Do GLP-1s Cause Hair Loss? What the Evidence Says

Hair loss shows up in clinical trials, but in a small percentage of people.

At the highest tirzepatide dose in one trial, nearly 6% of participants reported hair loss.

Zepbound’s slightly higher rate likely reflects its larger and faster weight loss. Lower-dose versions used for diabetes, like Ozempic and Mounjaro, don’t list hair loss in their main clinical trial tables.

Hair grows in cycles. Most hair is in the growth phase (anagen), and a small amount is in the resting phase (telogen) at any given time.

Major physical stress, such as rapid weight loss or a big drop in calorie intake, can push many hairs into the resting phase at once. Those hairs then shed about 2 to 4 months later. This is telogen effluvium.

Key facts about telogen effluvium:

• It causes diffuse thinning, not bald patches.
• It does not damage hair follicles.
• It’s usually temporary, and hair typically regrows once weight stabilizes.

GLP-1 hair loss can also be influenced by:

• Low protein intake from reduced appetite
• Nutrient gaps, such as low iron or other deficiencies
• Very low calorie intake
• Existing hair thinning, such as pattern hair loss, which can become more noticeable

Retatrutide is an investigational triple agonist that has produced more weight loss in trials than semaglutide or tirzepatide. Because telogen effluvium is linked to rapid weight loss, greater weight loss could plausibly raise the risk, but detailed hair loss data for retatrutide are still limited. Retatrutide is not FDA-approved.

Shedding usually becomes noticeable 2 to 4 months after starting a GLP-1 or after a dose increase, once weight loss is well underway.

In most cases, no. Telogen effluvium is temporary. Hair usually regrows after weight stabilizes and nutrition improves. If you have an underlying condition, like genetic hair loss, that hair may not return on its own.

• Prioritize protein at every meal, even when your appetite is low.
• Eat enough overall. Avoid aggressive calorie restriction on top of your medication.
• Aim for steady weight loss rather than very fast drops.
• Ask your provider about bloodwork to check iron, thyroid, and other common causes of thinning.
• Talk to your provider before changing your dose. Don’t stop a prescribed medication on your own.
• Be cautious with supplements. No supplement is proven to prevent telogen effluvium, though correcting a real deficiency may help.

Contact a healthcare provider if you notice:

• Bald patches or patchy hair loss
• Scalp redness, pain, or scaling
• Shedding that continues longer than 6 months
• Other symptoms like fatigue, cold intolerance, or brittle nails

• Does Ozempic cause hair loss? Hair loss isn’t listed in Ozempic’s main trial data, but about 3% of people on Wegovy, a higher-dose semaglutide, reported it.
• Does Zepbound cause hair loss? About 4–5% of people on Zepbound reported hair loss in trials, compared with 1% on placebo.
• Why do GLP-1s cause hair loss? Mostly because rapid weight loss can trigger telogen effluvium, a temporary shedding condition.
• Will my hair grow back after GLP-1 hair loss? Usually, yes. Telogen effluvium is temporary, and hair typically regrows once weight stabilizes.
• How do I stop hair loss on a GLP-1? Eat enough protein and calories, aim for steady weight loss, and ask your provider to check for nutrient deficiencies.

• GLP-1 hair loss affects about 3% of Wegovy users and 4–5% of Zepbound users in trials.
• It’s mainly caused by telogen effluvium from rapid weight loss.
• Shedding usually starts 2–4 months in and is typically temporary.
• Protein, adequate calories, and steady weight loss may help reduce it.
• See a doctor for patchy loss, scalp symptoms, or shedding that lasts more than 6 months.

• NBC News – Weight Loss Drugs and Hair Loss
• Ro – Does Zepbound Cause Hair Loss?
• Ro – Tirzepatide Hair Loss
• Smile Hair Clinic – Does Ozempic, Mounjaro, or Saxenda Cause Hair Loss?
• The Rx Index – GLP-1 Hair Loss Guide