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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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L-Carnitine and Reduced Triglyceride Levels

Research synthesisModerate evidenceSmall effect5 studies · 4 beneficial · 1 neutral · 0 harmful

Across 5 studies, 4 reported beneficial effects of L-carnitine on reducing triglyceride levels, with effect sizes ranging from small to large. The predominant effect size is small in the meta-analytic evidence, though one large RCT in women with PCOS showed a large effect. Effects were typically observed over 6 weeks or longer, and most evidence at doses around 2 g/day or more.

  • Effective dose range: 2000-3000 mg/day
  • Studied populations: adults with PCOS, adults with impaired glucose tolerance or diabetes, hemodialysis patients

Caveats: Available evidence is overwhelmingly positive (4 of 5 studies beneficial, 4 significant) — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). The neutral result came from a systematic review in hemodialysis patients, suggesting the effect may not generalize to all clinical populations. Most studies were meta-analyses pooling diverse populations and doses; the largest individual RCT focused specifically on women with PCOS.

Generated May 13, 2026
Doses used in studies
  • L-Carnitine · mg/day: 3,000 (median 3,000, IQR 3,000–3,000) — 1 study
Time to effect
Median: 6 weeks · IQR 6 weeks–6 weeks · Range 6 weeks–6 weeks — Reported in 1 of 5 studies
5 of 5 papers
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