Usefulness of Carnitine Supplementation for the Complications of Liver Cirrhosis What is carnitine? Carnitine is produced in the body from the amino acid lysine and naturally occurs in some foods. It supports energy metabolism and muscle function, which are important factors in Acetyl l carnitine deficiency in patients with major depressive disorder PNAS The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation Acetyl L Carnitine: Benefits and Side Effects Gene Food