What Is Carnitine and Why Is It Important? The Amino Company Role of carnitine in disease Nutrition & Metabolism Springer Nature Link Myth: It's just caffeine, like coffee, right? Reality: Energy drinks can contain up to 5 times the caffeine of a cup of coffee plus added stimulants that strain the heart. These drinks L Carnitine in Mitochondria Encyclopedia MDPI 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.