L-Carnitine What it does

A growing body of evidence indicates that carnitine is also
important in carbohydrate metabolism. One such study assessed
the relationship between muscle carnitine levels and the
activities of various metabolic pathways in muscle3. As
expected, the carnitine concentration of skeletal muscle was
found was found to be directly related to the speed at which fat
was converted to carbon dioxide (via beta-oxidation) ie.
increased carnitine levels in the body increases the performance
of your fat metabolism whilst exercising.