How Much L Carnitine Should I Take? A Guide The Science of Good Health Carnitine: Genetic Variants Affecting Mitochondrial Energy and Health New study links L carnitine in red meat to heart disease Harvard Health L Carnitine Linus Pauling Institute Oregon State University The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation 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.