Revisiting the Role of Carnitine in Heart Disease Through the Lens of the Gut Microbiota Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health Frontiers L carnitine prevents lenvatinib induced muscle toxicity without impairment of the anti angiogenic efficacy 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