Why is my hair falling out on a GLP-1?
The short answer: Hair shedding is caused by rapid weight loss, not the drug directly — and for almost everyone it's temporary. This is reported by some, tied to rapid weight loss.
Why it happens
Fast, significant weight loss can trigger telogen effluvium, where more hair follicles than usual enter their resting phase at once. It typically starts 2–4 months after the weight loss begins — not immediately. Low protein, iron, or zinc from eating less can make it worse.
How long it lasts
It's temporary for the vast majority. Shedding usually slows within a few months and hair looks close to normal by 6–9 months, especially if you protect your protein intake.
What helps
- Hit your protein target consistently
- Ask your doctor about checking iron, zinc, and vitamin D
- Avoid losing faster than about 1% of body weight per week if you can
- Be gentle with styling while it's shedding
When to call your doctor
- Patchy bald spots rather than diffuse thinning
- Hair loss with a rash, or other signs of illness
Track this against your dose. Logging hair loss week by week shows whether it's actually easing — and gives your prescriber real data.
Related symptoms
Educational information from Calqulate.net — not medical advice, diagnosis, or treatment. Follow your prescriber's instructions and contact a licensed clinician about your symptoms.
