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. L carnitine tartrate supplementation in the fight against infectious disease Usefulness of Carnitine Supplementation for the Complications of Liver Cirrhosis In an 80 year old woman with suspected urosepsis and possible impaired renal function, should L carnitine be administered intravenously for severe leg muscle pain?