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USN B4 Bomb Blue Raspberry is a powerful pre-workout supplement designed to boost energy, focus, and muscle pump before training. It contains 200 mg caffeine, 6000 mg L-Citrulline Malate, 2000 mg Beta-Alanine, and Creatine Monohydrate. These ingredients help improve endurance, workout performance, and motivation during exercise. It is usually taken 25–30 minutes before training, and the Blue Raspberry flavor is one of the most popular options.