Hair thinning and increased shedding are among the lesser-discussed side effects of GLP-1 therapy. While not caused directly by the medication, many people notice more hair loss after starting GLP-1 drugs — and it's important to understand why so you can address it effectively.
The hair loss most people experience is called telogen effluvium — a temporary shedding triggered by physical stress on the body. Rapid weight loss, reduced calorie intake, and nutritional deficiencies (not the medication itself) prematurely shift hair follicles from the active growth phase into the resting and shedding phase.
Telogen effluvium typically begins 2–4 months after the triggering event (significant weight loss). It usually peaks around 4–6 months and resolves on its own within 6–12 months as weight stabilizes and nutrition improves. Hair loss beyond 12 months warrants further investigation.
Discontinuing your GLP-1 drug for hair loss alone is rarely warranted. The shedding is driven by the metabolic change, not the drug itself. Stopping medication may slow your weight loss without stopping the hair loss — especially if nutritional deficiencies persist.
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