The sweet and flavorful raspberry joins forces with the sharp, tangy taste of lemon, creating a zesty smooth taste. KeVita Master Brew Kombucha is energizing with a bold brewed tea taste. Fermented with our proprietary kombucha tea culture, Master Brew has 80mg of organic caffeine in every bottle, 6X the beneficial organic acids compared to other leading kombucha brands, and 4 billion CFUs of live probiotics.