Carnitine in Human Muscle Bioenergetics: Can Carnitine Supplementation Improve Physical Exercise?
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic search or meta-analysis
PubMed 31906370 · doi:10.3390/molecules25010182
What was done
This narrative review summarizes the biological role of L-carnitine in skeletal muscle bioenergetics and evaluates the conflicting literature regarding L-carnitine supplementation as an ergogenic aid for physical exercise.
What was found
The abstract reports no numerical findings or effect sizes. It notes that although free L-carnitine availability appears to limit mitochondrial fatty acid oxidation during high-intensity exercise, trials of L-carnitine supplementation show conflicting results driven by differences in exercise protocols, participant training status, dosing, administration route, and timing.
Why it matters
It outlines the metabolic rationale for L-carnitine supplementation while highlighting the lack of consensus on its practical efficacy for athletic performance.
Limits
As a narrative review, it introduces no primary data or systematic meta-analysis. Specific inclusion criteria, study quality assessments, and quantitative effect estimates across cited human trials are not provided in the abstract.
Cited by
- supports The scientific evidence supporting carnitine supplementation to increase fatty acid oxidation is weak.