L-Carnitine
Also known as Levocarnitine, Carnitine
An amino acid derivative involved in fatty-acid transport into mitochondria, used medically for carnitine deficiency and studied for metabolism, exercise, and body composition.
Overview
L-Carnitine is not a peptide. It is an amino acid derivative that helps shuttle long-chain fatty acids into mitochondria for beta-oxidation.
The Science
Carnitine biology is real and essential, but that does not mean every injectable or supplement claim is proven.
- Mitochondrial fatty-acid transport - carnitine is part of the transport system.
- Deficiency treatment - levocarnitine has legitimate medical use in deficiency contexts.
- Body composition research - studies show mixed-to-modest results depending on population and design.
Evidence Snapshot
L-Carnitine has stronger evidence as a nutrient/deficiency molecule than as a broad fat-loss product. Route, dose, baseline status, and population matter.
References
- [1]Talenezhad N et al. L-carnitine supplementation and body composition: systematic review and meta-analysis(2020) · doi:10.1016/j.clnesp.2020.03.008
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