L-Carnitine is a non-essential amino acid found naturally in the body and has been suggested to improve the metabolism and transportation of free fatty acids from where they are stored as subcutaneous or visceral fat, to where they are burned within the mitochondria of the muscle. In essence, L-Carnitine is known as a fat metaboliser but also offers other benefits in the reduction of oxidative stress and improved endurance capacity.

During a phase of dieting where food consumption is reduced or in particular cases whereby someone is following a vegetarian diet, is undergoing certain types of surgery or is otherwise going through a phase of systemic stress (total body stress), naturally occurring L-Carnitine levels can be diminished. As a result of this, fat metabolism can become less efficient, oxidative stress may rise and a reduction in performance can occur.