MuscleForce Defiant Unleashed is one of the most powerful pre workouts on the market. Intelligently formulated by the team at MuscleForce, Defiant unleashed gives you plenty of energy in a disciplined manor. What's that mean? Energy with focus, not jitters. Energy you can use in the gym to crush your PR's and give you some of the best workouts. Each serving has 450mg of caffeine, paired with additional focus stimulants.