Crank up the volume in the gym with Optimum Nutrition Pre-Workout Amplifier – exclusively at Walmart. 🔊 Formulated to help you train harder for longer when used regularly over time, it delivers the ingredients you want to unlock more you! 🔐 - 300mg Caffeine - 6g Citrulline - 3g Beta-Alanine - Electrolyte Blend #OptimumNutrition #ONSupplements #Amplifier #PreWorkout #UnlockMoreYou