Carnitine Wikipedia Your body already makes L Carnitine, so why do people take it as a supplement? Because while it helps burn fat for energy, it only works when paired with the right lifestyle., So before you jump on Did you know: L Carnitine can be found in two of our weight management recipes. L Carnitine is a vitamin like substance that aids in the utilization of fatty acids for energy and helps normalize Effect of Acute and Chronic Oral l Carnitine Supplementation on Exercise Performance Based on the Exercise Intensity: A Systematic Review