Does GLP-1 medication cause hair loss?

The pattern alarms people because of its delay — hair seems fine for two months, then comes out in the brush by the handful. That delay is the fingerprint of telogen effluvium: a stressor (here, rapid weight loss and reduced intake) pushes an abnormally large share of follicles into their resting phase simultaneously, and resting hairs shed ≈2–3 months later on schedule. Reassurance first, then tactics: Why it’s almost certainly temporary: telogen effluvium doesn’t kill follicles — it synchronizes them. Once the stressor stabilizes (weight plateau, adequate nutrition), follicles re-enter growth and density recovers over 6–12 months. Trials report hair loss in roughly 3% (semaglutide) to 5% (tirzepatide) of participants — and more loss among bigger losers, supporting the weight-loss-itself mechanism. The levers that matter: 1. Protein. Hair is keratin; the body triages protein away from hair when intake is short. The protein floor protects hair and muscle with one habit. 2. Pace. Sustained loss much faster than ≈1%/week raises the shedding odds — another argument against racing the titration. 3. Micronutrients: iron (ferritin), zinc, vitamin D, and B12 deficiencies amplify shedding — worth a lab panel if shedding is heavy, especially for menstruating women. 4. Skip the panic-buys: minoxidil is reasonable if a dermatologist agrees, but most cases need only time; “hair gummies” mostly sell biotin to people who aren’t biotin-deficient. When to look deeper: patchy (not diffuse) loss, scalp irritation, shedding starting before any real weight loss, or no regrowth 6+ months after weight stabilizes — those patterns suggest something other than telogen effluvium and deserve a dermatology visit.