What is D-Aspartic Acid? D-Aspartic Acid by Nutricost is 100% pure D-Aspartic Acid. D-Aspartic Acid is commonly known as D-AA or DAA. D-AA is an amino as that is used widely in testosterone boosting supplements. As men age, the testosterone levels lower and the metabolism gets slower. This leads to muscle mass declining and fat tissues becoming more prevalent on the body.
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