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

Research synthesisHigh evidenceSmall effect6 studies · 5 beneficial · 1 neutral · 0 harmful

Across 6 studies, 5 reported beneficial effects of L-carnitine on reducing triglyceride levels, with one neutral finding and no harmful results. Effect sizes were predominantly small, although one high-quality RCT showed a large effect. The evidence is drawn mainly from meta-analyses and a recent RCT, with a median study duration of 42 days (where reported), suggesting effects can appear within 6 weeks. The most common dose range was around 2–3 g/day, studied primarily in clinical populations such as women with PCOS and adults with metabolic or kidney conditions.

  • Effective dose range: 2–3 g/day
  • Studied populations: women with polycystic ovary syndrome (PCOS), adults with impaired glucose tolerance or diabetes, hemodialysis patients

Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). One systematic review in hemodialysis patients found no significant effect, suggesting the benefit may be less consistent in that specific population. Most studies did not specify the form of L-carnitine, limiting conclusions about form-specific effects.

Generated Jun 12, 2026
Doses used in studies
  • L-Carnitine · mg/day: 3,000 (median 3,000, IQR 3,000–3,000) — 1 study
  • g/day: 2 (median 2, IQR 2–2) — 1 study
Time to effect
Median: 6 weeks · IQR 6 weeks–6 weeks · Range 6 weeks–6 weeks — Reported in 1 of 6 studies
6 of 6 papers
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