D-Aspartic Acid (DAA) is the newest natural testosterone booster on the market. DAA is the D-form of the amino acid aspartic acid. The body can produce DAA from the nonessential amino acid L-aspartic acid (the dietary form of aspartic acid). D-form amino acids, such as DAA, are found in higher concentrations in specific tissues in the body. For example, higher concentrations of DAA are found in the testes, pituitary gland, and hypothalamus (D'Aniello & Di Fiore 2000) all of which are areas involved in hormone production.
What Does D-Aspartic Acid Do?
One big difference between DAA and other natural testosterone booster is there is actually scientific data in HUMANS showing it to effectively increase testosterone levels. A study by Topo et al. showed that supplementing with 3 grams of DAA increased circulating luteinizing hormone (LH) levels by 33% and testosterone levels by 42% in men aged 27-37 years old (Topo & Soricelli 2009). Note that this increase in testosterone was in is not in healthy men with normal testosterone function, not rats or hypogonadal men! Note the increase in testosterone by 42% was after only 12 days of supplementation and testosterone levels returned to baseline three days after stopping DAA.