Optimum nutrition gold standard pre workout is a unique blend of high quality caffeine creatine beta alanine cirtulline and l carnitiner pre workouts are known for making you gain lots of energy crazy pumps and insane focus well gold standard pre workout does just thatr it contains 175mg of caffeine caffeine is known to help with mental focus and alertness making you just focus on the goals ahead it also increase energy making you want to smash through trainingr optimum nutriti