Does Ozempic or Zepbound Cause Hair Loss? What's Actually Happening

This page is educational. It doesn't diagnose hair loss or recommend treatments.

What people actually notice: shedding a few months in

The most common story goes like this: you start a GLP-1, lose weight quickly, and a few months later you see far more hair in the shower drain or on your brush. That pattern fits telogen effluvium, or excessive shedding after a stressor.

The American Academy of Dermatology (AAD) says:

• It's normal to shed 50 to 100 hairs a day.
• Excessive shedding is common after certain stressors, including losing 20 pounds or more, childbirth, high fever, surgery, or major life stress.
• Most people notice the shedding "a few months after" the stressful event.
• As the body readjusts, the shedding stops, and hair tends to regain its normal fullness within 6 to 9 months. If the stressor continues, shedding can last longer.

What the FDA labels report

Hair loss appears in the prescribing information for both weight-management brands. The labels say hair loss reactions "were associated with weight reduction."

According to the Zepbound label, no one on Zepbound stopped treatment because of hair loss in those trials. Ozempic and Mounjaro use the same active ingredients, but they're approved for type 2 diabetes, usually at different doses.

The new genetic study: what it found and what it didn't

In September 2026, researchers led by NYU Langone published a study in the Journal of Investigative Dermatology (Ramessur, Spindler, Maas, et al.). It used a method called two-sample Mendelian randomization. Instead of studying people taking the drugs, it used natural genetic variation as a stand-in:

• Gene variants linked to higher activity of the GLP-1 receptor gene (GLP1R) came from a database of 31,684 people.
• Those variants were compared against genetic data on male-pattern hair loss (androgenetic alopecia) from 205,327 men, mostly of European ancestry.
• Genetically higher GLP1R expression was associated with about a 7% higher risk of male-pattern hair loss. The link held after accounting for high blood pressure, insulin resistance, and lower testosterone.

What it doesn't show:

• It didn't measure anyone taking Ozempic, Wegovy, or Zepbound. Lifelong genetic differences aren't the same as a weekly injection.
• It studied men only, so it can't tell us about women, who report hair loss more often in trials.
• It concerns pattern hair loss, a different condition from the temporary shedding most GLP-1 users describe.

A separate July 2026 study in The BMJ used health records from adults with type 2 diabetes. People who started a GLP-1 drug had a higher rate of non-scarring hair loss than those who started SGLT-2 inhibitors (hazard ratio 1.37) or DPP-4 inhibitors (1.68). The link weakened after statistical calibration. The authors called the absolute risk "low."

So what's actually happening?

Pace, protein, and iron: what's actually known

• Nutrition gaps can cause hair loss. The AAD lists too little biotin, iron, protein, or zinc as causes of noticeable hair loss, and says hair can regrow once the body gets enough. The 2025 joint advisory on GLP-1 nutrition lists iron and zinc among nutrients of concern. It names "excessive hair loss" as a possible sign of nutrient deficiency, and says needs are hard to meet below about 1,200 kcal/day for women and 1,800 kcal/day for men.
• Protein matters. See how much protein you need on a GLP-1 for published ranges and nausea-friendly ways to reach them.
• Thyroid problems can also thin hair, according to the AAD and NIDDK. That's worth ruling out with a doctor.
• Pace. Labels link hair loss to weight reduction, and the AAD links shedding to large losses. But no trial has tested whether slowing a GLP-1 dose schedule prevents hair loss. See how fast weight typically comes off in the trials.

Be gentle with your hair while it recovers. The AAD notes that hairstyles that pull can cause hair loss of their own. Don't start high-dose supplements on a hunch. Ask your clinician whether blood tests (for example, iron or thyroid levels) make sense first.

What about nails?

In October 2026, a chart saying GLP-1 users' fingernails were "detaching" spread widely online. Its figures trace to a study presented at the European Academy of Dermatology and Venereology (EADV) Congress on October 1, 2026 (Piraccini, Taïeb, Halioua, et al.). It wasn't a drug trial, and it had no placebo group. Here's what the conference abstract reports:

• Who: 575 people using GLP-1 receptor agonists and 1,329 controls with type 2 diabetes and/or obesity who had never taken them, in France, the US, Brazil, and Mexico.
• How: a cross-sectional study based on patient-reported symptoms. The researchers say future studies will use standardized dermatology exams.
• Nail detachment: 39.3% of GLP-1 users vs 8.7% of controls (the press release rounds this to 39% vs 9%).
• At least one nail disorder: 66.3% vs 52.8%. Discoloration: 45.6% vs 17.0%.

The researchers say the study can't show the drugs caused these changes. Around half of users reported nail problems before starting treatment. Adjusting for skin conditions and nutritional deficiencies weakened some of the links. The study had institutional support from Ducray Laboratories (Pierre Fabre Group), a hair and scalp care company, and several authors work there.

Why did so many non-users report nail problems? Nail changes are common. MedlinePlus says brittle nails are often a normal result of aging.

What the labels say: the current Wegovy and Zepbound prescribing information lists hair loss but doesn't mention nail problems. Some posts tied the chart to retatrutide. This study wasn't about retatrutide, which Lilly describes as investigational. It isn't FDA-approved, and Lilly plans to apply for approval in early 2027. Lilly's summary of its TRIUMPH-1 phase 3 trial doesn't list nail problems among the side effects it reports.

What else can change nails, according to NIH and the AAD:

• Lines across the nail (Beau lines) can follow illness or not getting enough nutrition. Spoon-shaped nails are associated with iron deficiency anemia.
• Fever, injury, or major stress can slow or stop nail growth for a while.
• A nail lifting off its bed is often caused by a fungal infection, psoriasis, or injury, such as an aggressive manicure.
• Biotin deficiency can cause brittle nails, but it's very rare in the US. NIH says there's little scientific evidence that biotin supplements help healthy people's hair or nails. High-dose biotin can also throw off some lab tests, including thyroid tests, so tell your clinician about any supplements.

Food comes first. NIH lists lean meat, seafood, poultry, beans, lentils, and spinach for iron; oysters, meat, poultry, and beans for zinc; and eggs, fish, meat, seeds, and nuts for biotin. See nutrients to watch on a GLP-1 and the protein guide.

When to see a doctor

See your prescriber or a board-certified dermatologist if:

• Heavy shedding lasts longer than about 6 months, or keeps getting worse.
• You notice bald patches, a receding hairline, a widening part, or thinning on the crown. These can signal pattern or other types of hair loss.
• Your scalp is red, scaly, painful, or itchy, or you see scarring. The AAD notes that follicles destroyed by scarring alopecia can't regrow hair, so early care matters.
• You also lose eyebrow or body hair, or have fatigue, feel cold, or have other new symptoms.
• A nail is lifting or separating, or the skin around a nail is red, swollen, or painful. The AAD says a dermatologist should examine any nail that's lifting.
• You see a new or changing dark streak in a nail, or deep grooves across your nails with no clear cause.
• You're eating very little or can't keep food down.

Don't stop or change your GLP-1 dose on your own because of hair or nail changes. Talk to your prescriber first.

Where Olive fits

Olive is an AI health companion. It checks in daily and helps you keep the basics steady while weight comes off: protein, regular meals, fluids, sleep, and a record of when shedding started. That makes it easier to have a useful conversation with your clinician. Olive doesn't diagnose or treat hair or nail problems. Members who want clinical help can add the Olive Protocol, which includes a licensed-clinician consult; treatment only if the clinician decides it fits. Strength matters at this stage too, so see how to keep muscle on a GLP-1.

Who this guide is for (and who it isn't for)

Good fit:

• You're on, or considering, semaglutide or tirzepatide and worried about hair.
• You've noticed more shedding a few months into treatment and want to understand why.
• You saw the genetic-study headlines, or the viral nail chart, and want the context.

Not the right fit:

• You have patchy hair loss, scalp pain, or scarring. See a dermatologist promptly.
• You're looking for a hair-regrowth product or a guarantee. We don't make treatment promises.
• You're using GLP-1s without a prescription. The FDA warns about unapproved GLP-1 products.

FAQ

Is hair loss from Ozempic or Zepbound permanent?

Usually it isn't, when it's shedding after weight loss. The American Academy of Dermatology says excessive shedding after a stressor such as losing 20 pounds or more tends to stop, and hair regains its fullness within 6 to 9 months once the body readjusts. Pattern hair loss is different and tends to progress. If shedding lasts longer, or you see patches or a receding hairline, see a dermatologist.

Will slowing down my weight loss help with hair loss?

It might, but it hasn't been proven. FDA labels say hair loss on Wegovy and Zepbound was associated with weight reduction, and dermatologists link shedding to large losses. No trial has tested whether a slower GLP-1 dose schedule prevents hair loss. Talk to your prescriber about your pace, and focus on eating enough protein and calories. Don't change your dose yourself.

Does Zepbound cause hair loss?

Hair loss is a listed side effect. In Zepbound's weight-loss trials, 4% to 5% of people on the drug reported hair loss, compared with 1% on placebo. It was more common in women (7.1%) than men (0.5%). The label says these reactions were associated with weight reduction. No one on Zepbound in those trials stopped treatment because of hair loss.

What does the 2026 genetic study mean for me?

It suggests a possible biological link between GLP-1 receptor activity and male-pattern hair loss. Men with gene variants linked to higher receptor activity had about a 7% higher risk. But it didn't study people taking the drugs, and it included only men. It doesn't change the most common explanation for shedding on GLP-1s, which is rapid weight loss. Ask your doctor about your own risk.

Why do women report more hair loss on GLP-1s?

FDA labels show higher rates in women. On Zepbound, 7.1% of women reported hair loss versus 0.5% of men. On Wegovy 2.4 mg, it was 4% of women versus 0.9% of men. The labels don't explain why. Possible reasons include differences in how hair loss is noticed and reported, but that hasn't been established. Women with ongoing shedding should see a clinician.

Can a GLP-1 make your nails fall off?

That hasn't been shown. In a 2026 conference study, 39.3% of GLP-1 users reported nail detachment, compared with 8.7% of people not taking the drugs. But the study relied on self-reported symptoms and can't show cause, and about half of users had nail problems before starting. Wegovy and Zepbound labels don't list nail problems. If a nail lifts, hurts, or looks infected, see a dermatologist.

Should I take biotin or iron supplements for GLP-1 hair loss?

Not without checking first. The AAD says low biotin, iron, protein, or zinc can cause hair loss, and hair can regrow once you get enough. But extra supplements haven't been shown to prevent GLP-1-related shedding if your levels are normal. Ask your clinician whether blood tests make sense, and focus on eating enough protein and calories.

Keep the basics steady while you lose weight

Olive's companion checks in every day to help you keep protein, meals, fluids, and sleep on track, and keeps a record you can share with your clinician. It's free to try.

See how Olive works →

Medical disclaimer

Medical disclaimer: This page is general education, not medical advice, diagnosis, or treatment. We make no promises about hair regrowth. Semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) are prescription-only and must be prescribed and monitored by a licensed clinician. They carry side effects and warnings, including hair loss, stomach side effects, gallbladder disease, pancreatitis, and a boxed warning about thyroid C-cell tumors seen in rodents. See a clinician or dermatologist about hair loss, and never change your dose without your prescriber.