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 L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe Acetyl L Carnitine 500 mg, 100 capsules Life Extension The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation