The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation Diet Induced Insulin Resistance Encyclopedia MDPI Frontiers The effect of L carnitine supplementation on lipid profile in adults: an umbrella meta analysis on interventional meta analyses The Importance of the Fatty Acid Transporter L Carnitine in Non Alcoholic Fatty Liver Disease (NAFLD) July 2020 : r ketoscience L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. Benefits of Acetyl L Carnitine Simply Supplements