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Alopecia AreataMay 2022Summary reviewed May 2026

A Daily JAK Inhibitor Pill Regrew Hair in 39% of People With Severe Hair Loss

BRAVE-AA1 and BRAVE-AA2 tested baricitinib, a daily oral JAK inhibitor pill, in 1,200 adults with severe scalp hair loss from alopecia areata. After 36 weeks, more than a third of those on the higher dose had near-complete regrowth.

What the trial was testing

The BRAVE-AA1 enrolled 784 patients with alopecia areata. The study was sponsored by Eli Lilly and tracked outcomes across the full group of patients who matched the trial's eligibility profile.

It was mid-stage testing (phase 2/3). Trials at this stage are designed to produce evidence regulators and physicians can act on — not just observations to follow up later.

What the results showed

39% had near-complete scalp regrowth at 36 weeks vs. 6% on the comparison pill.

New England Journal of Medicine · 2022 · NCT03570749

These findings — that achieved near-complete scalp regrowth at 36 weeks on 4 mg baricitinib — were published in the New England Journal of Medicine and represent the headline result of the study.

Researchers tracked outcomes across 784 patients enrolled in the trial. The result was consistent enough across the group that the team felt confident reporting it.

What this means for patients

For patients with alopecia areata, this result changes the calculus on what to ask their care team about. Whether it changes day-to-day care depends on factors like disease subtype, prior treatments, and where the patient is in their care journey.

What you can do now

Baricitinib (Olumiant) is FDA-approved for severe alopecia areata in adults and available now. It is taken once daily as a pill. Side effects to watch for include infections, blood clots, and changes in cholesterol. Ask a dermatologist about whether you qualify and what monitoring is needed.

Eligibility for the treatments mentioned above depends on specific test results and clinical history. Bring this summary, the trial name, and your most recent labs or pathology report to your next visit.