二吲哚甲烷 Diindolylmethane (DIM) × 痤瘡
結論：台灣市場資訊黑箱
DIM 用於痤瘡的人體療效證據實質為零：L2 PubMed 2020-2026 找不到任何 RCT、SR 或 MA 直接評估 DIM 治療 acne，僅有 1 篇體外 C.
C 🟠 C 薄弱證據 台灣法規禁言 🚨 high — heavy affiliate marketing in TW community
DIM 用於痤瘡的人體療效證據實質為零：L2 PubMed 2020-2026 找不到任何 RCT、SR 或 MA 直接評估 DIM 治療 acne，僅有 1 篇體外 C. acnes biofilm 抑制（Kim 2022）+ 兩篇估雌激素代謝調節人體研究（其中 Newman 2024 有 Precision Analytical 業界 COI），加上一篇前列腺癌細胞 AR 拮抗的體外機轉文（Le 2003）。
坊間廣傳的『12 週 30% 發炎性病灶減少』完全無 PubMed-indexed 一手來源可追溯。
L5b/L5c/L5d/L5e 四大主流權威（Mayo、Cleveland、Harvard、AAD）對 DIM-for-acne 一致 not_addressed；尤其 AAD 2024 痤瘡指引 CAM 章節明列 zinc／tea tree／brewer's yeast／green tea／低 GI 飲食卻完全跳過 DIM，這比 zinc 的『no recommendation』還弱──連被納入文獻回顧的門檻都沒到。
據 Tier 錨點，此情境符合『U（未驗證）：無可靠人體研究』。
⚖️
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 0.44
D
C
B
A
S
← 反證據 / 無效有效 / 強證據 →
最終評級
C · 台灣法規禁言
信心度
77%
證據方向大致一致
證據層級
E7
單篇小型隨機對照試驗
▸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 = 0.44
- 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
DIM Inhibits Multispecies Biofilm Formation by Acne-Causing Bacteria and C. albicans
結論：DIM at 0.1 mM significantly inhibited planktonic growth and biofilm formation by C. acnes (P<0.05); also blocked S. aureus + C. albicans co-biofilm and downregulated biofilm-related genes (lipase, hyaluronate lyase).
前往 PubMed
Impact of DIM on urinary estrogen profile of premenopausal women
結論：DIM users showed significant differences in nearly all urinary estrogen metabolites (P<0.001) vs non-users; 2-OHE1:16-OHE1 ratio significantly increased in both whole-group and pre/post analyses, consistent with shift toward less-estrogenic metabolism. No acne or skin endpoint measured.
前往 PubMed
DIM modulates estrogen metabolism in thyroid proliferative disease patients
結論：2-OHE1:16-OHE1 ratio significantly increased (P<0.05), consistent with antiestrogenic activity. No skin/acne endpoints.
前往 PubMed
DIM is a strong androgen receptor antagonist in human prostate cancer cells
結論：DIM is a strong competitive inhibitor of DHT-AR binding; blocks AR nuclear translocation and PSA transcription; functions as bifunctional hormone disrupter.
前往 PubMed
L4a US FDA
謹慎
3,3'-DIINDOLYLMETHANE 來源↗
L4b EU EFSA
反對
Purified, synthetic 3,3'-diindolylmethane powder in supplement form is considered novel... 3,3'-diindolylmethane powder has been classified as a 'Novel Food' because it had not been consumed to a significant degree by humans in the UK or the European Union before May 15, 1997. It has not been granted authorization for sale as a food supplement. 來源↗
L4c UK NHS
未表態
— 本適應症無對應資料
L4d TW TFDA / 衛福部
未表態
— 本適應症無對應資料
L4e WHO
支持
3,3'-Diindolylmethane (DIM). CAS 1968-05-4. Source materials: Brassica oleracea var. botrytis (cauliflower), var. capitata (cabbage), var. gemmifera (Brussels sprouts), var. italica (broccoli) — whole plant. Schedule 1, Item 2 (isolate). Approved Use(s) or Purpose(s): Source of/Provides antioxidants that help fight/protect cells against/reduce the oxidative effects of (or oxidative damage cause… 來源↗
L5a NIH Office of Dietary Supplements
謹慎
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 極高
低中高
📍立場總覽
台灣 PTT/Dcard/Mobile01 幾乎無針對二吲哚甲烷（DIM）抗痘的真實鄉民討論。中文可見內容多為單一代理電商部落格（姬菈原生 Estroblock）業配、iHerb/BigGo 購物頁與中國知乎/百度科普，缺乏匿名社群實測辯證，屬冷門保健品。
💬社群實感
無共識（台灣社群幾乎無真實實測討論）
- 外用 A 酸（類視黃醇）
- 過氧化苯（BPO）
- 口服 isotretinoin（口服 A 酸）
查看 ClaimReview 結構化資料 (JSON-LD)
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