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 — 9 grams in the refrigerated original, 6 grams in the shelf-stable version, which swaps acacia and guar fiber in for the chicory and artichoke. With 19 core flavors it also has the widest range of any prebiotic soda brand. If you are buying one prebiotic soda to find out whether the category is for you, buy this one.