Tribulus Black 1300 utilizes a potent extract of 1300mg Tribulus Terrestris per serving to help support and strengthen healthy testosterone levels. It is a great natural choice for the active male to aid in vitality, muscle recovery and strength. Tribulus is very well known when it comes to the improvement of natural testosterone levels and hormone regulation. This highly studied ingredient has shown numerous times that it can positively effect muscle growth and increase sex drive within males.