Olipop

The closest thing here to a drink that tastes like actual soda rather than a supplement — the vintage cola plays cinnamon against vanilla, and the root beer comes off lighter and less syrupy than the original. Its OLISMART blend is the most elaborate on the shelf: cassava root fiber, chicory root inulin and Jerusalem artichoke inulin alongside nopal cactus, marshmallow root, calendula flower and kudzu root. Check which can you grab, because the fiber differs — refrigerated cans carry noticeably more fiber than the shelf-stable version, which swaps in acacia and guar fiber for the chicory and artichoke blend. With a lineup spanning classic soda styles to more inventive combinations, it also has one of the widest flavor ranges of any prebiotic soda brand. If you are buying one prebiotic soda to find out whether the category is for you, buy this one.