The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications Propionyl l Carnitine Improves Postischemic Blood Flow Recovery and Arteriogenetic Revascularization and Reduces Endothelial NADPH Oxidase 4Mediated Superoxide Production Arteriosclerosis, Thrombosis, and Vascular Biology L carnitine helps transport fatty acids into the mitochondria, where they are used to produce energy, supporting fat metabolism and overall energy levels.