Do GLP-1s Cause Hair Loss? What to Know and What You Can Do

If you’re on a GLP-1 medication, you may be losing weight, possibly quite a lot of it. You might also be experiencing unexpected (and definitely unwanted) hair thinning.

There’s growing evidence that these physical changes could be linked.

Temporary hair loss has been reported by people taking semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound), and other GLP-1 medications for conditions like obesity or diabetes. Experts say that hair loss on a GLP-1 drug might also signal another issue that requires attention from a healthcare professional.

“Hair loss can be the body telling you something is off,” says Anthony Rossi, MD, a dermatologist and skin cancer surgeon at Memorial Sloan Kettering Cancer Center in New York City.

A larger 2026 study compared adults with type 2 diabetes who started a GLP-1 medication — including Ozempic, Mounjaro (tirzepatide), Trulicity, and Victoza (liraglutide) — with people who started one of two other diabetes drug classes. After researchers accounted for differences between the groups, GLP-1 users were 37 percent more likely to receive a hair loss diagnosis than people taking SGLT-2 inhibitors and 68 percent more likely than those taking DPP-4 inhibitors.

While the relative risk for hair loss was high, the absolute number of medically recorded cases remained low: about seven diagnoses per 1,000 person-years (the equivalent of one person followed for one full year) among GLP-1 users, compared with roughly four to five per 1,000 in the other groups.

Rapid weight loss can act as a physical stressor, much like surgery, pregnancy, illness, or other major changes in the body, explains Dr. Vinton.

Losing weight very quickly — more than one to two pounds per week — can push hairs from a growing phase into a quiet phase. About two to three months later, those hairs begin to fall out, a process called telogen effluvium, says Vinton. That delay explains why someone may not connect the hair clump in the shower drain with weight loss that began weeks or months earlier.

Eating too little may add to the problem. When the body has limited calories and nutrients, it protects the heart, kidneys, liver, and other vital organs before putting energy toward growing hair, says Dr. Rossi. “Hair is not really essential to living, even though we like to think it is,” he adds.

Protein deficiency, low iron or zinc, thyroid problems, emotional stress, hormonal changes, and changes in how the body uses nutrients could also affect the hair-growth cycle.

Hair-loss patterns can provide important clues about whether a GLP-1 like Zepbound or Mounjaro is responsible or whether something else is happening.

Thinning hair all around the top of the head. This type of hair loss can be a symptom of telogen effluvium linked to a GLP-1. “It is highly reversible and typically resolves [gets better] within six to nine months after the underlying cause has been addressed,” says Vinton.

A widening part or a receding hairline. Also called androgenetic alopecia, this type of hair loss is more likely related to genetics than GLP-1s. For men, it looks like a receding hairline at the temples and thinning hair at the top or crown of head, and for women, it’s thinning across the entire top of head with a widening center part. Unlike GLP-1-related telogen effluvium, this type of hair loss won’t improve without treatment.

Sudden round bald patches. The issue may be alopecia areata, an autoimmune condition in which the immune system attacks hair follicles. It can appear within days or weeks and may resolve, recur, or spread unpredictably, says Vinton. This type of hair loss hasn’t been consistently associated with GLP-1 treatment, she says.

The type of hair loss a person is experiencing isn’t always clear-cut. “Some people may not actually be developing brand-new hair loss, but rather the medication may reveal or accelerate underlying pattern thinning that was already going to happen,” says Rossi.

“If you notice hair loss, don’t panic, and don’t stop taking the GLP-1 on your own without discussing it with your provider first,” says Rossi.

The goal is to identify what may be stressing your body or limiting hair growth, rather than assuming you need to abandon a medication that is otherwise helping you.

Here’s what you should do if you think a GLP-1 like Wegovy is causing hair loss.

Tell your prescriber if you’re struggling to eat. If you’re going a whole day without eating, that means your dose is too high, says Rossi. “GLP-1s weren’t intended as a way to simply stop eating; you need to eat real food because that’s where the nutrients come from,” he says.

Persistent nausea or vomiting that prevents adequate food intake should also warrant discussing a lower dose, Vinton adds.

Review how quickly you’re losing weight. Losing more than one to two pounds per week may signal the body to temporarily conserve resources, Vinton says. Hair loss accompanied by fatigue, weakness, dehydration, dry skin, or a general feeling of being unwell may suggest that weight loss or calorie restriction has become too aggressive.

Make adequate nutrition the priority. Rossi recommends sufficient calories, protein, healthy fats, and micronutrients, rather than focusing on a single food or supplement. A registered dietitian can help you meet your nutrition goals when nausea, early fullness, or reduced appetite makes it difficult to eat enough.

Protein is a particular concern because inadequate intake may also contribute to muscle loss. “For obesity specialists, hair loss raises concern about loss of lean body mass related to protein deficiency,” Vinton says.

Ask whether blood work is appropriate. If Vinton has a patient who is concerned about hair loss, she may check the person’s complete blood count, comprehensive metabolic panel, thyroid function, iron levels, vitamin D, vitamin B12, and zinc. She might also check testosterone levels, if the pattern suggests hormonally influenced hair loss.

Talk to your prescriber about supplements. Vinton sometimes recommends a daily multivitamin or biotin. But evidence that biotin reverses this type of shedding is limited, unless there is a deficiency. Supplements shouldn’t replace an evaluation for low calorie or protein intake, iron deficiency, thyroid disease, or another cause.

It’s possible that your hair loss is not a GLP-1 side effect. A dermatologist can determine whether the problem is temporary shedding due to GLP-1s or another cause.

Vinton recommends seeing a dermatologist if you’re not seeing hair regrowth within six to nine months of adjusting your medication dosage to slow weight loss and addressing any nutrient deficiencies.

Seek an evaluation sooner if you develop:

• Round or sharply defined bald patches
• Redness, scaling, pain, or inflammation on the scalp
• Smooth, shiny, or scarred-looking areas
• Rapidly worsening or especially distressing hair loss

For telogen effluvium, correcting the trigger and waiting for the hair cycle to recover may be all that is needed. If regrowth is slow or pattern hair loss is also present, drug treatments may be necessary, says Rossi.

“Minoxidil is the medication used most often,” Vinton says. Depending on the diagnosis and the person’s medical history, a dermatologist may also consider spironolactone, finasteride, or dutasteride. These treatments aren’t right for everyone and should be selected with a clinician.