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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 effect6 studies · 4 beneficial · 2 neutral · 0 harmful

Across 6 studies, 4 reported beneficial effects of L-carnitine supplementation on reducing Body Mass Index, with effect sizes being predominantly small. The most-studied dose range was 1-4 g/day, and effects were observed in clinical populations, particularly adults with type 2 diabetes or overweight/obesity. Effects are typically observed at 8 weeks or longer based on a median study duration of 56 days.

  • Effective dose range: 1-4 g/day
  • Studied populations: Adults with type 2 diabetes, overweight/obesity, and 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). Two of the six studies showed neutral effects, and the meta-analyses included high heterogeneity (e.g., I²=93%), indicating variability in study designs and populations. Additionally, one study noted no significant effect for acetyl-L-carnitine specifically, suggesting form may matter.

Generated Jul 12, 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 6 studies
6 of 6 papers
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