Aspartic acid is a non-essential amino acid. It can be found in animals and especially in sugar cane and sugar beet. Aspartic acid helps the body to eliminate harmful ammonia. When ammonia enters the circulatory system of the body, it acts as a toxic substance that can damage the central nervous system. Recent studies show that aspartic acid can increase resistance to fatigue and endurance. Scientific research confirms an increase in energy, stamina, endurance and overcoming the side effects of drug withdrawal. Aspartic acid is also beneficial for brain disorders and supports the treatment of chronic fatigue. Although aspartic acid is considered a non-essential amino acid, it also plays a major role in metabolism. Aspartic acid increases stamina. Low levels of aspartic acid can cause chronic fatigue because it leads to decreased cellular energy.