Skip to main content
Evidence-Based Supplement Research
Evidence-Based Supplement Research
Pillser
Search
Sign UpLog In

L-Carnitine and Reduced Blood Cholesterol

Research synthesisModerate evidenceMixed effect size6 studies · 4 beneficial · 2 neutral · 0 harmful

Across 6 studies, 4 reported beneficial effects of L-carnitine on blood cholesterol, with effect sizes ranging from small to large, while 2 studies found neutral effects. Statistically significant reductions were observed in 4 studies. The most-studied population is women with polycystic ovary syndrome (PCOS), with doses typically around 1-3 g/day. The median study duration was 70 days, indicating effects are typically observed after several weeks of supplementation.

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

Caveats: Available evidence is overwhelmingly positive (4 of 6 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). Two studies (a large meta-analysis in type 2 diabetes and an RCT in overweight/obese women with PCOS) found no significant effect, suggesting the benefit may not be universal and could depend on population or dose. One study used L-carnitine 3000 mg/day (large effect) while neutral studies used 1 g/day — dose may moderate the effect.

Generated Jul 15, 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
  • mg/day: 1,000 (median 1,000, IQR 1,000–1,000) — 1 study
  • mg/kg/day: 50 (median 50, IQR 50–50) — 1 study
Time to effect
Median: 10 weeks · IQR 8 weeks–11 weeks · Range 6 weeks–2.8 months — Reported in 3 of 6 studies
6 of 6 papers
Back to top