L-carnitine is a type of carnitine, which is a derivative of amino acids. Amino acids combine to make proteins, which carry out many essential tasks in the body. Carnitine helps the body break down fatty acids and turn them into energy to power the cells. When you are in a fasted state, this can be very helpful for keeping up steady energy, endurance, and expediting fat loss naturally. It also helps to reduce muscle soreness and boost physical performance.