Light and tart, with subtle hints of ginger, our refreshing, bright grapefruit is lip smackingly good.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.