Hordeum vulgare, or barley, is an annual grass originating from the Middle East but is now widely grown in temperate regions of the world. Tea made of roasted barley has been enjoyed in Korea, China, and Japan. Especially in Korea, it is regarded as healthy water with a rich and savory taste regardless of the season. Barley contains proteins, dietary fiber, vitamins (especially B), and minerals. The dietary fiber of barley is high in β glucan, which helps lower cholesterol levels. Also, it is used to heal edema and burns. Abundant phenolic compounds in barley are responsible for anti-oxidant effects.