Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis 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 Neuroprotective Effect of L carnitine. Focus on Changing Mitochondrial Function Research Results in Pharmacology Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health Acetyl L Carnitine 500 mg L Carnitine Protocol for Life Balance l carnitine: Nutrition, pathology, and health benefits ScienceDirect