Ozempic, Mounjaro and hair loss: why it can happen and what to do

Have you started treatment with Ozempic, Mounjaro or Wegovy and noticed more hair shedding? It is understandable to feel concerned and to want to know what you can do. Our hair is part of our identity and of how we feel, so noticing changes in it can create uncertainty.

During some treatments with glucagon-like peptide-1 (GLP-1) receptor agonists, which include the brand names Ozempic, Mounjaro and Wegovy, episodes of hair loss have been observed. Weight loss and changes in diet may play a part, although they do not explain every case. That is why understanding what is happening is the first step towards choosing the right care and support.

Do Ozempic, Mounjaro or Wegovy cause hair loss?

An association between some of these treatments and hair loss has been documented, but the mechanisms involved are still being investigated. Marked weight loss is a relevant explanation, together with nutritional imbalances and other individual factors.

To guide the assessment, it helps to note when the shedding started, how your weight has changed and what has changed in your diet or health over the previous months.

Why can more hair fall out during weight loss?

1. Changes in the hair cycle: telogen effluvium

Significant weight loss, especially if it is rapid, can affect the hair cycle. It forces the body to prioritize vital functions over non-essential processes such as hair growth. This triggers a type of diffuse shedding called telogen effluvium, in which many follicles move from the growth phase to the resting phase.

This shedding may become visible 2 to 4 months after the trigger. That is why it can appear once you have been on one of these medicines for a while, even if you noticed no changes at first.

2. A diet that no longer covers your needs

Reduced appetite, nausea or difficulty tolerating food can reduce the amount and variety of what you eat. In this situation, it can be harder to cover your needs for protein, vitamins and minerals.

That said, eating less does not necessarily lead to a deficiency. What matters is adapting your diet to maintain its quality and adequacy within your weight-loss plan. Reviewing it from the start makes it possible to identify difficulties and consider support when needed.

3. Other factors that may coincide

Stress, a recent illness, thyroid disorders or certain medicines can also play a part in hair loss. In addition, effluvium can coexist with other forms of alopecia. The assessment should consider the whole picture, especially if the hair was already compromised before starting treatment.

Does lost hair grow back?

In acute telogen effluvium, the outlook is usually favourable. Once the trigger is resolved, the hair cycle tends to return to normal. If there are nutritional deficiencies, correcting them is part of that process.

The shedding phase can last 3 to 6 months, and regaining volume takes longer. These timeframes are only a guide: they depend on how each person progresses and on other factors not persisting.

In some people, shedding may become more noticeable because of pre-existing androgenetic alopecia. This may explain an incomplete recovery and calls for a specific assessment; it does not mean that all of the effluvium will turn into permanent loss.

Diagnosis is always based on the clinical history and examination of the scalp, and from there the dermatologist may add tests or blood work to investigate possible causes.

What should you do if you notice hair loss while on GLP-1 treatment?

Talk to the professional managing your treatment

If the shedding worries you, that is reason enough to ask for an assessment. Tell your doctor when it started and how your weight and eating plan have changed. Mention any medicines and/or supplements you take.

If thinning patches, persistent scalp discomfort or a progressive loss of density appear, ask to be assessed by a dermatologist or trichologist.

Adapt your diet to your appetite and your needs

If your appetite drops when you start treatment and you find it hard to eat, ask for help organizing your meals: they need to cover your needs.

I recommend covering your protein, keeping sources of healthy fats and carbohydrates, together with foods that provide fibre, vitamins and minerals. Hydration also deserves attention; drink mainly between meals. The aim is for a smaller intake to remain nutritionally efficient.

Care for your scalp and hair gently

Gentle care of the scalp and hair reduces additional damage to the fibre during this stage. We recommend using products that strengthen the hair fibre and care for the follicular environment, and avoiding harsh brushing, tight hairstyles and excessive use of hairdryers, straighteners or exposure to UV radiation. Their role is to keep the hair in the best possible condition, especially while the cause of the shedding is being addressed.

Pay attention to how you feel, too

Hair loss is not only an aesthetic problem but also an emotional one. It can cause anxiety and insecurity and affect self-esteem. So if the shedding is affecting your well-being, it is key to address it holistically, with professional support and strategies that protect both hair health and emotional well-being.

Does it make sense to take a hair food supplement if you use GLP-1?

It can be useful when it helps cover an identified nutritional need. Correcting a diagnosed deficiency and topping up an insufficient intake are different situations. Medical associations now consider assessing supplements when the diet is restrictive.

This distinction allows you to act with good judgement: if your diet has become limited, nutritional support can be considered before an established deficiency develops. The choice should specify what needs to be provided and in what amount.

Hair Boost, Modesta Cassinello's food supplement, is part of our approach to hair care from within. It combines amino acids, plant extracts, vitamins and minerals, including zinc and selenium, which contribute to the maintenance of normal hair.

To assess whether to add it during GLP-1 treatment, share its composition with the professional managing your treatment, together with the changes in your diet and any medicines or supplements you take. They can then decide whether Hair Boost fits your needs, avoid duplications and check its compatibility.

Frequently asked questions about GLP-1 and hair loss

Can hair loss be avoided completely?

It cannot be guaranteed. Looking after your diet makes it possible to detect and address an insufficient intake, but it does not ensure that telogen effluvium will not appear, as it can be caused by other triggers. Follow-up helps to recognize them and act on those that apply.

Do I need minoxidil or another hair treatment?

It depends on the diagnosis. Many acute effluvia recover without specific medication. If recovery is incomplete or there is another cause of hair loss, the dermatologist may consider options such as minoxidil or supplementation.

Should I wait before seeking advice?

No. Seek advice when it worries you or you feel it is affecting your well-being. And if you already had shedding or thinning before you started, mention it at your first appointment so that it becomes part of the follow-up.

Caring for your hair while your body changes

Finding more hair in your brush can be unsettling, especially when you are making an effort to look after your health. Having a clear explanation and knowing what steps to take helps you face that concern with more confidence.

At Modesta Cassinello, the way we support you starts with understanding what has changed: how you are eating, how the shedding is evolving and what care you need. From there, we can guide you on our cosmetic and supplement range, alongside the appropriate medical assessment.

Care starts by listening to what is happening to you and giving every recommendation a purpose.