Effects of L-Carnitine Supplementation on Fat Metabolism, Exercise Performance, and Body Composition: A Meta-Analysis
Pooyandjoo M, et al.
Evidence is still building up
Summary
A meta-analysis (9 RCTs included) evaluating L-carnitine supplementation effects on body weight, BMI, and fat mass. Compared to placebo, significant but small reductions in body weight and BMI were observed, and these effects appear conditional on caloric restriction or exercise. The mechanism of facilitating fatty acid transport into mitochondria is well-established; the actual fat-burning benefit shows mixed evidence. L-tartrate form is considered superior in absorption.
Key findings
- 1
Significant but small reduction in body weight vs placebo
- 2
Mechanism of facilitating fatty acid transport into mitochondria is established
- 3
Exercise performance effects are weak and inconsistent
- 4
L-tartrate form shows superior absorption
- 5
Acetyl-L-carnitine (ALCAR) has been studied for cognitive and mental function
Articles featuring this study
- Research vs Bro-science
Does L-carnitine burn fat and make you lean? Lore vs research
'L-carnitine shuttles fat into your mitochondria, so taking it accelerates fat burning and slims you down.' We separate the mechanism from the real-world effect size against the research.
Hirotsugu Yoshimura
- Explainer
What is L-Carnitine? The fat transporter's real potential — and its limits
L-carnitine is an amino acid derivative that transports fatty acids into mitochondria for energy production. A meta-analysis of 9 RCTs found statistically significant but small reductions in body weight and BMI compared with placebo, with effects appearing conditional on caloric restriction or exercise. Research does not support dramatic fat loss from L-carnitine alone.
Shingo Yoshizaki
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