Minoxidil for Androgenetic Alopecia
Topical minoxidil genuinely works for androgenetic alopecia (male and female pattern hair loss), with consistent high-quality trial evidence and unanimous regulator and clinic backing placing it among the best-supported options. The catch is that it only maintains results while you keep using it, works best on the crown rather than the hairline, and not everyone responds.
Why this grade7-layer evidence engine
This earns the top Strong-Evidence (S) grade because the proof is unusually consistent and convergent. A meta-analysis of treatments for androgenetic alopecia (PMID 28396101) found both 5% and 2% topical minoxidil significantly outperformed placebo in men, and 2% in women, with P<0.00001 across all three comparisons. A 2026 systematic review (PMID 41695992) confirms topical minoxidil remains the only FDA-approved treatment for both sexes, and a 2025 meta-analysis (PMID 41127390) treats minoxidil monotherapy as the established active baseline that combination therapy is measured against.
Regulators and major clinics line up behind the trial data with no real dissent. The US FDA label approves it to regrow hair on the top (vertex) of the scalp; Mayo Clinic and Cleveland Clinic list it as the usual first-line option; Harvard Health states that 'only minoxidil and finasteride have been proven useful'; and the EADV specialty guideline gives it the strongest 'We recommend' rating at Level 1 evidence. This three-way agreement among trials, regulators, and clinics is what pushes it to S tier.
The grade reflects real benefit, not a cure. Regrown hair is lost within a few months of stopping, so it requires indefinite use; results are best at the crown rather than the frontal hairline; and a meaningful minority are non-responders. A separate dose-response meta-analysis of low-dose oral minoxidil (PMID 36161084) shows it also works (about +47 hairs/cm2 per mg/day) but is off-label, with cardiovascular and excess-hair side effects rising with dose.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.73
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (3 篇 > 0 negative)
- tier_strict_requirement_check — A 級條件達標
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status