L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe The Science of Carnitine: How It Works and Why It Matters Full article: Effects of high dose L carnitine supplementation on diaphragmatic function in patients with respiratory failure: A randomized clinical trial Role of carnitine in disease Nutrition & Metabolism Springer Nature Link 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.