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 What Is Carnitine and Why Is It Important? The Amino Company Carnitine metabolism in hypertensive heart failure Hypertension Research 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.