Aspartic acid is known to increase stamina and reduces fatigue as well. It is thought, that chronic fatigue may be a result of low levels of aspartic acid. It protects the liver by removing excessive amounts of ammonia. It synergistically plays a role with other amino acids, working with them to remove and absorb toxins from the bloodstream. It plays a key role in the function of RNA and DNA, which carry genetic information needed for cell replication. It plays a role in the immune system by promoting the production of immunoglobulins and antibodies.