乙醯左旋肉鹼 Acetyl-L-Carnitine × 認知功能
The evidence for acetyl-L-carnitine improving cognitive function is weak and inconsistent.
The evidence for acetyl-L-carnitine improving cognitive function is weak and inconsistent. The often-cited 2003 meta-analysis (21 RCTs, 1204 participants in MCI/mild-AD) found only a small effect (ES ~0.20), and it rests on old, heterogeneous, largely manufacturer-era trials with undisclosed funding. The contemporaneous 2003 Cochrane review found benefit only on the subjective Clinical Global Impression scale, no effect on objective cognitive or functional outcomes, and explicitly advised against routine clinical use; the 2017 Cochrane review found no measurable effect in cognitively healthy adults on very-low-quality evidence. EFSA formally rejected the ALCAR cognitive-function health claim (ID 1432, no cause-and-effect relationship), and no major clinic (Mayo, Cleveland, Harvard) or neurology society (Alzheimer's Association, AAN) endorses ALCAR for cognition. A Grade C is warranted: there is a small, plausible signal confined to clinical (MCI/mild-AD) populations, but it does not survive objective endpoints, is contradicted in healthy adults, and lacks any regulatory or society endorsement.
評分透明度
所有分數由 7 層證據引擎計算，過程公開可查▸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 = 0.472
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (2 篇 > 1 negative)
- 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
台灣社群幾乎沒有乙醯左旋肉鹼專門用於「認知功能」的鄉民實測。少數 PTT 健身板(MuscleBeach)討論把它當減脂/抗疲勞補劑，對效果偏保守（『輔助效果因人而異』）；認知/補腦的社群實測多指向魚油、磷脂醯絲胺酸(PS)、銀杏與市售複方（蓉憶記、愛因思坦），ALCAR 屬冷門題目，中文內容多為保健品 SEO 與 iHerb 代購頁，非匿名辯證。
無共識（台灣 PTT/Dcard/Mobile01 幾乎無 ALCAR 用於認知功能的在地實測；少數討論集中於減脂/抗疲勞情境且評價保守，補腦實測多指向魚油/PS/銀杏與市售複方而非單方 ALCAR）
- 腸胃不適（反胃/噁心/腹瀉，多見於商品頁與衛教文，非台灣社群多人實測回饋）
依論壇被提及頻率，非銷售或品質排序。
- Nutricost ALCAR（iHerb/Amazon 代購，商品頁能見度高於社群討論）
- Now Foods / California Gold Nutrition 等 iHerb 代購品牌（市場習慣以海外代購為主，無強勢台灣本土品牌）
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