Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health Levocarnitine, commonly known as L Carnitine, is a naturally occurring compound that the body produces from the amino acids lysine and methionine. It plays a critical role in energy production by transporting fatty Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health L Carnitine 500 mg with Vitamin B 6 Medicine Center Pharmacy Creatine & Acetyl L Carnitine Energy Plus, 0.51 lb Life Extension