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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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L-Carnitine and Reduced LDL Cholesterol

Research synthesisLow evidenceModerate effect3 studies · 3 beneficial · 0 neutral · 0 harmful

Across all 3 studies, L-carnitine supplementation consistently showed beneficial effects on reducing LDL cholesterol, with predominantly moderate to large effect sizes. The median study duration was 42 days (based on 1 study), and the most studied population included clinical groups such as women with PCOS and individuals with overweight/obesity. Evidence is limited to a small number of studies, so findings should be considered preliminary.

  • Effective dose range: 3000 mg/day
  • Studied populations: women with polycystic ovary syndrome (PCOS), children or adults with overweight/obesity, participants with impaired glucose tolerance or diabetes

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. 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 study used a dose of 3000 mg/day, but the other two did not report specific doses, limiting dose-response conclusions. The longest study duration reported was 42 days, so longer-term effects are not well characterized.

Generated Jul 12, 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 3 studies
3 of 3 papers
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