Green Tea has been used as both a beverage and a method of traditional medicine in most of Asia, including China, Japan, Taiwan, Vietnam, Korea and Thailand, to help everything from controlling bleeding and helping heal wounds to regulating body temperature, blood sugar and promoting digestion. . Most of the green tea polyphenols are flavonols, commonly known as catechins. It also includes flavanols, flavandiols, flavonoids, and phenolic acids; these compounds may account for up to 30% of the dry weight.