Therefore, L-carnitine plays an important role in human metabolism. The main application fields of L-carnitine include the field of food additives, the field of feed additives, and the field of drug therapy.

L-carnitine is an important nutritional supplement for the middle-aged and elderly. Myocardial energy comes from the oxidation of fatty acids. As an important nutrient of myocardium, L-carnitine can increase myocardial capacity and lead to the increase of cardiac blood output, so it has an obvious protective effect on the heart. With the increase of age, the content of L-carnitine in the middle-aged and elderly people decreases continuously, resulting in the decline of cardiomyocyte vitality.