This comprehensive review published in 2018, examined the role of L-carnitine supplementation relating to a number of health parameters. Aerobic capacity, fat oxidation, maximum oxygen uptake and physical performance. Authors concluded that L-carnitine supplementation may be an option for management for those facing lean muscle mass and function decline, reduced muscle L-carnitine content and mitochondrial dysfunction can also benefit from the positive impact of supplementation with L-carnitine.
References:
Fielding R, Riede L, Lugo JP, Bellamine A. l-Carnitine Supplementation in Recovery after Exercise. Nutrients. 2018 Mar 13;10(3):349. doi: 10.3390/nu10030349. Erratum in: Nutrients. 2018 Apr 26;10(5): PMID: 29534031; PMCID: PMC5872767. https://pubmed.ncbi.nlm.nih.gov/29534031/