L Carnitine has become one of our top 5 sellers this year and I can see why when looking at all the research that has come out about it over the last few Understanding the Benefits and Uses of Carnitine in Health and Fitness Fitness Health The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link From brain to muscle, L Carnitine plays a key role in energy metabolism, endurance, and recovery by supporting efficient fat to energy conversion. The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation