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woman standing over squat barL-Aspartic Acid is a nonessential amino acid that is used to create other amino acids and also as part of the krebs cycle of energy production.  Aspartic acid is also a neurotransmitter that can increase mental acuity.  As a performance enhancement agent, aspartic acid has many studies showing it to increase performance and reduce fatigue. It was shown in one study to delay the use of muscle glycogen and increase time to failure in rats (1).  Other studies however show mo ergogenic benefit, so certainly it requires further study to validate the full effects (2,3).  Aspartic acid is also used often to chelate minerals, giving them increased bioavailability.  Aspartic acid has a tart taste and is usually found in other mixed amino acid drinks.

L-Aspartic Acid may convert partially to D-Aspartic Acid, but they are not the same. D-Aspartic Acid has shown the ability to raise testosterone levels in healthy men by 42%.   These two amino acids should not be confused.


1: Int J Sport Nutr Exerc Metab. 2003 Mar;13(1):65-75.// Links

Effect of aspartate and asparagine supplementation on fatigue determinants in intense exercise.

Laboratory of Experimental Nutrition and Metabolism Applied to Physical Exercise in the Physical Education and Sport School at São Paulo University, Brazil CEP 05508-900, São Paulo, Brazil.

2: Eur J Nutr. 1999 Dec;38(6):263-70.

Chronic arginine aspartate supplementation in runners reduces total plasma amino acid level at rest and during a marathon run.

3: Int J Sports Med. 1983 May;4(2):119-23.// Links

The effects of oral administration of salts of aspartic acid on the metabolic response to prolonged exhausting exercise in man.


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