L-Carnitine is an amino acid that is found in the body. It is often taken as a weight loss supplement. It plays a critical role in energy production. L-Carnitine transports long-chain fatty acids into the mitochondria so they can be oxidized or burned to produce energy. It is important for heart and brain function, muscle movement, and many other body processes.
The FDA has approved L-carnitine for treating L-carnitine deficiency caused by certain genetic diseases in specific related to the heart. Its also used to help with anorexia, chronic fatigue syndrome, diabetes, overactive thyroid, attention deficit-hyperactivity disorder (ADHD), leg ulcers, Lyme Disease, and to improve athletic performance and endurance.