, see NL Times, 1 July 2026.
This information does not replace professional medical advice. If in doubt, always consult a doctor or specialist.
