What green tea is? Green tea is a drink made from the dried leaves of the Asian plant Camellia sinensis. This tea is drunk widely across Asia. The rates of many cancers are much lower in Asia than other parts of the world. Some people believe this is because of the high intake of green tea.
You may also hear green tea called Chinese tea. The substance in green tea that researchers think is most helpful is called epigallocatechin-3-gallate (EGCG). EGCG is available as green tea extract which some people take as a supplement in liquid or capsules.