USNs Testo Tribulus contains a formulation of Tribulus Terrestris, a testosterone booster which has been found to increase strength and muscle mass. Testo Tribulus also contains ZMA, a patented ingredient containing a highly bioavailable source of Magnesium, Zinc and Vitamin B, which work together to promote effective protein and energy metabolism, maintain normal testosterone levels in the body and promote endurance.Ingredients Magnesium, Zinc and Vitamin BFree From