L-Carnitine fumarate is a specific type of L-Carnitine that is said to be especially good for both metabolizing fat and sending plenty of oxygen to the heart, both valuable properties for athletes. As a result it is a popular nutritional supplement.

Fumarate, or fumaric acid, is an important compound, which is naturally present in the body where it plays a key role in generating energy. In combination with l-carnitine, it provides dual support for energizing the heart and muscles, unlike most forms of carnitine.