Why GLP-1 Users Are Losing Hair (Ozempic, Mounjaro, Wegovy, Zepbound) — and How to Stop It

Nov 4, 2025

Hair Loss on Ozempic, Mounjaro, Wegovy or Zepbound: Why It Happens and What Can Help

Noticing more hair in the shower, on your brush or around the house after starting Ozempic, Mounjaro, Wegovy or Zepbound?

Hair shedding has been reported by people using GLP‑1-based weight-loss medicines. The medication may not be damaging the hair follicle directly, but rapid weight loss, reduced food intake and the physical stress placed on the body can all disrupt the normal hair-growth cycle.

Nutrient deficiencies can contribute—but they are not the only possible explanation.

The quick answer

Hair shedding during weight loss is often consistent with telogen effluvium. This is a temporary form of hair shedding that can occur after:

Rapid or substantial weight loss
A significant calorie deficit
Low protein intake
Iron deficiency
Illness, surgery or physical stress
Starting a new medication
Major hormonal changes

The shedding often begins around three months after the trigger, so it may not appear immediately after starting treatment.

Clinical trials have also recorded hair loss more frequently in people taking Wegovy and Zepbound than in placebo groups. The prescribing information associates these reports with weight reduction, although the exact mechanism has not been fully established.

Why can hair shedding happen during GLP‑1 treatment?

1. Rapid weight loss

Hair is not essential for immediate survival. When the body experiences rapid weight loss or a prolonged energy deficit, it can redirect resources towards vital organs and move more hair follicles into their resting phase.

Several months later, those hairs begin to shed.

2. Eating less protein

GLP‑1 medicines reduce appetite, which can make it difficult to eat enough food overall. Protein intake can fall particularly quickly.

Hair shafts are made largely from keratin, a type of protein. If you consistently consume too little protein, hair may become finer, weaker or more prone to shedding.

3. Iron deficiency

Low iron stores—often measured using ferritin—are one possible contributor to diffuse hair loss.

The risk may be greater if you:

Menstruate heavily
Follow a vegetarian or vegan diet
Have reduced your intake of red meat or other iron-rich foods
Already had low iron before beginning treatment
Experience persistent gastrointestinal symptoms

A multivitamin is not a substitute for diagnosing or treating iron-deficiency anaemia. If iron deficiency is suspected, speak to your GP or prescriber about appropriate blood tests.

4. A less varied diet

Eating smaller portions is not necessarily a problem, but eating a very narrow range of foods can reduce your intake of nutrients involved in normal hair growth.

These may include:

Iron
Zinc
Vitamin B12
Folate
Vitamin D
Selenium
Essential fatty acids

This does not mean that taking more of every nutrient will improve your hair. Both deficiencies and excessive supplementation can cause problems. Too much selenium or preformed vitamin A, for example, may itself contribute to hair loss.

5. Ongoing nausea, vomiting or diarrhoea

Persistent side effects can make it difficult to eat and drink consistently. If you regularly cannot meet your nutritional needs, speak to your prescriber rather than trying to compensate with an increasingly large supplement stack.

What should you do about GLP‑1 hair loss?

Prioritise protein

Include a protein source whenever you eat. Depending on your preferences, this might include:

Eggs
Greek yoghurt or cottage cheese
Chicken, fish or lean meat
Tofu, tempeh or edamame
Lentils, beans or chickpeas
A protein shake when solid food is difficult

Around 20–30g of protein at a main meal is a useful practical target for many adults, although your individual requirements depend on your weight, age, activity level and medical history.

Avoid excessively restrictive dieting

GLP‑1 medication already reduces appetite. Combining it with a very low-calorie or highly restrictive diet may increase the nutritional and physical stress placed on the body.

If you are losing weight extremely quickly or struggling to eat enough, speak to your prescriber or a registered dietitian.

Consider whether blood tests are needed

Hair loss has many possible causes. Depending on your symptoms and medical history, a healthcare professional may consider tests such as:

Full blood count
Ferritin and iron studies
Vitamin B12 and folate
Vitamin D
Thyroid function

Correcting an identified deficiency is more useful than taking high doses of nutrients without knowing whether you need them.

Use supplements to fill gaps—not replace food

A well-formulated multivitamin may help cover common micronutrient gaps when your appetite and portion sizes have fallen.

It cannot provide the protein or energy your body needs, and it should not be presented as a treatment for hair loss or a confirmed deficiency.

Be gentle with your hair

While shedding is active:

Avoid tight hairstyles
Limit harsh bleaching and chemical treatments
Reduce excessive heat styling
Brush gently
Avoid repeatedly checking or pulling at the hair

These steps will not change the underlying hair cycle, but they can reduce unnecessary breakage.

Where TRINITY may fit

TRINITY Multi‑Nutrients was formulated by a clinical pharmacist to provide broad vitamin and mineral coverage across three daily capsules: Morning, Day and Night.

It includes nutrients such as:

Iron bisglycinate
Zinc bisglycinate
Selenium
Vitamin D3
Vitamin B12 as methylcobalamin
Folate as 5‑MTHF
Biotin
Vitamin C

Rather than placing every ingredient into one tablet, TRINITY separates its formula across the day.

It may be useful for people who are eating less and want convenient, broad micronutrient coverage. However, TRINITY does not provide protein, cannot guarantee that hair shedding will stop and is not a treatment for iron deficiency or any other diagnosed condition.

TRINITY contains iron and is not suitable for everyone. Check suitability with a pharmacist or other healthcare professional if you take medication, have an existing medical condition, are pregnant or already use other supplements.

Explore TRINITY Multi‑Nutrients

When should you speak to a healthcare professional?

Arrange an assessment if:

Hair loss is severe or continues for more than six months
You develop completely bald patches
Your scalp is painful, inflamed, itchy or scaly
Your eyebrows or eyelashes are also affected
You have significant fatigue, breathlessness or palpitations
You cannot eat adequately because of treatment side effects
You are concerned about how quickly you are losing weight

Do not stop prescribed medication without speaking to your prescriber.

Frequently asked questions

Does Ozempic cause hair loss?

Hair loss has been reported during treatment with GLP‑1-based medicines, particularly when they are used for weight reduction. Rapid weight loss, reduced food intake and physiological stress may contribute, but it is not accurate to assume that every case is caused by a nutrient deficiency.

Will my hair grow back?

Telogen effluvium usually improves once the underlying trigger has settled. The shedding phase commonly lasts between three and six months, but restoring the hair’s previous volume can take considerably longer.

Recovery is not guaranteed in every case because other forms of hair loss can occur at the same time.

What is the best supplement for GLP‑1 hair loss?

There is no single best supplement. The priority is to consume enough protein and identify any genuine deficiency.

A broad multivitamin can help cover dietary gaps, but confirmed iron, vitamin B12 or vitamin D deficiency may require specific treatment from a healthcare professional.

Should I take biotin?

Biotin deficiency is uncommon, and taking very high doses is unlikely to help unless you are genuinely deficient. High-dose biotin can also interfere with certain blood tests, including some thyroid tests, so always tell your healthcare professional what supplements you take.

Does collagen help with hair loss?

Collagen provides amino acids, but evidence that collagen supplements prevent GLP‑1-related hair shedding is limited. It will not correct low iron, thyroid disease or an inadequate overall diet.

Should I stop taking my GLP‑1 medication?

Do not stop prescribed treatment without speaking to your prescriber. They can assess the rate of weight loss, side effects, diet and other possible causes of shedding.