Yes, GLP-1 Hair Loss Is Real. But It Doesn’t Last Long—and You Can Minimize the Damage.

LOSING WEIGHT ON a GLP-1 can seem exciting at first. You’re shedding those hard-to-lose pounds and suddenly feeling more confident in that once-too-tight T-shirt — until you realize you’re shedding hair alongside the weight.

New research in the BMJ suggests that people with type 2 diabetes taking glucagon-like peptide-1 receptor agonists (GLP-1s) like semaglutide and tirzepatide are at greater risk of hair loss. Forums like Reddit and Quora are also blowing up with questions regarding possible GLP-1-induced weight loss, and users are suggesting several (many unproven) ways to stop it.

“GLP-1s don't [directly] cause hair loss; rapid weight loss does,” says Gillian Goddard, MD, board-certified endocrinologist and author of The Hormone Loop. “Humans evolved to recognize weight loss as bad, so our bodies assume that there is famine and that energy must be conserved.”

Further research from NYU Langone Health in the Journal of Investigative Dermatology also suggests that men on GLP-1s with a genetic predisposition for hair loss are about 7 percent more likely to lose more hair on the drugs. The good news? This type of GLP-1-associated hair loss is only the temporary kind, known as telogen effluvium.

“Rapid weight loss that can occur because of being treated with a GLP-1 medication can cause telogen effluvium, or shedding of the hair in the resting phase of the hair cycle,” says Corey Hartman, MD, a board-certified dermatologist and Men’s Health advisor.

So is the GLP-1 to blame? Not quite. Per Casandra Way, FNP-BC, a board-certified nurse practitioner and weight loss specialist, GLP-1-associated hair loss tends to be a result of limited calorie intake, low iron/ferritin, vitamin D, B12, zinc, or other nutrients, thyroid or hormone changes, or physical stress on the body. “People may be more likely to experience hair shedding if they lose weight quickly, eat a very restrictive diet, already have low vitamin or iron levels, have thyroid problems, or have a history of thinning hair,” says Way.

Dr. Hartman says that the quicker you lose weight, the more likely you are to experience hair loss, and that’s beyond just taking GLP-1s. “The likely reason is that these are the two most effective drugs for weight loss, and the more weight someone loses, and the faster, the more likely shedding becomes. A caveat is that semaglutide and tirzepatide are also simply the most widely studied, which can inflate their apparent signal. One cohort study also found that follow-up BMI was lower in GLP-1 users with hair loss than in those without it.”

If you happen to be part of the unlucky crew who are losing hair on a GLP-1, experts say don’t worry. “When weight stabilizes, hair loss typically stops, and people will see regrowth,” says Dr. Goddard.

Aside from attempting to lose weight a little more slowly, Dr. Hartman recommends checking your diet for any nutrient deficiencies that can lead to hair loss. “I also recommend that they start a hair loss supplement like Nutrafol or Xtresse when they start the GLP-1 to prevent as much hair loss as possible but also to encourage hair growth simultaneously.”

For results you can feel, Dr. Hartman also recommends microneedling to aid in reducing hair fall. A 2019 study in the Indian Journal of Trichology found that microneedling with or without topical minoxidil improved hair growth in patients with alopecia areata-related hair loss due to alopecia areata, but it has yet to be proven to work on telogen effluvium.

And before you reach for the Reddit-favorite GHK-Cu peptide injections, the data is spotty. “I do not recommend GHK-Cu injections because [there is] no good evidence that it helps, and no studies that assess it for GLP-1-related hair loss specifically,” adds Dr. Hartman.

When should you actually worry about this kind of hair loss? “If hair loss is severe, patchy, or continues for several months, further evaluation and lab testing may be needed,” adds Way.

All that to say, losing your hair while on a GLP-1 should only be a temporary side effect, associated with a lack of nutrition more than anything else. Experts suggest you check in with your labs or your diet to rule out any issues that could make the hair fall worse.