L Carnitine Benefits: A Complete Research Based Guide Is L Carnitine Safe? Watch FIRST BEFORE Taking L Carnitine Supplements If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation