Kombucha is an ancient fermented tea beverage known to have originated around 220 B.C. It is prepared by combining water, green tea, black tea, the kombucha culture (also known as SCOBY) and cane sugar after which it is let to ferment for 10-12 days. During this time the bacteria and yeast present in the culture consume the sugar and caffeine (from the tea) to produce a liquid rich in organic acids, antioxidants and trace amounts of B vitamins.