The most popular green tea beverage in Japan, Oi Ocha is brewed from prime first flush green tea leaves,meaning it is a brew of the finest quality leaves, from the first harvest of the spring. Brisk and refreshing, Oi Ocha offers an authentic Japanese taste, the result of our patented Natural Clear production method, which yields superb clarity and a natural green tea taste. Unsweetened. No calories. With more than 100% RDA of Vitamin C.