The tea fungus known as kombucha is celebrated worldwide for its ability to aid digestion, eliminate toxins, support the immune system, and boost energy. Kombucha is fermented in sweetened black tea, a process that converts it into beneficial enzymes, acids, and vitamins. The result is a beverage that's naturally healthful, tangy, and delicious. Here, writer Klaus Kaufmann discusses the health benefits of kombucha and its historical uses.