Bee Propolis for Common Cold
The evidence that bee propolis treats or prevents the common cold is weak and far from conclusive. A single small oral-spray trial hints it may shorten symptoms by a couple of days, but the overall data are too thin and confounded to recommend it.
Why this grade7-layer evidence engine
This claim lands at a weak (Tier C) grade because the human evidence is sparse and shaky. Only one reasonably designed single-ingredient trial exists: a double-blind RCT of a poplar-type propolis oral spray (PMID 33091857, n=122) in which 83% of users had symptom remission by day 3 versus 28% on placebo, with recovery about two days earlier. But it was industry-affiliated, short (5 days), and used a topical throat spray, so any benefit may be local soothing rather than a true antiviral effect.
The rest of the literature does not close the gap. The largest trial (PMID 14993078, n=430) reported 55% fewer infections in children, but it combined propolis with echinacea and vitamin C, so propolis alone cannot be credited. Two reviews (PMID 34725836; PMID 34979259) note possible antiviral activity yet explicitly state that rigorous randomized trials are lacking, and an earlier review (PMID 27366357) rated the underlying studies as low quality. There is no Cochrane review or pooled meta-analysis.
Regulators and clinics reinforce caution. The US FDA has issued warning letters treating propolis throat-spray cold and antiviral claims as unapproved drug claims, and the EU's EFSA rejected all propolis-related health claims. Cleveland Clinic is skeptical, while the NHS, WHO, Mayo Clinic, and NIH offer no endorsement. Propolis is also a documented allergen for people sensitive to bee products, so it is published only with a warning rather than as an effective remedy.
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 = 0.46
- 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 — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status