Phenolic content in tea green tea. Catechins constitute about 25% of the dry mass of a fresh tea leaf, although total catechin content varies widely depending on species, clonal variation, growing location, season, light variation, and altitude. They are present in nearly all teas made from "Camellia sinensis", including white tea, green tea, black tea and oolong tea. Of all the catechins in tea, EGCG is the main subject of scientific study with regard to its potential health effects. 4-Hydroxybenzoic acid, 3,4-dihydroxybenzoic acid (protocatechuic acid), 3-methoxy-4-hydroxy-hippuric acid and 3-methoxy-4-hydroxybenzoic acid (vanillic acid) are the main catechins metabolites found in humans after consumption of green
Chinese tea zhēnméi), Sowmee (秀眉 xiùméi), Pekoe (白毫 báiháo), Keemun (祁門紅茶 qímén hóngchá). Chinese tea Chinese tea is a beverage made from the leaves of tea plants ("Camellia sinensis") and boiled water. Tea leaves are processed using traditional Chinese methods. Chinese tea is consumed throughout the day, including during meals, as a substitute for plain water, for health, or for simple pleasure. The practice of drinking tea has a long history in China, having originated there. Although tea originated in China, during the Tang Dynasty, Chinese tea generally represents tea leaves which have been processed using methods inherited from ancient China. According