Hyperpolarized [1 13C]Acetyl l Carnitine Probes Tricarboxylic Acid Cycle Activity In Vivo ACS Sensors Targeting Skeletal Muscle Dysfunction With L Carnitine for the Treatment of Patients With Chronic Obstructive Pulmonary Disease In Vivo L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. L Carnitine is Underrated. New Meta Review Reminds Us Why.