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
Korean tea at per capita, compared to for coffee - grain teas are served in many restaurants instead of water. Herbal and fruit teas are commonly served, both hot and cold. Korean tea Korean tea is a beverage consisting of boiled water infused with leaves (such as the tea plant "Camellia sinensis"), roots, flowers, fruits, grains, edible mushrooms, or seaweed. According to the "Record of Gaya", cited in the "Memorabilia of the Three Kingdoms", the legendary queen Heo Hwang-ok, a princess of Ayodhya, brought the "Camellia sinensis" (var. "assamica") tea plant from India to Korea and planted it on Baegwolsan, a mountain