Optimum Nutrition Gold Standard Pre-WorkOut Watermelon (330g). May provide support for energy, focus, power & performance. Contains 175mg of caffeine from natural sources. Fresh watermelon flavour. This formula provides you with the essential ingredients to achieve your true strength including 175 mg of caffeine from natural sources to help increase alertness and focus in the gym. Gold Standard Pre-Workout is made with premium ingredients including creatine for power & increased physical performance in successive bursts of short term, high intensity activity and vitamins B1, B3, B5, B6 and B12 which all contribute to normal energy yielding.. Optimum Nutrition also includes foundational ingredients; CarnoSyn® Beta-Alanine, Citrulline, L-Carnitine & N-Acetyl-Tyrosine which are combined to make this a Gold Standard perfectly engineered formula. This formula has also raised the bar on flavour, setting the Gold Standard for both performance and taste.. Not intended for use by persons under the age of 18.