Ultra Micronized Max Bioavailability. Boost Natural Testosterone. Increase muscle strength. Stimulate growth hormone. D-Aspartic Acid Increases Natural Testosterone Production. DAA accumulates in the testes and may activate the leydig cells to create more natural testosterone. It may also have action in the central brain region and activate the pituitary gland to initiate more natural hormone production. Increased Testosterone Levels. Testosterone has a positive effect on strength, stamina, lean muscle retention, and fat loss. Increased testosterone and GH levels have a dramatic impact on metabolism and fat loss.