Passionflower for Sleep Quality
Passionflower (Passiflora incarnata) has only weak, preliminary evidence for improving sleep quality: a few small, short trials hint at modest benefit, but the data are too limited and inconsistent to confirm it reliably works.
Why this grade7-layer evidence engine
The evidence is graded weak because it rests on just a handful of small, short trials with inconsistent doses and no high-quality meta-analysis. A 2011 trial of low-dose tea (n=41, 1 week) found subjectively better sleep versus placebo (PMID 21294203, p<0.01), and a 2024 extract trial (n=65, 4 weeks) reported longer sleep time and less stress (PMID 38646244) — but that study was industry-funded and rated low-quality.
Objective measures are softer than the subjective ratings. In a polysomnography trial (n=110, PMID 31714321), total sleep time rose only borderline-significantly (P=0.049), while sleep efficiency and wake-after-sleep-onset did not improve significantly. A 2020 systematic review of 9 RCTs (PMID 33352740) concluded passionflower may help with insomnia and stress, but flagged that study methods and durations varied widely (1–30 days) with no standardization.
Health authorities are cautious rather than endorsing. The US FDA lists passionflower only as a food-grade flavoring agent with no approved efficacy claim, and EFSA has authorized no health claim. Cleveland Clinic frames herbal teas as a relaxation and bedtime-routine aid rather than a proven remedy, and although the Sleep Foundation cites some evidence for passionflower tea, sleep-medicine specialists note the lack of solid efficacy and safety data. Note too that passionflower may add to the sedative effects of alcohol and sleep medications.
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 = 0.568
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 無高階證據可裁決
- tier_strict_requirement_check — | B→C 因 scope.conflation_risk=true 且 L11 獨評較低 (B7-2 tier cap)
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status