乙醯左旋肉鹼 Acetyl-L-Carnitine × 男性不孕
Carnitine (L-carnitine and ALCAR) shows consistent and well-replicated improvement in surrogate sperm parameters, especially progressive motility, across multiple systematic reviews and network meta-analyses (L2: 2025 network MA ranks L-carnitine first for motility, SMD 4.
Carnitine (L-carnitine and ALCAR) shows consistent and well-replicated improvement in surrogate sperm parameters, especially progressive motility, across multiple systematic reviews and network meta-analyses (L2: 2025 network MA ranks L-carnitine first for motility, SMD 4.19), supported by Examine's B grades for Seminal Motility and Sperm Quality. However, the hard reproductive outcomes that actually matter clinically are weak and inconsistent: pregnancy-rate benefit is demonstrated mainly for L-carnitine combined with micronutrients (RR 3.60) rather than carnitine alone, live birth is essentially unaddressed in the meta-analytic literature, and Examine itself grades Sperm Count and DNA Damage as D. The joint AUA/ASRM guideline (L5e) explicitly judges fertility supplements to be of questionable clinical utility, and Mayo Clinic (L5b) is skeptical, precisely because surrogate gains have not reliably translated into births. Isolated ALCAR efficacy is uncertain because it is almost always studied in combination (Proxeed Plus / LC+LAC), and a 2024 meta-analysis found the LC+LAC combination non-significant while monotherapies were significant. Examine's grade A overweights a small pooled Fertility outcome (5 studies, 338 participants) and does not adequately discount the surrogate-to-hard-outcome gap; a B grade better reflects strong surrogate evidence paired with genuinely uncertain clinically decisive benefit.
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 = 0.633
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (4 篇 > 0 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（PTT MuscleBeach/FITNESS、Dcard、Mobile01、痞客邦）幾乎沒有把乙醯左旋肉鹼與男性不孕／精子品質連結討論。鄉民提到肉鹼類補充品的場景幾乎全是減脂/健身（且多數認為減脂效果有限，屬「減肥神話」）。在備孕養精的討論串中，主流成分是瑪卡、精胺酸、鋅、CoQ10，幾乎不見乙醯左旋肉鹼被點名。因此此 intervention×condition 配對在台灣社群屬冷門、無實質討論。
無共識（社群幾乎無針對男性不孕的乙醯左旋肉鹼使用心得；現有討論集中於減脂/健身且多認為效果有限）
- 顯微精索靜脈曲張手術
- 輔助生殖技術（IUI／IVF／ICSI）
- 生活型態與危險因子調整
查看 ClaimReview 結構化資料 (JSON-LD)
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