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Aspartic acid is a nonessential amino acid, which means that it is manufactured from other amino acids in the liver; it does not have to be obtained directly through the diet. Aspartic acid is very important in the urea cycle for the proper elimination of waste products from dietary protein. Poor control of the urea cycle may be related to symptoms such as chronic headache, fatigue, irritability, lack of concentration, mental confusion, and intolerances to various foods, particularly high protein foods. Deficiencies of a nonessential amino acid will not occur if a well-balanced diet is consumed because the intake of proper foods will allow the body to produce exactly the amount of amino acid required to function optimally. Aspartic acid has been used as mineral salts such as magnesium aspartate or potassium aspartate to help improve energy production in exercising muscles.