* The Ultimate Underground Testosterone Booster * Dietary Supplement What you"re holding in your hands is a bottle of one of the meanest, cruelest and baddest testosterone boosters the planet has ever seen: T-Up Black. We went down to the lab and cooked up a monstrous blend of beyond extreme testosterone boosting compounds. The effects of the sodium d-aspartic acid in this wicked formula are supported by science: In one study, the sodium d-aspartic acid used in T-Up led to an average 42% increase in testosterone after only 12 days of use.† Get ready for a significant testosterone surge and muscle gains with T-Up. Where underground and science collide! †Topo et al., 2009 reprod biol endocrinol. 200, 7:120. Study lasted 12 days and showed an average increase of 42% in total testosterone levels. The effects of D-Aspartic acid on free testosterone were not investigated. Although only free testosterone provides the muscle enhancement and other benefits associated with testosterone, many experts agree that an increase in total testosterone is accompanied by a similar increase in free testosterone. Swerdoff et. al. 2000. J clin endocrinol metabolism 85:4500. Scientific research has shown that the sodium D-Aspartic Acid in T-up can be stored in the body and continues to keep testosterone levels elevated for several days even after study participants stopped taking it, Supporting the conclusion that the testosterone boosting effects of this product will build up with time.