Now Sports Tribulus Extreme blends the power of tribulus with other complementary herbs to create a product that targets male performance and endurance. Tribulus has a long history of use by men to promote strength and vitality, and modern research indicates that it may help to promote normal endocrine function and male sexual health. Combined with maca and other traditional herbs, this formula is designed to promote optimal stamina and energy levels and to support a healthy libido and male sexual function.