L Carnitine 1500 mg with Vitamin B Promote Physical Performance MaxionNutrition Creatine & Acetyl L Carnitine Energy Plus, 0.51 lb Life Extension 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