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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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L-Carnitine and Reduced Body Weight

Research synthesisModerate evidenceModerate effect4 studies · 4 beneficial · 0 neutral · 0 harmful

Across all 4 studies, L-carnitine supplementation showed beneficial effects on reduced body weight. The predominant effect size was moderate, with effect sizes ranging from small to large. Doses ranged from 150 to 4000 mg/day in the two studies that reported dose, and effects were typically observed over 6–8 weeks (median study duration 49 days across 2 studies). The evidence primarily involves clinical populations such as individuals with PCOS, overweight/obesity, or diabetes.

  • Studied populations: individuals with PCOS, overweight/obesity, or impaired glucose tolerance/diabetes

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). The evidence base is small (only 4 studies) and effect sizes varied from small to large, indicating inconsistency. Only 2 of 4 studies reported dosage and duration, limiting dose-response conclusions. Most studies did not specify the form of L-carnitine, so it is unclear if effects are form-dependent.

Generated Jun 12, 2026
Doses used in studies
  • L-Carnitine · mg/day: 3,000 (median 3,000, IQR 3,000–3,000) — 1 study
  • mg/day: 150–4,000 (median 2,075, IQR 150–4,000) — 1 study
Time to effect
Median: 7 weeks · IQR 6.5 weeks–7.5 weeks · Range 6 weeks–8 weeks — Reported in 2 of 4 studies
4 of 4 papers
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