The Mounjaro label lists alopecia only under postmarketing reports (Section 6.2), unquantified and without a causal claim — the same as Ozempic. It is not in the trial adverse-reaction table. The shedding some people notice on GLP-1 medicines is usually telogen effluvium, temporary shedding that follows rapid weight loss rather than damage to hair follicles. It typically starts two to four months after the fastest weight loss, and the American Academy of Dermatology puts recovery at six to nine months once the trigger settles.
What the Mounjaro label says
The Mounjaro label lists alopecia only under postmarketing reports (Section 6.2), unquantified and without a causal claim — the same as Ozempic. It is not in the trial adverse-reaction table.
Mounjaro is a diabetes dose of tirzepatide. The same molecule studied for weight loss is Zepbound, whose label does report a hair-loss frequency (about 5%). If you are on Mounjaro for weight rather than diabetes, the Zepbound numbers are the closer guide.
Hair loss is listed as an adverse reaction, never as a boxed or Section 5 warning, for any drug in this class.
Why it happens, when it stops, why some people say it never grew back, what helps (and why biotin can interfere with lab tests), and when shedding points to something else are covered once for all GLP-1 medicines: GLP-1 hair loss and what helps with GLP-1 hair loss.
Common questions
Does Mounjaro cause hair loss?
The Mounjaro label lists alopecia only under postmarketing reports (Section 6.2), unquantified and without a causal claim — the same as Ozempic. It is not in the trial adverse-reaction table.
Does biotin help hair loss on Mounjaro?
Evidence does not support biotin unless you are genuinely deficient, which is rare. The FDA also warns that biotin interferes with lab tests, including troponin, where it can produce a falsely low result and mask a heart attack. Test before supplementing.