Does L Carnitine Cause Heart Problems? l Carnitine and heart disease ScienceDirect L Carnitine Benefits, Uses, Dosage, Foods, Side Effects Dr. Axe 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. Exome sequencing identifies primary carnitine deficiency in a family with cardiomyopathy and sudden death European Journal of Human Genetics