The amino acid D-Aspartic Acid exists in the reproductive and central nervous tissues. It is responsible for regulating hormones in the body and developing the nervous system. When taken as a supplement, it may increase certain hormones in the brain that will result in testosterone production. This could increase energy and stamina levels, enhance exercise endurance, improve sporting performance and increase the libido. D-Aspartic Acid powder can be mixed in liquid and taken with or without food.