Verbatim response from Perplexity
For most people, oral and topical minoxidil work about the same overall, but oral minoxidil may be slightly better for some areas like the vertex/crown, while topical minoxidil has more evidence and is FDA-approved for hair loss.[5][4]
What the best available studies show:
- In a 2024 randomized trial in men with androgenetic alopecia, 5 mg oral minoxidil did not prove superior to 5% topical minoxidil overall after 24 weeks, though oral minoxidil did better on the vertex in photographic assessment.[5]
- In another comparative study, both oral and topical minoxidil improved hair diameter, and the authors concluded that 1 mg oral minoxidil may be as effective and safe as standard topical minoxidil, with no significant difference between groups.[4]
- A systematic review/meta-analysis found no clear statistical superiority of oral over topical minoxidil overall, while noting a tradeoff: oral may have somewhat better efficacy in some settings, but more adverse effects, whereas topical tends to be better tolerated.[3]
Practical takeaway:
- Choose topical minoxidil if you want the most established, FDA-approved option with a lower systemic side-effect risk.[6]
- Consider oral minoxidil if you have poor response to topical, difficulty applying it consistently, or scalp irritation from the topical form; it is commonly used off-label.[1][6][7]
Important caveat:
- Oral minoxidil can cause more body-hair growth and other systemic side effects because it is taken by mouth, so it should be used with clinician guidance.[6][7]
If you want, I can also compare side effects, cost, and who should pick oral vs topical in a simple table.