Nutrex T-Up Mega Testosterone Booster is raising the bar in natural testosterone elevation by bringing you scientifically researched D-Aspartic Acid in a clinical amount. Unlike many products that claim to increase natural testosterone, our effects are real and supported by a clinical study. In this clinical study, the D-Aspartic Acid used in Nutrex T-Up led to an average 42% increase in testosterone after only 12 days of use. An elevation in testosterone levels is associated with more muscle gains, strength increases and enhanced recovery. Just one serving a day is needed.