How it ' s Made did an episode with Orange Juice . They explained the reason the Oxygen is removed is for preservation . Without the Oxygen the Juice can be stored for a long period of time , and large quantities can be mixed and matched so that the juice can be made available throughout the year . Otherwise , juice would only be available when Oranges were in season . The deoxygenation process removes all the flavor from the juice mix , and a formulation pack of flavor is added when the juice is ready for shipment . I can ' t find the episode that this segment was in , but I am pretty sure it was How it ' s made . It ' s main thing that changed my mind about orange juice , like Tampico , etc , and orange flavored juice , Sunny D , etc . Neither are natural and orange flavored juice often tastes better to me .