USNs Testo Tribulus contains a formulation of Tribulus Terrestris, a testosteron-e 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 testosteron-e levels in the body and promote endurance.Ingredients Magnesium, Zinc and Vitamin B