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Gold Standard Pre-Workout provides high-quality energy that helps improve endurance and focus. Each serving contains 375 milligrams of Acetyl-L-Carnitine HCL and 250 milligrams of N-Acetyl-L-Tyrosine (both amino acids to help repair and recover muscles) and 175 milligrams of naturally-derived caffeine to provide lasting energy to help you complete that extra rep, next set and reach your fitness goals. Purchase it today from optimumnutrition.com.