The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health Systemic regulation of L carnitine in nutritional metabolism in zebrafish, Danio rerio Scientific Reports Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window L Carnitine: Benefits, Uses, and Side Effects Lifespan Research Institute