洋蔥汁 Onion Juice (Allium cepa) × 圓禿（鬼剃頭）
結論：證據分歧
整體證據基礎僅一個 2002 年伊拉克開放標籤小型 RCT（Sharquie & Al-Obaidi, J Dermatology PMID 12196747，n=38，6 週），20 多年來無任何獨立重複驗證；兩篇後續 systematic review（2018、2021）一致將其評為 high risk of bias、單一未復現訊號，無法形成結論性療效。
C 🟠 C 薄弱證據 證據分歧 ✨ low — community discussion mostly non-commercial
整體證據基礎僅一個 2002 年伊拉克開放標籤小型 RCT（Sharquie & Al-Obaidi, J Dermatology PMID 12196747，n=38，6 週），20 多年來無任何獨立重複驗證；兩篇後續 systematic review（2018、2021）一致將其評為 high risk of bias、單一未復現訊號，無法形成結論性療效。
L4 監管（FDA GRAS 僅限食品安全、EFSA/NHS/WHO 全為 not_addressed 或僅收錄傳統口服用途）與 L5 五大來源（NIH ODS、Mayo、Cleveland、Harvard、NAAF/AAD）一致沉默或不背書，符合 L11 原則「文獻存在 ≠ 學會推薦」。
機轉合理（含硫化合物 + 接觸刺激誘發局部免疫調節，類似弱化的 DPCP/SADBE）但患斑型 AA 自發緩解率高達 50%、安慰劑反應 10-30%，足以解釋大部分（即便不是全部）的對照組差異——這是典型 C 級「機轉合理 + 少量人體研究 + 學會不背書」配置。
⚖️
評分透明度
所有分數由 7 層證據引擎計算，過程公開可查原始分數 0.57
D
C
B
A
S
← 反證據 / 無效有效 / 強證據 →
最終評級
C · 證據分歧
信心度
67%
證據方向大致一致
證據層級
E2
多篇高品質統合分析（≥2 篇一致）
▸查看完整決策路徑（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 1 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
Onion juice (Allium cepa L.), a new topical treatment for alopecia areata (Sharquie & Al-Obaidi, J Dermatol)
結論：At 6 weeks, terminal hair regrowth was observed in 17/23 (73.9%) of evaluable onion-juice patients (reported as 86.9% in the abstract using a different denominator at 4 weeks) vs 2/15 (13.3%) in the tap-water control group, a statistically significant difference (P<0.0001); response was higher in males than females; no serious adverse events but mild contact dermatitis and odor were noted
前往 PubMed
Complementary and alternative treatments for alopecia: a comprehensive review (Hosking, Juhasz, Atanaskova Mesinkovska)
結論：For onion juice in alopecia areata, the review identifies only Sharquie & Al-Obaidi 2002 as the sole RCT, characterizes the evidence as limited (single small open-label trial, no replication, short follow-up, methodological concerns including non-blinded outcome assessment and inadequate randomization description), and concludes that while onion juice may be a low-cost adjunct, it cannot yet be recommended as a stand-alone evidence-based therapy; placebo response and spontaneous remission in patchy AA are known confounders
前往 PubMed
Onion juice (Allium cepa L.), a new topical treatment for alopecia areata
結論：Authors confirm Sharquie 2002 remains the only RCT of onion juice in AA at the time of review (~20 years post-publication, no replication identified); risk-of-bias was rated high (open-label, no concealment, short duration, small sample, unclear sex distribution effect); the high reported response rate (~87%) is inconsistent with typical placebo response in AA (10-30%) and with the natural course of patchy AA (spontaneous regrowth in up to 50% within a year), but the magnitude of effect relative to tap-water control still suggests a real but uncertain biological signal; review concludes evidence is insufficient to recommend onion juice monotherapy but supports further well-designed double-blind RCTs
前往 PubMed
L4a US FDA
支持
Onion (Allium cepa L.) — spice and other natural seasoning and flavoring (21 CFR 182.10); generally recognized as safe (GRAS). 來源↗
L4b EU EFSA
未表態
— 本適應症無對應資料
L4c UK NHS
未表態
— 本適應症無對應資料
L4d TW TFDA / 衛福部
中性
食品不得為醫療效能之標示、宣傳或廣告。食品標示、宣傳或廣告，不得有不實、誇張或易生誤解之情形。違反者，處新臺幣四萬元以上四百萬元以下罰鍰；涉及醫療效能者，處新臺幣六十萬元以上五百萬元以下罰鍰。 來源↗
L4e WHO
未表態
Bulbus Allii Cepae consists of the fresh or dried bulbs of Allium cepa L. (Liliaceae)... Uses described in pharmacopoeias and in traditional systems of medicine: Treatment of appetite loss and to prevent age-dependent changes in the blood vessels (atherosclerosis). It is also used to treat bacterial infections such as dysentery... Uses described in folk medicine, not supported by experimental o… 來源↗
L5a NIH Office of Dietary Supplements
未表態
— 本適應症無對應資料
L5b Mayo Clinic
未表態
— 本適應症無對應資料
L5c Cleveland Clinic
未表態
— 本適應症無對應資料
L5d Harvard Health
未表態
— 本適應症無對應資料
L5e Specialty Society (condition-mapped)
未表態
— 本適應症無對應資料
PTT · Dcard · Mobile01 彙整自公開論壇討論，非統計抽樣，僅反映社群風向。
廣告 / 業配密度 低度
低中高
📍立場總覽
台灣社群（PTT hair_loss、Dcard 美髮/美妝、Mobile01、痞客邦）對「洋蔥汁治圓禿」幾乎沒有原生使用討論。hair_loss 板的圓禿/鬼剃頭討論幾乎一面倒走醫療路線（類固醇局部注射、DPCP 局部免疫療法、口服/外用藥），未見鄉民實測洋蔥汁外用的心得文。2025 年 11 月一則小型 RCT（38 人）經 Yahoo、中時、三立、TVBS、非凡等媒體大量轉載後才出現話題，但屬商業健康媒體（L10c 視為污染來源）而非社群原生經驗；皮膚科醫師多數質疑樣本太小、圓禿本就可能自行長回。皮膚科文章列舉的生髮偏方為生薑、米酒、鹽、大蒜，並未含洋蔥。整體屬冷門、社群討論稀薄之主題。
💬社群實感
無共識（台灣社群幾無原生實測心得；話題主要由 2025 年媒體轉載單一小型研究帶動，非鄉民經驗）
破解迷思 社群最常見的 2 個誤解
✓
事實誤把媒體報導的「6 週成功率近 9 成」當成洋蔥汁療效定論（實為 38 人小型 RCT，皮膚科醫師指出圓禿本就可能自行緩解、樣本不足以代表）
✓
事實誤以為圓禿是缺營養或頭皮問題、可靠外用偏方改善（圓禿屬自體免疫掉髮，社群與醫療共識為應就醫，非偏方範疇）
🩹 社群通報的副作用
- 頭皮過敏、接觸性皮膚炎、紅腫搔癢（媒體與醫師提示之風險，非社群實測回報）
- 強烈氣味影響生活與治療依從性（媒體與醫師提示）
- 局部 / 病灶內類固醇
- JAK inhibitors (baricitinib / ritlecitinib)
查看 ClaimReview 結構化資料 (JSON-LD)
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"claimReviewed": "洋蔥汁能改善圓禿（鬼剃頭）",
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