The cutting-edge of testosterone support is now available at a low Swanson price. D- Aspartic Acid (also known as DAA) is a form of the non-essential amino acid aspartic acid found in significant concentrations in tissues involved with the production of testosterone and other influential hormones. It’s all the rage among weightlifters and athletes looking for a boost. Our D-Aspartic Acid is best taken with your morning meal and mixes easily into any beverage.