Low-Dose Oral Minoxidil May Boost Hair Growth for 6 Months

Retrospective review finds initial hair density and diameter gains with low-dose oral minoxidil, but limited long-term benefits.

Apr. 17, 2026 at 8:07am

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A translucent, ghostly X-ray image revealing the detailed internal structure of a human hair follicle, with glowing lines and shapes against a dark background, conceptually illustrating the clinical findings on the effects of low-dose oral minoxidil on hair growth.An X-ray view of the intricate internal structure of a human hair follicle, highlighting the potential mechanisms behind low-dose oral minoxidil's effects on hair growth.NYC Today

A retrospective review of 178 patients with androgenetic alopecia found that low-dose oral minoxidil (LDOM) was associated with significant increases in frontal hair density and diameter within 3-6 months of treatment, but these improvements plateaued and did not continue to increase beyond 6-12 months.

Why it matters

This study provides insights into the short-term efficacy of low-dose oral minoxidil for treating hair loss, but also highlights the need for further research to understand its long-term effects and potential limitations in addressing progressive androgenetic alopecia.

The details

The study, conducted at New York University, reviewed data from 178 patients with androgenetic alopecia who received LDOM between January 2020 and October 2025. Patients had at least one baseline and follow-up frontal hair measurement. The median starting dose was 1.25 mg/day, and 65.2% of patients underwent dose escalation during treatment. Hair density and diameter were measured at 3-6 months, 6-12 months, and 12-36 months. The results showed a significant increase in mean hair density from baseline at 3-6 months (16.1 hairs/cm²) that remained stable at 6-12 months (16.2 hairs/cm²) and 12-36 months (19.0 hairs/cm²). Mean hair diameter also improved significantly from baseline at 3-6 months (3.0 μm) and 6-12 months (2.4 μm), but not at 12-36 months, indicating a plateau in improvements.

  • The study reviewed data from January 2020 to October 2025.
  • Patients underwent follow-up visits at 3-6 months, 6-12 months, and 12-36 months.

The players

Archie Spindler

Co-lead author of the study and researcher at New York University Grossman School of Medicine.

Derek Maas, BS MBA

Co-lead author of the study and researcher at New York University Grossman School of Medicine.

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What they’re saying

“LDOM is associated with initial hair density increases as early as 3-6 months, followed by stabilization.”

— Archie Spindler and Derek Maas, Researchers

“Hair diameter similarly demonstrated early gains within 3-6 months, with stabilization beginning around 6 months. A drop in hair diameter was observed during the 12-36 months, potentially reflecting AGA progression.”

— Archie Spindler and Derek Maas, Researchers

What’s next

Prospective studies with long follow-up are needed to better characterize the long-term trajectory of LDOM responses and determine whether dose escalation or additional therapies may be necessary to counteract disease progression.

The takeaway

While low-dose oral minoxidil can provide initial improvements in hair density and diameter for patients with androgenetic alopecia, the benefits appear to plateau after 6 months, highlighting the need for further research to understand its long-term efficacy and potential limitations in addressing this progressive condition.