Tribulus is a food supplement that some athletes use to enhance performance. A study1 on the effects of this supplement involved randomly assigning athletes to take the supplement for a day period and comparing various characteristics to similar athletes who were not given Tribulus. One of the measurements was anaerobic alactic muscular power (AAMP) where the Tribulus group showed a mean performance of with a standard deviation of while the control group had a mean AAMP of with a standard deviation of:.