If you like piña coladas, then you probably like pineapple juice. But did you know that it is healthy as well as delicious? Unlike other fruit juices, pineapple juice is so sweet on its own that often no sugar needs to be added. For store-bought juice, the only substance that is normally added to it is vitamin C (ascorbic acid), to protect color and flavor. Be sure to avoid any pineapple drinks that are juice-like products and not actually juice. These drinks are just flavored sugar water.