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

Research synthesisLow evidenceMixed effect size3 studies · 2 beneficial · 1 neutral · 0 harmful

Across 3 studies, 2 reported beneficial effects and 1 reported neutral effects on reduced blood cholesterol, with effects ranging from small to large. The predominant effect direction is beneficial, but effect sizes are mixed (small to large). The only study reporting duration observed effects at 42 days. The most-studied dose was 1-3 g/day, primarily in clinical populations (type 2 diabetes, PCOS).

  • Effective dose range: 1-3 g/day
  • Studied populations: adults with type 2 diabetes, women with polycystic ovary syndrome (PCOS)

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Effects were inconsistent: a large-scale meta-analysis in type 2 diabetes found a small neutral effect, while a smaller RCT in PCOS and an umbrella meta-analysis found significant beneficial effects. Different populations and study designs may account for this variation.

Generated May 25, 2026
Doses used in studies
  • g/day: 1–2 (median 1.5, IQR 1.25–1.75) — 2 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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