I'd recommend you take it anywhere from a half an hour to an hour after working out. Usually it will give you suggestions on the label of the carton. I take it anywhere from a half an hour to 2 hours after working out. But, about a half an hour after working out is best. But, some proteins are supposed too be taken before working out. Usually you can use your whey before for more energy during workouts, or after for rebuilding the muscle. I personally don't need energy while working out all i have with me is a gallon of water, dedication and drive .