Rapid weight loss on a GLP-1 — semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro, Zepbound) — can trigger telogen effluvium, a temporary all-over shedding. A 2025 review of ~84,000 people found GLP-1 users were about 3.4 times more likely to report hair loss, though in trials the absolute rate was roughly 3-6%. It is the rapid weight loss and lower food intake — not direct drug toxicity — that pushes follicles into the resting phase. Shedding usually starts 2-4 months in and recovers within 6-12 months. What helps: enough protein (often under-eaten on a GLP-1), checking ferritin, B12 and zinc, and not stopping your GLP-1 without your prescriber. Minoxidil can support regrowth. Use the timeline below to see roughly where you are.

Sources: AAD — shedding ↗

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Not medical advice. General education only; it does not replace diagnosis or treatment by a licensed professional. Consult a board-certified dermatologist before starting, stopping or changing any treatment.

⚠️ When to see a doctor — don’t self-treat

Sudden patchy or circular bald spots
Redness, scaling, pus, pain or itch (possible scarring alopecia — treat urgently)
Broken hairs or rapid loss
Loss with body-wide signs (weight loss, fatigue, cycle changes, acne, extra hair)
Loss right after a new medication
Any hair loss in a child

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