Weight Loss Medication and Hair Loss: What You Need to Know

What are weight-loss drugs, and how many Australians are using them?

Over recent years, a few medications have gone from relatively niche treatments to some of the most talked-about drugs in Australia.

These medications belong to a class known as GLP-1 receptor agonists. Originally developed to help manage type 2 diabetes, they mimic certain hormones that are naturally released in the gut after eating. These hormones help regulate blood sugar levels and increase feelings of fullness. As a result, many people taking them lose weight over time.

These effects have led GLP-1s to become widely used specifically for weight loss and obesity treatment. This demand is significant in Australia, with more than 400,000 Australians now estimated to be paying as much as $5,000 a year for these medications, largely through private prescriptions rather than subsidised access.

In Australia, the three most prominent medications in this category are Ozempic, Wegovy and Mounjaro.

The Therapeutic Goods Administration and Pharmaceutical Benefits Scheme list these medications at different price points, but the regulatory landscape is continuing to evolve.

At the end of 2025, the Pharmaceutical Benefits Advisory Committee (PBAC) recommended Wegovy for PBS listing for certain Australians with obesity and cardiovascular disease. If finalised, it would become the first obesity-specific medication to receive a PBS subsidy in Australia.

The grey market: A warning for Australians

Before October 2024, compounded replicas of GLP-1 medications were widely available in Australia through a legal loophole. It meant they weren’t subject to the same TGA standards for safety, quality, and efficacy as approved medicines. 

Concerned about the risks, Health Minister Mark Butler instigated changes to the Therapeutic Goods Act, and from 1 October 2024, GLP-1 medications were removed from the list of substances pharmacies can compound. This is a clear indication that you should be wary of any compounded weight loss drugs you see offered in pharmacies or elsewhere.

Can weight loss medication actually cause hair loss?

This is a legitimate concern: Hair loss has been identified as an adverse reaction to taking these drugs in several recent studies. An analysis of nearly 550,000 patients found that those taking GLP-1 medications for six months or more are at an increased risk of hair loss compared to individuals not using these treatments.

Some research also suggests that women may be more likely to experience this side effect, and it may occur more often at the higher doses used for weight loss rather than the lower dose typical for diabetes management.

However, it’s a bit more complicated than simply saying that GLP-1 medications cause hair loss. Shedding isn’t listed as a common side effect in the prescribing information for Ozempic, and in clinical trials of Wegovy, hair loss was reported by only around 3% of participants compared with 1% of those taking a placebo. So, there may be some kind of link, but the medication itself may not directly damage hair follicles.

Instead, the consensus among researchers seems to be that the rapid weight loss caused by the medications is the main trigger for many physiological changes, including hair shedding.

The hidden side effect of rapid weight loss: Telogen effluvium

In its normal hair growth cycle, a follicle moves through a few stages. It looks like this:

Anagen → Catagen → Telogen → Exogen

The first stage, called the anagen phase, is when the hair grows. This phase can last up to seven years. Then the follicle moves into the catagen phase, which only lasts for a few weeks. It’s a sort of pit stop before the next phase.

The third part of the cycle is the telogen phase. During this resting period of a few months, the follicle is inactive and stops producing new hair growth. After this phase, the hair reaches the exogen phase, which is when the hair is shed. Then, all things being equal, the follicle re-enters the anagen phase, and the cycle begins again.

It sounds dramatic, but at any given time, around 10–15% of the hairs on your scalp are naturally in this resting phase. With rapid weight loss, however, the normal cycle can get disrupted. The result of this disruption is called telogen effluvium.

What happens during telogen effluvium

If your body experiences a major change, such as rapid weight loss, illness, emotional stress, surgery, or childbirth, many more hair follicles than normal may enter the telogen phase at the same time. Here’s how the cycle progresses:

1. A physical stressor occurs
2. Hair follicles prematurely enter the resting phase
3. More hairs accumulate in this phase than usual
4. Shedding occurs 2–4 months later

Hairs remain in the resting phase for several weeks before falling out, so the shedding can come as a surprise. This is one reason why many people don’t immediately connect their hair loss to their recent weight loss or to their medication, but it can be a significant source of concern and confusion.

The psychological impact nobody talks about

Taking weight loss medication can trigger a significant physical change, and that can be both positive and negative. Losing weight quickly can be very empowering, but it’s not always plain sailing. Changes in body shape and the processes that are creating those changes, which can sometimes feel a little out of your control, can affect your mental state. Add in hair loss, and the effects can be magnified.

After all, for many of us, our hair is a part of our identity and an expression of our individuality. Losing it, even if the thinning is mild, can affect our confidence and self-perception. When you’re taking steps to improve your health and appearance, developing a side effect like hair loss can be disheartening and destabilising. 

It can be a struggle to deal with when it’s happening. The good news is that, for most people,  the hair shedding is temporary and reversible, often with targeted treatments. Understanding the mechanism behind it can help reduce the stress, and you can always speak to your doctor for guidance on navigating it.

Who is most at risk of hair loss on GLP-1 medications?

It’s worth pointing out that not everyone who takes a GLP-1 drug will experience hair loss. Some will have no medication side effects, and for others, it will be more pronounced. There are some factors, however, that increase a person’s risk. They include:

• Experiencing rapid or high-magnitude weight loss
• Having low protein or nutrient intake during treatment
• Being female (which comes with a higher susceptibility to telogen effluvium)
• Having pre-existing androgenetic alopecia

Let’s take a closer look at those risk factors. 

Two of the biggest risk factors are the speed and extent of your weight loss. The more rapidly you lose weight, the more it stresses the body, and the greater the chance that telogen effluvium will occur. The same applies to losing a larger proportion of your weight in a short period of time.

Research also suggests that women may be more susceptible to this type of hair shedding than men. However, those who already have androgenetic alopecia (pattern hair loss), whether they’re male or female, may be particularly likely to notice more severe shedding. This can suddenly reveal the underlying pattern of hair loss, which previously had only been gradually receding or thinning.

Also, it’s important to keep in mind that people using unregulated or previously compounded GLP-1 products, such as those found on the grey market, may also be at an increased risk of hair loss. Inconsistent dosing and unregulated ingredients may contribute to less stable weight reduction,  which would put more stress on the body.

Nutritional deficiencies that may make hair loss worse

One of the more controllable factors that can contribute to hair loss when taking GLP-1 medications is nutrition. Given that the drugs are designed to suppress appetite, you may not get all the nutrients you need to maintain good scalp health and strong hair follicles.

Consuming fewer calories can lead to deficiencies in protein, iron, zinc, and B vitamins, all of which help promote healthy hair growth.

Protein is the building block of hair, but when you don’t consume enough, your body prioritises providing it to more essential parts of your body, such as the muscles, organs, and immune system. Iron and B vitamins, meanwhile, help your blood deliver oxygen throughout the body, and follicles need a constant supply of oxygen to sustain hair growth. A nutritional deficiency in zinc weakens cells, including those in hair follicles.

The good news is that a healthy diet, even with a reduced calorie intake, can help address any nutritional shortfalls. They can also be supported by treatments that boost the levels of nutrients your hair needs.  

Will my hair grow back?

As we’ve mentioned, for most people who experience hair loss while taking GLP-1 medications, the underlying mechanism is telogen effluvium. Happily, this process is usually temporary.

In the majority of cases, hair does regrow once the body has adjusted to the physiological stress of weight loss and the overall nutritional intake stabilises.

The timing of the shedding and recovery tends to follow a fairly predictable pattern.

Let’s recap what we’ve covered so far to help put your mind at ease and give you a plan of action. 

Mild, diffuse shedding is an anticipated side effect of taking medications like Ozempic, Wegovy, and Mounjaro. Telogen effluvium is a benign and reversible condition that causes no scarring or permanent damage to follicle health. The scalp remains fully capable of hair regrowth once the triggering factor resolves itself. 

However, if your hair loss persists, worsens, or begins to show a patterned distribution, be sure to seek medical advice to identify whether there are treatment options that could help.

What should I do if I notice hair loss while taking GLP-1 medications?

The most important thing is not to stop or change your medication without first speaking to your prescribing doctor. Randomly taking and then stopping a course of treatment that’s designed to be carefully managed and structured can make things worse.

The next step is to look at whether your body is getting the nutrition it needs for healthy hair growth during weight loss. Reviewing your diet with a qualified healthcare professional can help identify any gaps that may be contributing to shedding.

It’s also useful to observe the pattern of hair loss. Diffuse shedding across the scalp is more consistent with telogen effluvium, while patterned thinning may suggest underlying androgenetic alopecia that has been accelerated. This distinction can help identify whether the hair loss is likely to resolve on its own.

You should seek a medical evaluation if shedding is severe or persistent beyond several months, or if it is causing significant concern for you. A proactive approach is particularly important if there is a visible change in density or pattern over time. In some cases, clinically studied hair loss treatments or prescription options available through a medical professional may be appropriate, as these can be tailored to your individual situation.

How The Hairy Pill^® can help

Your weight loss plan on a GLP-1 medication will be tailored to your situation. So, when it comes to treatments that help tackle hair loss, they should be personalised as well.

That’s where The Hairy Pill^® can help.

Trusted by more than 50,000 Australians, we offer doctor-led, clinically guided support for men and women experiencing hair thinning or shedding. There’s no cookie-cutter approach with us; our medical professionals develop an individual plan based on your hair loss pattern, history, overall health, and weight loss regimen.

Our treatments are formulated to support your hair’s overall health.

And you can rest easy, knowing that you’re in good hands. The Hairy Pill^® operates within Australian TGA guidelines, meaning we provide a compliant, medically appropriate pathway for people seeking support for hair loss.

Hair loss on GLP-1 medications: What it really means

For most people, Wegovy, Mounjaro, or Ozempic hair loss isn’t a sign that the medication is damaging their hair follicles. It’s usually a temporary response to the physiological stress of rapid weight loss. 

While it can be alarming to see more hair on your comb or in the shower, the condition is typically reversible. However, if you already have male or female pattern hair loss, the stress of your weight loss can accelerate this process.

The key to understanding what’s happening to your hair while taking a GLP-1 medication is having a professional assess your situation early on. This can help determine which category you may fall into, and it will inform the best intervention, making it much more likely that the effects on your hair (and your well-being) are minimised.

Get in touch today for personalised advice on hair loss while taking GLP-1 medications.

FAQ

Does slower weight loss reduce the risk?

More gradual weight loss is generally associated with a lower risk of triggering telogen effluvium. That’s because slower weight loss places less stress on the body, which is the primary cause of hair shedding. However, weight loss on GLP-1 medications isn’t always fully controllable, so maintaining good nutrition and overall health during the treatment is a good way to manage risk.

Can you prevent hair loss while taking weight-loss medication?

There’s no guaranteed way to fully prevent hair loss while taking GLP-1 medications, particularly if your weight loss is significant or rapid. However, you can reduce the risk by providing your body with adequate nutrition, particularly ensuring that you get enough protein and key micronutrients, such as iron and zinc.

Can biotin help?

Biotin is often part of hair health treatments, as it plays a role in the production of keratin, the protein that makes up hair. If you have a deficiency, biotin supplements can be very helpful.

Can I treat hair loss while staying on my weight loss medication?

Yes, in many cases, hair loss can be managed while continuing GLP-1 medication. Treatment usually focuses on supporting hair growth by providing essential nutrients your hair needs. Keep in mind, however, that any treatment approach should be personalised and guided by a medical professional.