共軛亞麻油酸 Conjugated Linoleic Acid (CLA) × 增肌／瘦體組織增加
結論：證據分歧
獨立判讀為 C（薄弱證據）：雖然 L2 顯示 2024 年 70 RCT / n=4,159 高品質 meta-analysis 對 fat-free mass 達統計顯著（WMD +0.
C 🟠 C 薄弱證據 證據分歧 ✨ low — community discussion mostly non-commercial
獨立判讀為 C（薄弱證據）：雖然 L2 顯示 2024 年 70 RCT / n=4,159 高品質 meta-analysis 對 fat-free mass 達統計顯著（WMD +0.27 kg, P=0.003），但作者本人明確指出臨床意義不足；EFSA 2010 明確拒絕「increase in lean body mass」(IDs 498, 731) 因果關係未建立，與 Examine B 級評等形成直接矛盾。
Mayo/Cleveland/Harvard 全 not_addressed、ISSN 2017 Position Stand 完全未提 CLA、JISSN 2015 review cautious（9/16 人體 RCT 無效），權威學會層級無任何支持，整體訊號不足以維持 B。
⚖️
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 0.61
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
64%
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 = 0.607
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (1 篇 > 0 negative)
- 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 + 1 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
Effects of conjugated linoleic acid supplementation on anthropometrics and body composition indices in adults: a systematic review and dose-response meta-analysis
結論：Pooling 70 RCTs (n=4,159) CLA supplementation produced a small but statistically significant increase in fat-free mass (WMD +0.27 kg, 95% CI 0.09–0.45, P=0.003); authors explicitly note that high-quality subgroup studies failed to show body-fat-lowering and that the FFM effect is small and may not reach clinical importance.
前往 PubMed
Effects of conjugated linoleic acid and exercise on body composition and obesity: a systematic review and meta-analysis
結論：Across 20 trials of CLA + exercise vs exercise alone, body fat was reduced (SMD -0.42, 95% CI -0.70 to -0.14, P=0.003) and insulin resistance fell (SMD -0.25, 95% CI -0.44 to -0.06, P=0.01); lean body mass / muscle mass was not reported as a separately pooled primary outcome — body-weight, exercise performance and lipid profile showed no benefit.
前往 PubMed
The efficacy of long-term conjugated linoleic acid (CLA) supplementation on body composition in overweight and obese individuals: a systematic review and meta-analysis of randomized clinical trials
結論：Long-term (>=6 months) CLA produced a small significant fat-mass reduction (MD -1.33 kg, 95% CI -1.79 to -0.86) and weight loss (MD -0.70 kg, 95% CI -1.09 to -0.32); authors conclude RCT evidence does not convincingly demonstrate clinically relevant body-composition effects, which weakens the muscle-mass case by extension.
前往 PubMed
Conjugated linoleic acid supplementation for twelve weeks increases lean body mass in obese humans
結論：In 48 obese adults randomized double-blind for 12 weeks, the 6.4 g/day CLA arm gained +0.64 kg lean body mass vs placebo (P<0.05); short-term inflammatory markers rose modestly but remained within normal limits.
前往 PubMed
The effects of conjugated linoleic acid supplementation during resistance training
結論：Over 7 weeks of resistance training, CLA-supplemented subjects gained +1.4 kg lean tissue vs +0.2 kg in placebo (P<0.05); fat mass fell 0.8 kg in CLA vs +0.4 kg in placebo (P<0.05); muscle-protein-degradation marker 3-methylhistidine increased less with CLA.
前往 PubMed
L4a US FDA
支持
FDA has no questions. The notice concerns conjugated linoleic acid isomers intended for use as an ingredient in certain specified foods within the general categories of soy milk, meal replacement beverages and bars, milk products and fruit juices at levels up to 3 grams per serving. 來源↗
L4b EU EFSA
反對
The Panel considers that the information provided does not establish that a reduction in body fat mass, when accompanied by an increase in markers of lipid peroxidation and inflammation, is a beneficial physiological effect for the target population. 來源↗
L4c UK NHS
未表態
— 本適應症無對應資料
L4d TW TFDA / 衛福部
中性
已公告的健康食品規格標準（雙軌制第二軌）目前僅有「魚油」與「紅麴」兩項；其餘成分（包含共軛亞麻油酸 CLA）若欲取得「健康食品（小綠人）」標章，須循第一軌個案審查，提交安全性、功效性、安定性試驗報告，由衛生福利部審查取得「衛部健食字」許可證後方得宣稱13項法定保健功效之一。 來源↗
L4e WHO
謹慎
For the purposes of these recommendations, TFA includes all fatty acids with a double bond in the trans configuration, regardless of whether the TFA come from ruminant sources or are produced industrially. [footnote 6:] This definition includes conjugated linoleic acid. 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
L5d Harvard Health
未表態
— 本適應症無對應資料
L5e Specialty Society (condition-mapped)
謹慎
the clinical evidence appears to be insufficient and not unanimous regarding the effects on body fat reduction and major side effects have already been described 來源↗
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
PTT 健身板（MuscleBeach/FITNESS/BeautyBody）對 CLA 用於增肌減脂普遍持保留態度：多數鄉民認為效果微弱或無感，少數人短期肚子有感但兩週後即無效，且多被歸因於飲食控制與運動而非 CLA 本身。常被批為「過份神話」「心理安慰大於實質」，並抱怨 GNC 台灣定價過高。Dcard／Mobile01 幾乎無 CLA 專門討論，討論集中在健身小眾族群。
💬社群實感
多數負面（普遍認為效果微弱或無感，少數短期有感者多被歸因於飲食與運動）
破解迷思 社群最常見的 4 個誤解
✓
事實以為單吃 CLA 不運動不控制飲食就能增肌減脂
✓
事實把減脂成效誤歸功於 CLA，實則來自飲食控制與訓練
✓
事實誤信廠商宣稱「完全無副作用」
✓
事實把吃複合燃脂配方的爆汗感誤當成 CLA 的作用
🩹 社群通報的副作用
- 晚上服用導致睡不著／失眠
- 鄉民引述研究提及脂肪肝、胰島素抗性、發炎反應等疑慮
🏷️ 社群熱議品牌
依論壇被提及頻率，非銷售或品質排序。
- GNC
- MyProtein
- Bodybuilding.com（海外代購）
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查看 ClaimReview 結構化資料 (JSON-LD)
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