Oolong tea extract is made from the leaves of the Camellia sinensis plant, the same plant used to make Oolong, black, green teas from Fujian, China. The differences between these three kinds are mainly in processing: black tea is fully oxidized, green tea is not oxidized at all, and oolong tea is partially oxidized. While Oolong tea extract is the extract made from Oolong Tea and is consumed for its health benefits.