N-乙醯半胱胺酸 N-Acetylcysteine × 非酒精性脂肪肝 / 代謝功能障礙相關脂肪性肝病(NAFLD/MASLD)

結論:證據支持但有警示

獨立判讀為 Tier C(混合/證據不足,臨床端偏陰性、臨床前端強),不到 Tier D(仍有 Zakaria 2025 antifibrotic 訊號 + Yang 2023 強臨床前 MA + Nikbaf-Shandiz 2023 albumin/bilirubin 顯著)也明確不到 Tier B(無大型 placebo-controlled 顯著 RCT、無學會背書)。

C 🟠 C 薄弱證據 附警語發布 low — community discussion mostly non-commercial
⚠️ 標記 💊 檢驗 / 藥物交互作用

獨立判讀為 Tier C(混合/證據不足,臨床端偏陰性、臨床前端強),不到 Tier D(仍有 Zakaria 2025 antifibrotic 訊號 + Yang 2023 強臨床前 MA + Nikbaf-Shandiz 2023 albumin/bilirubin 顯著)也明確不到 Tier B(無大型 placebo-controlled 顯著 RCT、無學會背書)。

理由:(1) **最新最高品質 placebo-controlled 人類 RCT 為 null** — Sinaeinejad 2025 在 MASLD 雙盲 RCT(n=69, 1800 mg/day, 8 週)對主要肝臟終點(ALT P=0.28、AST P=0.21、hepatic steatosis grade P=0.215)全部未達顯著,僅次級代謝終點(FBG、insulin、HOMA-IR、CRP、glutathione)顯著改善;(2) **2023 人類 MA 同步 null** — Nikbaf-Shandiz 2023 整合 8 篇人類試驗,ALT/AST/ALP pooled 皆 null,僅 albumin(>800 mg/day, >12 wk subgroup)與 bilirubin 顯著,未達肝損傷主終點;(3) **Zakaria 2025 antifibrotic 訊號為唯一正向但有方法學缺陷** — 三臂主動對照(NAC vs vitamin E vs rosuvastatin)顯示 NAC 為唯一顯著抗纖維化(liver stiffness + NIT, p<0.05),但**無 placebo arm**、所有三組皆顯示 ALT/AST/steatosis 改善(無法區分 regression to mean / 自然病程 / 共同生活型態介入),causal inference 受限;(4) **臨床前 vs 臨床落差顯著** — Yang 2023 動物 MA 13 篇 SMD -2.7 至 -3.4 全部 p<0.01 是極強訊號,但作者自陳『effective dose, duration, route in humans cannot be defined from animal data alone』,且 Sinaeinejad 2025 + Nikbaf-Shandiz 2023 兩篇人類證據未複製此效應 — 經典 'translation gap';(5) **學會立場一致『未推薦』** — AASLD 2023 NAFLD/MASLD Practice Guidance 不納入 NAC(抗氧化劑章節僅具名 vitamin E)、AGA 2021 Clinical Practice Update 不納入 NAC、Mayo Clinic NAFLD 治療頁面未提及 NAC(僅 vitamin E + pioglitazone)、Cleveland Clinic no_position、Harvard Health not_addressed、NIH NCCIH 無 NAC 健康資訊頁、ODS 內部評估為 insufficient — 七大來源**無一**正面背書 NAC 於 NAFLD;(6) **dose-duration mismatch** — 早期小型陽性試驗(Khoshbaten 2010, Pamuk 2003)多為 1200-2400 mg/day × 3-12 個月,而 Sinaeinejad 2025 之 8 週可能太短不足以呈現組織學改變;換言之即使有效,最新 RCT 也未在足夠 duration 與 histology endpoint 設計下被證實。

整合:『臨床前強 + 學會 zero endorsement + 最新 placebo RCT null + 人類 MA null + 一篇 active-comparator RCT 邊際正向但無 placebo』之典型 C tier,符合 needs_more_evidence 區間。

⚖️

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 0.48
D
C
B
A
S
← 反證據 / 無效有效 / 強證據 →
最終評級
C · 附警語發布
信心度
79%
證據方向大致一致
證據層級
E6
多篇較小型隨機對照試驗

各層「支持此療效」的程度

分數越低=該層越不支持
L2 PubMed原始文獻
0.45
L3 機轉生理合理性
0.45
L1 Examine國際基準
0.50
L11 AI 複核獨立判讀
0.50
L5 臨床機構權威立場
0.55
不支持 中性 / 混合 支持
查看完整決策路徑(audit trail)
  1. compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.485
  2. tier_from_score — 依分數區間映射至 tier letter
  3. apply_hec_rules — 高品質 SR/MA 顯示 positive (1 篇 > 0 negative)
  4. tier_strict_requirement_check — Tier 條件達標,未降階
  5. detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
  6. decide_status — 依 tier + dispute 結果決定 status

Efficacy of N-Acetylcysteine on Liver Function and Metabolic Profiles in Patients with Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD): A Double-Blind, Randomized Controlled Trial.
PMID: 41431629 2025 Journal article n = 69
結論:Over 8 weeks NAC (600 mg TID) showed NO significant effect vs placebo on steatosis grade (P=0.215), AST (P=0.21) or ALT (P=0.28), with benefit only on surrogate metabolic markers (HOMA-IR and CRP both P<0.001, glutathione P=0.003).
學術資助 效應量:Steatosis P=0.215; AST P=0.21; ALT P=0.28 (all NS); HOMA-IR & CRP P<0.001 (secondary)
前往 PubMed
N-acetylcysteine improves liver function in patients with non-alcoholic Fatty liver disease.
PMID: 22308119 2010 Journal article n = 30
結論:NAC produced a significant decrease in serum ALT after 3 months versus vitamin C (active comparator) and significantly reduced spleen span, but the trial was tiny (n=30), un-blinded and reported no exact effect sizes.
🟠 品質有限 學術資助 效應量:Significant ALT reduction vs vitamin C at 3 months (no numeric effect size reported)
前往 PubMed
A Comparative Study of N-Acetyl Cysteine, Rosuvastatin, and Vitamin E in the Management of Patients with Non-Alcoholic Steatohepatitis: A Randomized Controlled Trial.
PMID: 40430469 2025 Journal article n = 135
結論:In a 3-arm trial with NO placebo (NAC 1200 mg BID vs rosuvastatin vs vitamin E), NAC was the only agent showing significant antifibrotic effect on liver stiffness and fibrosis scores (p<0.05), but all comparisons are versus active drugs rather than placebo.
🟠 品質有限 學術資助 效應量:NAC significant on LSM and fibrosis scores p<0.05 (vs active comparators, no placebo arm)
前往 PubMed
N-ACETYLCYSTEINE AND/OR URSODEOXYCHOLIC ACID ASSOCIATED WITH METFORMIN IN NON-ALCOHOLIC STEATOHEPATITIS: AN OPEN-LABEL MULTICENTER RANDOMIZED CONTROLLED TRIAL.
PMID: 31460584 2019 RCT (open-label) n = 53
結論:Across the three arms there were NO significant between-group differences in biochemistry or histology at 48 weeks; only the intragroup intention-to-treat analysis of NAC+metformin showed improved steatosis (P=0.014), ballooning (P=0.027), NAS (P=0.005) and ALT, with no change in fibrosis in any group.
學術資助 效應量:Between-group: not significant; NAC+metformin intragroup NAS P=0.005, steatosis P=0.014; fibrosis unchanged
前往 PubMed
Effect of N-acetyl cysteine in children with metabolic dysfunction-associated steatotic liver disease-A pilot study.
PMID: 38973318 2024 RCT (double-blind) n = 13
結論:In a 16-week pilot of 13 children with biopsy-confirmed MASLD, NAC (600 or 1200 mg/day) significantly improved inflammation (IL-6, hs-CRP), oxidative stress (GSH), HOMA-IR, and reduced liver enzymes, liver fat fraction and liver stiffness (baseline-adjusted between-group P<0.05 for all), though n=13 is far too small for definitive conclusions.
🟠 品質有限 學術資助 效應量:Baseline-adjusted between-group P<0.05 for all liver and metabolic outcomes (pilot, n=13)
前往 PubMed
Comprehensive transcriptomic analysis and meta-analysis identify therapeutic effects of N-acetylcysteine in nonalcoholic fatty liver disease.
PMID: 37256235 2023 Journal article
結論:This is a PRECLINICAL (animal-only) meta-analysis of 13 studies finding NAC significantly improved hepatic lipid metabolism (p<0.01), liver injury (p<0.01), steatosis (p<0.01) and glucose intolerance (p<0.05) by restoring glutathione; it explicitly concludes NAC 'should be considered for future clinical trials' and provides no human efficacy estimate.
🟠 品質有限 學術資助 效應量:Animal models: steatosis & liver injury p<0.01, glucose intolerance p<0.05 (no human data)
前往 PubMed

L4a US FDA
謹慎
NAC is excluded from the dietary supplement definition under section 201(ff)(3)(B)(ii) of the Federal Food, Drug, and Cosmetic Act 來源↗
L4b EU EFSA
反對
a cause and effect relationship has not been established 來源↗
L4c UK NHS
支持
Acetylcysteine is the antidote used to treat paracetamol overdose 來源↗
L4d TW TFDA / 衛福部
中性
— 本適應症無對應資料
L4e WHO
中性
— 本適應症無對應資料

L5a NIH Office of Dietary Supplements
謹慎
NAC has FDA approval for treating potentially hepatotoxic doses of acetaminophen. 來源↗
L5b Mayo Clinic
中性
— 本適應症無對應資料
L5c Cleveland Clinic
中性
— 本適應症無對應資料
L5d Harvard Health
中性
— 本適應症無對應資料
L5e Specialty Society (condition-mapped)
中性

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
📍立場總覽

台灣社群(PTT/Dcard/Mobile01)幾乎無「NAC 用於脂肪肝」之專門討論;脂肪肝保肝話題多集中於水飛薊、朝鮮薊與飲食運動減重,NAC 討論則偏向抗氧化/換季保養,非 NAFLD 適應症。

💬社群實感

無共識(社群對 NAC 用於脂肪肝幾無實測心得,保肝討論多指向水飛薊/朝鮮薊與減重運動)

L10a · 廠商行銷話術 行銷語言
💬 通路如何宣傳

Acetylcysteine 為祛痰劑,屬指示用藥

代表來源 ↗
L10b · TFDA 法定身份 官方認定

減少呼吸道黏膜分泌物的粘稠性

來源 ↗

  • 減重(飲食調整與運動)
  • 地中海飲食型態
  • 減少或戒除酒精
PMID 可查證引用皆附 NCBI PubMed 原始連結
🔬 6 篇 L2 文獻 經多層 sub-agent 獨立評估
🇹🇼 含台灣社群分析L10c PTT / Dcard / Mobile01
aggregated_at: 2026-06-09 claim_version: v35 engine_version: v1.0 claim_id: CLM-COND-nafld-INT-n-acetylcysteine-001
查看 ClaimReview 結構化資料 (JSON-LD)
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