D-Aspartic Acid (DAA) is one of the two forms of the essential amino acid, aspartic acid. Amino acids are commonly used to make protein in the body however DAA is unique as it aids in regulating testosterone synthesis and improving hormone function. For this reason, DAA is a popular natural testosterone booster.
As muscle growth and fat loss is directly linked to testosterone levels, higher testosterone levels can improve the ability to build muscle. By elevating testosterone levels DAA can be an effective supplement for building muscle in males.
Studies have also shown DAAs effectiveness as a fertility aid with results indicating increases in Luteinizing hormone concentration, seminal motility and improved sperm count and quality.