DAA Xtreme Prolact Block Prolactin inhibitor in a testosterone booster. Today, sports that rely on strength or speed training link training results to the bodys testosterone levels. A common drawback of products aimed at increasing androgen levels is the simultaneous increase in estrogen levels, which stimulates the secretion of prolactin by the pituitary gland. The negative consequences of elevated prolactin levels can include reduced testosterone levels, erectile dysfunction, permanent hypogonadism, as well as reduced testosterone levels and libido. Olimp Sport Nutrition® has developed a new formula for T-boosters, which refers to DAA Xtreme PROLACT-BLOCK. How it works: The presence of D-aspartic acid (DAA) in the body, which occurs naturally in endocrine cells, the adrenal glands, the pancreas, the thyroid, the parathyroid, and the pituitary gland. The highest concentration of this amino acid was observed in the testicles and in venous blood plasma. DAA plays a role in regulating testosterone production and the development of muscle mass. DAA Xtreme PROLACT-BLOCK provides a daily dose of DAA that is higher than the dose that has been shown to be effective in studies.