Green tea is made from the leaves and buds of the same shrub Camellia sinensis as Black tea. However, it does not go through the withering and oxidation process as Black and Oolong teas. Green tea was first produced in China but the bulk of production and manufacture now takes place in other East Asian countries. The different types of Green tea are produced by using different varieties of the tea bush, tea from different locations, different growing and processing methods. Green tea contains less caffeine than Black tea. Because it is generally drunk without milk, sugar or artificial sweeteners, it is a popular beverage for health-conscious consumers.