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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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L-Carnitine and Reduced Body Mass Index

Research synthesisModerate evidenceSmall effect5 studies · 3 beneficial · 2 neutral · 0 harmful

Across 5 studies, 3 reported small beneficial effects of L-carnitine supplementation on reducing Body Mass Index, while 2 found neutral results. The most-studied dose range is 1–4 g/day, and effects were typically observed in clinical populations such as adults with type 2 diabetes or impaired glucose tolerance, though median study duration was 8 weeks (56 days) based on limited reporting.

  • Effective dose range: 1–4 g/day
  • Studied populations: adults with type 2 diabetes, hemodialysis patients

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). Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests. Effect sizes are small and clinical significance remains unclear.

Generated May 13, 2026
Doses used in studies
  • g/day: 1–2 (median 1.5, IQR 1.25–1.75) — 2 studies
  • mg/day: 150–4,000 (median 2,075, IQR 150–4,000) — 1 study
Time to effect
Median: 8 weeks · IQR 8 weeks–8 weeks · Range 8 weeks–8 weeks — Reported in 1 of 5 studies
5 of 5 papers
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