Testosterone Booster and pre workout formulation for more endurance and better workouts. High T Black is a hard core advanced natural supplement containing Fenugreek. Fenugreek has been shown to increase sexual desire, help maintain sexual health and muscle mass and support the immune system. Testosterone Boosters have been clinically proven to increase sexual libido, muscle mass, and energy levels. High T Black is a proprietary blend that includes Fenugreek, NO3XÂ® Nitric Oxide Booster and Raspberry Ketones (Razberi-K) to improve endurance and speed recovery time, as well as maximize strength before, during, and after a workout.