Optimum Nutrition Gold Standard Pre Workout Green Apple Flavour is used for supporting energy, focus, endurance and overall workout performance before workout. It is a premium sports supplement designed to prepare the body before physical training. It combines caffeine from natural sources, L-citrulline, creatine, and key vitamins that can help in maintaining energy, focus, and endurance. It is not a sole source of nutrition and should always be consumed with a balanced diet and proper exercise routine.