Green tea is a type of tea made from Camellia sinensis leaves and buds that have not undergone the same withering and oxidation process used to make oolong teas and black teas. It originated in China and has since spread to other countries in East Asia. Green tea is processed and grown in a variety of ways, depending on the type of green tea desired. As a result of these methods, maximum amounts of polyphenols and volatile organic compounds are retained, affecting aroma and taste. Green tea contains a type of polyphenol called a catechin, which is an antioxidant that helps prevent cell damage. The most well-known and abundant catechin in green tea is epigallocatechin-3-gallate (EGCG) . Green tea is often consumed for reasons other than its health benefits, but studies suggest that consuming green tea may positively affect skin health, help with weight loss, and reduce the risk of cardiovascular disease, among other benefits. Green tea contains caffeine, and drinking caffeinated beverages throughout the day seems to prevent a decline in alertness. Green tea is believed to be safe when used in amounts up to 8 cups per day.