Carnitine as a compound is very similar to vitamins, and is synthesized from the amino acids lysine and methionine in the body.  Carnitine is found mainly in bones and heart muscles and plays an important role in energy production.  In cells, it is required for the transport of fatty acids into the mitochondria for the pro

duction of metabolic energy.  Carnitine is found in supplements in three main forms: L-carnitine,  propionyl-L-carnitine and acetyl-L-carnitine.

These charateristics lead Carnitine to be a very popular supplement, with many believing it promotes growth and development after a workout.   It has also been taken to increase fat burning and as a diet-aid because of its role in increasing the efficiency of the body to use fat as a fuel for energy. Regular supplementation of L-carnitine contributes to better energy metabolism and neurotransmitter function in the brain.

Some individuals may suffer from dietary defeciencies in carnitine or have trouble absorbing carnitine from food sources.  These deficiencies can be caused by liver or kidney problems, high-fat diets, certain medications, genetic disorders, and low dietary levels of the amino acids lysine and methionine and can cause symptoms such as fatigue, chest pain, muscle weakness and confusion.  Supplementing with L-carnitine can help in these cases.