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 Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health L Carnitine Benefits: A Complete Research Based Guide L Carnitine is Underrated. New Meta Review Reminds Us Why. The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link