Based on the incredible results of a recent ground-breaking study conducted in Italy, D-Aspartic Acid (DAA) has caught the attention of nearly every supplement researcher on the planet right now. DAA is a physiological amino acid occurring principally in the pituitary gland and testes and has a vital role in the release and synthesis of luteinizing hormone (LH) and testosterone in humans. The only form of DAA used in SD Pharmaceuticals" D-Aspartic acid DAA is 100% pure d-aspartic acid calcium chelate, which is the most effective form available, with even greater bioavailability than sodium-d-aspartic acid. To get the most out of d-aspartic acid you must use a form that"s highly soluble and bioavailable so it can get to the testes and pituitary gland and do its job and stimulate more testosterone release. Regular sodium-d-aspartic acid has very bad solubility, which means poor bioavailability. By creating a calcium chelate, the solubility of DAA is increased by over 200%, which means significantly greater bioavailability and uptake into the testes and pituitary gland. The end result - greater total testosterone production.