Cinnamon for PCOS
Cinnamon shows a weak, preliminary signal for improving insulin resistance and menstrual regularity in PCOS, but the trials are small and low quality, no major clinic or PCOS guideline endorses it, and it is not a proven treatment.
Why this grade7-layer evidence engine
The grade is weak because the human trials in PCOS are few, small, and methodologically limited. A pilot RCT (PMID 24813595, n=45) reported more frequent menstrual cycles on 1.5 g/day cinnamon, but 28 of 45 women dropped out, undermining the result. A better-conducted RCT (PMID 29250843, n=66) found significant drops in fasting insulin and HOMA-IR. Three meta-analyses (PMIDs 32151755, 33111340, 37316893) agree cinnamon modestly lowers HOMA-IR and fasting glucose, yet each pools small heterogeneous studies and is itself rated low quality.
Crucially, every trial measures only surrogate metabolic markers. None tests the outcomes that matter most in PCOS, ovulation, pregnancy, live birth, or hormonal normalization, so a benefit on insulin numbers cannot be assumed to translate into real clinical improvement. The 2023 umbrella analysis (PMID 37316893) also blends type 2 diabetes with PCOS, so the PCOS-specific effect cannot be cleanly isolated.
Authoritative bodies do not back this use. The FDA classifies cinnamon only as a flavoring agent, and the WHO monograph endorses it solely for appetite loss and indigestion, not blood sugar or PCOS. Mayo Clinic, Cleveland Clinic, Harvard Health, and NIH ODS take no position on cinnamon for PCOS, and the international PCOS guideline omits it entirely. Cassia cinnamon also carries a coumarin-related liver-toxicity risk at supplemental doses and may interact with glucose-lowering drugs, so it should not replace standard care.
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 = 0.613
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (2 篇 > 1 negative)
- 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