If you have started a GLP 1 medication and noticed more hair on your pillow, in the shower or on your hairbrush, you are not alone.
Hair shedding has been reported in people taking GLP-1 medicines, including semaglutide and tirzepatide. However, it is important to understand that hair shedding during GLP 1 treatment does not necessarily mean the medication is directly damaging your hair follicles or that the hair loss will be permanent.
Changes associated with weight loss – particularly significant or rapid weight loss, eating substantially less and not getting enough protein or other nutrients – may play an important role.
The good news is that there are practical steps you can take to support healthy hair while working towards your weight loss goals.
Can GLP 1 medications cause hair loss?
Hair thinning or hair loss has been reported in people taking GLP-1 medicines.
A recent 2026 study published in The BMJ provides additional evidence that this association is worth paying attention to. Researchers used electronic health record data from adults with type 2 diabetes and compared people starting GLP-1 receptor agonists with people starting other diabetes medicines. They found an increased risk of alopecia, particularly non-scarring alopecia, among GLP-1 receptor agonist users. However, the absolute risk was low, and the study was observational, so it cannot prove that GLP-1 medicines directly cause hair loss.
It is also important to note that the study involved adults with type 2 diabetes. Its findings therefore cannot automatically be assumed to apply in exactly the same way to everyone taking a GLP-1 medicine for weight management.
Read the 2026 study in The BMJ
There are several possible explanations for why hair shedding may occur during GLP 1 treatment.
One possibility is telogen effluvium, a temporary form of excessive hair shedding that can occur after a significant physical stress on the body. Rapid or substantial weight loss is a recognised trigger. The American Academy of Dermatology (AAD) also notes that people taking GLP-1 medicines may experience thinning hair and that sudden weight loss and eating less may contribute.
For example, if your appetite decreases significantly after starting a GLP-1, you may unintentionally eat much less protein, calories or other nutrients than your body needs.
So, rather than thinking:
“GLP 1 medication is making my hair fall out.”
A more accurate way to think about it is:
“Hair shedding can occur during GLP-1 treatment, and rapid weight loss, reduced food intake and nutritional factors may contribute.”
Why can hair shedding happen during weight loss?
Your hair follicles are constantly moving through different stages of growth and rest. When your body experiences a significant stressor, more hairs can prematurely enter the resting phase.
This is known as telogen effluvium.
Several factors during weight loss may potentially contribute:
1. Significant or rapid weight loss
Losing a substantial amount of weight can be a physical stressor for the body.
The AAD lists significant weight loss among common triggers of excessive hair shedding. Hair shedding may not happen immediately – it can become noticeable several weeks or months after the triggering event.
2. Eating substantially less
GLP-1 medicines can reduce appetite and food intake.
While this is part of how they can support weight loss, eating much less can make it harder to obtain adequate protein, iron and other nutrients from food.
3. Not getting enough protein
Hair is primarily made of a protein called keratin.
If your overall protein intake falls significantly while you are losing weight, it may make it harder to support normal hair growth.
4. Nutritional deficiencies
Restrictive diets or prolonged inadequate food intake can increase the risk of nutritional deficiencies.
Depending on your individual circumstances, a doctor may consider whether nutrients such as iron or other factors need to be assessed.
5. An underlying type of hair loss
Not every case of hair loss during GLP-1 treatment is caused by weight loss.
For example, male pattern hair loss, also known as androgenetic alopecia, is a common genetic form of hair loss that can continue to progress independently of weight loss or GLP-1 treatment.
This distinction matters because the appropriate treatment depends on the underlying cause.
How to keep your hair healthy on GLP-1: 7 practical tips
1. Make protein a priority
One of the most important things you can do while losing weight is to make sure your diet still provides adequate protein.
Try to include a source of protein at your meals, such as:
- Fish
- Chicken
- Eggs
- Lean meat
- Greek yoghurt
- Milk
- Tofu
- Tempeh
- Soy products
- Beans and lentils
The exact amount of protein you need depends on factors such as your body size, age, activity level, overall diet and health.
If you are struggling to eat enough because your appetite is significantly reduced, speak with your doctor or a dietitian rather than simply trying to force yourself to eat large meals.
Key point: Weight loss should not mean unintentionally starving yourself of protein and essential nutrients.
2. Avoid overly restrictive dieting
GLP-1 medicines already reduce appetite for many people. Combining them with an extremely restrictive diet can make it harder to meet your nutritional needs.
You do not need to eliminate entire food groups simply because you are trying to lose weight.
Instead, focus on meals that provide a good balance of:
- Protein
- Vegetables and fruit
- Whole grains or other sources of carbohydrates
- Healthy fats
- Adequate fluids
A sustainable approach is generally more useful than trying to lose weight as quickly as possible.
3. Eat a varied, nutrient-dense diet
Hair growth requires more than protein alone.
Your overall diet should provide a range of vitamins and minerals.
Rather than immediately reaching for a “hair vitamin”, start by looking at what you are actually eating.
Useful foods to include regularly include:
- Protein: eggs, fish, chicken, lean meat, tofu and legumes
- Iron-containing foods: lean meat, seafood, beans, lentils and leafy green vegetables
- Healthy fats: nuts, seeds, avocado and oily fish
- Fruits and vegetables: aim for variety rather than relying on one particular “hair growth” food
4. Stay adequately hydrated
Dehydration is not usually the main explanation for hair loss, but maintaining adequate fluid intake is an important part of looking after yourself while taking a GLP-1 medicine.
This can be particularly relevant if you experience nausea, vomiting, diarrhoea or simply find yourself drinking less because your appetite and eating patterns have changed.
Keep fluids available throughout the day and pay attention to your body’s thirst signals.
5. Aim for sustainable weight loss
If you are losing weight rapidly, do not assume that faster is always better.
Significant weight loss can itself act as a physical stressor and may contribute to temporary hair shedding.
Your doctor can help determine whether your rate of weight loss and GLP-1 treatment plan are appropriate for you.
This is particularly important if you are:
- Losing weight very quickly
- Struggling to eat enough
- Experiencing persistent nausea or vomiting
- Feeling unusually weak or fatigued
- Experiencing significant hair shedding
Do not change your GLP-1 dose or stop prescription treatment on your own because of hair shedding.
6. Be gentle with your hair
Not all hair loss comes from inside the body.
Excessive heat, chemical treatments, tight hairstyles and rough handling can also contribute to hair breakage or damage.
While you are experiencing increased shedding, consider:
- Avoiding unnecessarily tight hairstyles
- Limiting excessive heat from hair dryers, straighteners and curling tools
- Being gentle when brushing wet hair
- Avoiding aggressive scalp scratching
- Using hair products that do not irritate your scalp
These measures will not necessarily prevent telogen effluvium, but they can help minimise additional hair damage.
7. Don’t ignore persistent or worsening hair loss
Some increased shedding during weight loss may settle as your body adjusts.
However, persistent, severe or progressive hair loss deserves proper assessment.
A doctor may look at:
- When the hair shedding started
- How quickly you have been losing weight
- Your current diet and appetite
- Your GLP-1 medication and other medicines
- Whether the hair loss is diffuse or concentrated in particular areas
- Your scalp
- Your personal and family history of hair loss
Is GLP 1 hair loss permanent?
Not necessarily.
If the shedding is related to telogen effluvium following significant weight loss or another temporary physical stressor, it can improve once the trigger settles.
The important thing to know is that telogen effluvium often has a delayed timeline.
You may notice increased shedding months after the triggering event, rather than immediately. The shedding can then gradually settle as the hair growth cycle returns to normal. The AAD notes that excessive shedding from a temporary trigger commonly improves over time, with hair tending to regain normal fullness within several months.
However, not every type of hair loss behaves this way.
For example, male pattern hair loss is a progressive condition that may continue independently of your weight loss treatment.
Should you take hair vitamins while taking a GLP-1?
Not automatically.
It can be tempting to buy a hair supplement as soon as you notice increased shedding, but supplements are not a universal solution for GLP-1-related hair loss.
If you have a genuine nutritional deficiency, correcting it may be appropriate. But taking large amounts of vitamins or minerals without knowing whether you need them is not necessarily helpful.
Your first priorities should be:
- Eating enough overall
- Getting adequate protein
- Maintaining a varied diet
- Avoiding unnecessarily restrictive eating
- Identifying and correcting any genuine nutritional deficiencies
What about biotin for GLP-1 hair loss?
Biotin is often marketed as a hair growth supplement, but taking more biotin does not automatically make hair grow faster.
Biotin deficiency can cause hair loss, but it is relatively uncommon in people who eat a varied diet.
If your hair is shedding because of rapid weight loss, inadequate calorie or protein intake, telogen effluvium or male pattern hair loss, simply taking biotin may not address the underlying problem.
When should you see a doctor about hair loss on GLP-1?
Consider speaking with a doctor if:
- Your hair shedding is persistent or getting worse
- You notice obvious thinning or bald patches
- Your scalp is itchy, painful, inflamed or scaling
- You are losing weight very rapidly
- You are struggling to eat enough
- You have symptoms that could suggest a nutritional deficiency
- You have a personal or family history of significant hair loss
- You are unsure whether the shedding is related to your GLP-1 medicine
Can you treat hair loss while continuing your GLP-1 medication?
In some cases, yes.
Experiencing hair shedding does not automatically mean that you need to stop your GLP-1 medication.
The right approach depends on why you are losing hair.
If the main issue is temporary shedding associated with significant weight loss, addressing nutrition and the underlying trigger may be sufficient while your weight management treatment continues.
Your doctor can assess the pattern of hair loss and determine whether treatment is appropriate.
Do not stop or change a prescription GLP-1 medicine without discussing it with the doctor managing your treatment.
GLP-1 hair loss: what should you do?
If you are taking semaglutide, tirzepatide or another GLP-1 medicine and notice increased hair shedding, try not to panic.
Hair shedding can occur during significant weight loss and may be temporary. The current evidence suggests that the relationship between GLP-1 medicines and hair loss is real enough to warrant attention, but it is still not clear that GLP-1 medicines directly cause hair loss in every person.
The most useful steps are to:
- Eat enough protein
- Avoid overly restrictive diets
- Maintain a varied, nutrient-dense diet
- Stay adequately hydrated
- Aim for sustainable weight loss
- Treat your hair gently
- Seek medical assessment if the shedding is persistent, severe or progressive
The key is to look at the whole picture, rather than blaming the medication alone.
References and further reading
- Tang H, Zhang B, Lu Y, et al. Risk of hair loss associated with glucagon-like peptide-1 receptor agonists in adults with type 2 diabetes: target trial emulation. BMJ. 2026;394. doi:10.1136/bmj-2026-100077. Read the full BMJ study
- American Academy of Dermatology. How can GLP-1 drugs affect my skin, hair, and nails? Read the AAD guidance
- American Academy of Dermatology. Do you have hair loss or hair shedding? Read the AAD guide to hair shedding
Disclaimer: Articles on Sire are for informational purposes only and do not constitute medical advice, diagnosis, or treatment. Always consult a licensed doctor for personalised medical advice.
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