Peptide Science Desk

GLP-1 hair loss: how common is it, and does it grow back?

Listed on the FDA labels

Hair loss is a known side effect of Wegovy and Zepbound. It was more common in women.

By the Peptide Science Desk Editorial TeamFact-checked against FDA and official sources · Not yet reviewed by a licensed clinician. How we check facts

Short answer: Yes, GLP-1 shots can cause hair loss. In the Wegovy and Zepbound trials, about 3 to 5 in 100 people lost hair, compared with 1 in 100 on a fake shot. The labels link it to weight loss, and women got it more. Doctors often see shedding after fast weight loss. Dermatologists say this kind of shedding usually stops, and hair tends to look full again in 6 to 9 months.

GLP-1 guide: how it works, the full drugs list and side effects

A pharmacist in a white coat looks at a bottle of liquid medicine in front of shelves
A pharmacist checks a liquid medicine (1988 photo).Photo: Bill Branson, National Cancer Institute (NIH), public domain

Do GLP-1 drugs cause hair loss?

  • Yes, in some people. Hair loss is on the FDA labels for Wegovy and Zepbound.
  • The Wegovy label says hair loss was linked to weight loss. In its main weight-loss studies, 3.3% of people on Wegovy lost hair, vs 1% on placebo.
  • In the Zepbound weight-loss studies, 4% to 5% of people on Zepbound lost hair, vs 1% on placebo.
  • Very few people stopped the drug because of it. No Zepbound users in those studies stopped for hair loss.

Is GLP-1 hair loss worse for women?

  • Yes, it was more common in women in the trials.
  • Zepbound label: 7.1% of women vs 0.5% of men lost hair on the drug.
  • Wegovy label: 4% of women vs 0.9% of men.
  • A 2026 review also found that women seem to be hit more.

What does the new 2026 research say?

  • A 2026 meta-analysis pooled 9 studies with 4,114 people on GLP-1 drugs. Hair loss was about 3 times more likely than on placebo. About 3.9% of users had it.
  • A second 2026 review of 24 studies found semaglutide and tirzepatide had the highest rates. Higher weight-loss doses were linked to more hair loss than lower diabetes doses.
  • It found that shedding after fast weight loss (telogen effluvium) and pattern hair loss were the most common types.
  • The authors said bigger studies are still needed to prove cause.

Why does weight loss make hair fall out?

  • Big body changes can push many hairs into a resting stage at once. A few months later they fall out. Doctors call this telogen effluvium.
  • The American Academy of Dermatology lists losing 20 pounds or more as a common trigger.
  • It is normal to shed 50 to 100 hairs a day. Shedding is when you lose a lot more than that.

Does GLP-1 hair loss grow back?

  • Shedding usually does. The American Academy of Dermatology says shedding stops as the body adjusts, and hair tends to look full again within 6 to 9 months.
  • If the trigger keeps going, shedding can last longer.
  • Pattern hair loss (from your genes) is different. It does not stop on its own, but treatment helps many people.

Can peptides like GHK-Cu stop GLP-1 hair loss?

  • We found no study in people that shows a peptide prevents or treats GLP-1 hair loss.
  • GHK-Cu is in some hair and skin products. Copper peptide shots are not FDA approved.
  • Do not stop your GLP-1 drug on your own. Talk to your doctor or a dermatologist.

When should I see a doctor about hair loss?

  • You lose hair in patches, or your scalp is red, itchy or sore.
  • Shedding lasts more than 6 to 9 months.
  • You also feel very tired, cold or weak. Ask about thyroid and iron blood tests.
  • You are a woman with a widening part or thinning on top.

The numbers in charts

Hair loss on GLP-1 shots

% of adults with hair loss in the weight-loss trials, drug vs placebo

Most people did not lose hair. It was more common than on placebo.

Show the numbers as a table
Hair loss on GLP-1 shots: % of adults with hair loss in the weight-loss trials, drug vs placebo
TrialDrugPlacebo
Wegovy 2.4 mg (semaglutide)
FDA label, weight-loss trials		3.3%1.0%
Wegovy 7.2 mg (semaglutide)
FDA label, 7.2 mg trial		5.8%1.0%
Zepbound 5, 10 or 15 mg (tirzepatide)
FDA label · 4% to 5% across doses		4–5%1%
Numbers from section 6.1 of each FDA label. A 2026 review of 9 studies (4,114 GLP-1 users) found hair loss about 3 times more likely than on placebo, in about 3.9% of users. Different trials, different people: not a head-to-head comparison. Sources: Wegovy FDA label, sections 6.1 and 12.3 (DailyMed); Zepbound FDA label, section 6.1, Table 1 (DailyMed); Cheng et al., Diabetes Res Clin Pract 2026 (PMID 42155605).

Hair loss was more common in women

% with hair loss on the drug, women vs men (FDA labels)

Women had hair loss much more often than men on both drugs.

Show the numbers as a table
Hair loss was more common in women: % with hair loss on the drug, women vs men (FDA labels)
TrialWomenMen
Wegovy 2.4 mg
Placebo: women 2%, men 0%		4%0.9%
Wegovy 7.2 mg
Placebo: women 1.5%, men 0%		8.4%0.2%
Zepbound (all doses)
Placebo: women 1.3%, men 0%		7.1%0.5%
From section 6.1 of the Wegovy and Zepbound FDA labels. Fast weight loss itself can cause hair shedding. Sources: Wegovy FDA label, sections 6.1 and 12.3 (DailyMed); Zepbound FDA label, section 6.1, Table 1 (DailyMed).

More charts: Peptides by the numbers

Hair loss numbers from FDA labels and 2026 studies

Label numbers are from the weight-loss trials on each label.

Study typePeopleMain findingLimits
Wegovy label, pooled weight-loss trialsAdults with obesityHair loss 3.3% on Wegovy vs 1% on placebo; 4% of women vs 0.9% of menLinked to weight loss; trial setting
Zepbound label, Studies 1 and 2Adults with obesity or overweightHair loss 4% to 5% on Zepbound vs 1% on placebo; 7.1% of women vs 0.5% of menLinked to weight loss; trial setting
Meta-analysis, 2026 (9 studies)4,114 GLP-1 usersAbout 3 times the risk vs placebo; 3.9% had hair lossDifferent drugs and doses pooled
Systematic review, 2026 (24 studies)Trials, cohorts, safety databasesHighest with semaglutide and tirzepatide; women more affectedMany studies were not designed to test hair loss
Check any peptide in 1 secondFree FDA Status Checker: approved, being tested, or not proven.

FAQ

Does Ozempic cause hair loss?

Hair loss is listed on the Wegovy label, which is the same drug (semaglutide) at weight-loss doses. A 2026 review found it was more common at higher weight-loss doses than at lower diabetes doses.

Does Mounjaro cause hair loss?

Mounjaro is tirzepatide, the same drug as Zepbound. Hair loss is on the Zepbound label.

Should I stop my GLP-1 if my hair falls out?

Talk to your doctor first. In the trials, very few people stopped for hair loss.

Will biotin stop GLP-1 hair loss?

We found no good study showing that. Ask a dermatologist before adding supplements.

How soon does GLP-1 hair loss start?

Dermatologists say shedding often shows up a few months after a big trigger, like large weight loss.

Related pages

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Sources

Not medical advice. Medical disclaimer.