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吡咯喹啉醌 (PQQ) Pyrroloquinoline Quinone (PQQ) × 認知功能

結論：證據分歧

PQQ × 認知功能僅有 4 篇方向一致的 RCT（Itoh 2016 n=41、Shiojima 2022 n=64、Food & Function 2023 n=62、Đuríc 2024 MCI n=34）在 20-21.

C 🟠 C 薄弱證據 證據分歧 🚨 high — heavy affiliate marketing in TW community
⚠️ 標記 ⚠️ COI（產業聯盟資助） 💊 檢驗 / 藥物交互作用

PQQ × 認知功能僅有 4 篇方向一致的 RCT（Itoh 2016 n=41、Shiojima 2022 n=64、Food & Function 2023 n=62、Đuríc 2024 MCI n=34）在 20-21.5 mg/day × 6-12 週改善 Stroop／記憶／注意力，但全部為廠商（Mitsubishi BioPQQ / mnemoPQQ / Alpha Hope）贊助、樣本小、無獨立大型 MA／Cochrane。

L1 Examine 對認知條目 NOT FOUND，疲勞主要終點為 D 級無效；L5a NIH ODS／L5b Mayo／L5c Cleveland／L5d Harvard 全靜默，L5e Alzheimer's Association 概括性聲明「沒有任何補充品被證實對認知有益」，AAN 2018 MCI guideline 已於 2024-02 退役且未具名 PQQ。

L4 端 EFSA 2018/1122 與 UK FSA NOVEL-119 僅授權「安全」非「有效」，明確排除孕婦／哺乳婦／<15 歲，每日上限 20 mg，無核可健康宣稱。

整體屬「初步訊號一致但證據基礎薄弱、無獨立驗證、學會主流懷疑」的 C 級（薄弱證據／機轉與小型廠商試驗一致，但學會層級 insufficient evidence）。

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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 0.50
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
39%
證據方向分歧
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
L1 Examine國際基準
0.50
L3 機轉生理合理性
0.50
L5 臨床機構權威立場
0.50
L11 AI 複核獨立判讀
0.50
L2 PubMed原始文獻
0.60
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 = 0.503
  2. tier_from_score — 依分數區間映射至 tier letter
  3. apply_hec_rules — 無高階證據可裁決
  4. tier_strict_requirement_check — Tier 條件達標，未降階
  5. detect_disputes — 偵測到 1 個 hard + 1 個 soft dispute
  6. decide_status — 依 tier + dispute 結果決定 status

Effect of the Antioxidant Supplement Pyrroloquinoline Quinone Disodium Salt (BioPQQ) on Cognitive Functions
PMID: 26782228 2016 RCT (double-blind) n = 41
結論：Stroop interference ratio change significantly smaller in PQQ vs placebo; Touch M improved in lower-performing PQQ subjects (baseline <70); NIRS suggested increased prefrontal blood flow; no adverse events
⚠️ 廠商資助
前往 PubMed
Effect of Dietary Pyrroloquinoline Quinone Disodium Salt on Cognitive Function in Healthy Volunteers: A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study
PMID: 34415830 2022 RCT (double-blind) n = 64
結論：Significant improvements in composite memory, verbal memory, reaction time, complex attention, cognitive flexibility, executive function, and motor speed vs placebo in Japanese adults aged 40-<80; no adverse events
⚠️ 廠商資助
前往 PubMed
Pyrroloquinoline quinone disodium salt improves brain function in both younger and older adults (Food & Function)
PMID: 2023 RCT (double-blind) n = 62
— 詳細結論請見 PubMed 原文
前往 PubMed
The impact of six-week dihydrogen-pyrroloquinoline quinone supplementation on mitochondrial biomarkers, brain metabolism, and cognition in elderly individuals with mild cognitive impairment: a rand…
PMID: 38908296 2024 RCT (double-blind) n = 34
結論：BDNF significantly elevated in PQQ arm at 6 wk (p=0.01) vs placebo (p=0.27); cognitive orientation interaction effect p=0.03 favoring supplement; cerebral oxygenation rose 48.4% to 52.8% (p=0.005); NAA increased at 7/13 brain locations (p<=0.05) in MCI elderly
⚠️ 廠商資助
前往 PubMed

L4a US FDA
支持
FDA has no questions at this time regarding [the notifier's] conclusion that pyrroloquinoline quinone (PQQ) disodium salt is GRAS under the intended conditions of use. 來源↗
L4b EU EFSA
中性
The Panel concludes that the NF, pyrroloquinoline quinone disodium salt (BioPQQ™), is safe under the intended conditions of use as specified by the applicant. 來源↗
L4c UK NHS
未表態
Food Supplements as defined in Directive 2002/46/EC intended for the adult population, excluding pregnant and lactating women. ... This food supplement should be consumed by adults only excluding pregnant and lactating women. 來源↗
L4d TW TFDA / 衛福部
謹慎
— 本適應症無對應資料
L4e WHO
支持
Pyrroloquinoline quinone disodium salt produced by fermentation using Hyphomicrobium denitrificans CK-275 is safe under the intended conditions of use. The applicant intends to market PQQ for use in food supplements for healthy adults, except pregnant and lactating women, at a maximum proposed level of consumption of 20 mg/day (corresponding to 0.29 mg/kg bw per day for a 70-kg person). 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 極高
低中高
📍立場總覽

PTT（regimen/MuscleBeach）、Dcard、Mobile01 上幾乎無針對 PQQ 用於認知功能的真實鄉民實測討論；少數提及多為抗老/美肌脈絡。搜尋結果絕大多數為保健品廠商部落格、iHerb 行銷文與 SEO 推薦清單（業配/affiliate），缺乏匿名社群辯證內容。屬冷門題材，無在地社群共識。

💬社群實感

無共識（社群討論稀少，缺乏針對認知功能的真實實測心得）

L10a · 廠商行銷話術 行銷語言
💬 通路如何宣傳

California Gold PQQ 20mg 60粒 $473

代表來源 ↗
L10b · TFDA 法定身份 官方認定
🍽️一般食品

食品不得宣稱醫療效能

來源 ↗

  • 規律身體活動
  • 高血壓的妥善控制
  • 戒菸
✓ PMID 100% 反查全部經 NCBI Entrez 驗證
🔬 4 篇 L2 文獻 經多層 sub-agent 獨立評估
🇹🇼 含台灣社群分析L10c PTT / Dcard / Mobile01
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查看 ClaimReview 結構化資料 (JSON-LD) 
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