Carnitine Deficiency: What Is It, Causes, Symptoms, and More Osmosis L carnitine supplementation in non alcoholic fatty liver disease: A systematic review and meta analysis The Science of Carnitine: How It Works and Why It Matters Role of carnitine in disease Nutrition & Metabolism Springer Nature Link L Carnitine is an amino acid found in high concentrations in muscle, heart, and liver tissues. Inside the cells, L Carnitine transports fatty acids into the mitochondria for energy production (i.e., ATP) and reduces