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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 available studies, L-carnitine supplementation shows beneficial effects on reducing LDL cholesterol, with effect sizes ranging from moderate to large. Two systematic reviews/meta-analyses (one with ~2900 participants) and one RCT in women with PCOS reported statistically significant reductions in LDL-C. The only study specifying a dose used 3000 mg/day of L-carnitine for 42 days. Effects were typically observed at approximately 6 weeks, though most studies did not report duration.

  • Effective dose range: 3000 mg/day
  • Studied populations: people with PCOS, people with overweight/obesity, people 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). The only study reporting a specific dose used 3000 mg/day of L-carnitine in women with PCOS; other studies did not specify dose or form, limiting dose-response conclusions.

Generated Jun 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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