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
Camellia taliensis is the tea variety traditionally cultivated in Yunnan. Like "C. sinensis, C. taliensis" contains both theanine and caffeine. "C. talensis" can be easily crossed with "C. sinensis," and the resulting crossbred plants are intermediate between species both morphologically and chemically indicating true hybrids. "Camellia taliensis" is locally used to make white tea, black tea, and pu'er tea. Yue Guang Bai (月光白 "Moonlight White") is a white tea made from the plant. Yunnan pu-erh tea made from "C. taliensis" can command a much higher price than pu'er made from the more common "C. sinensis." Camellia taliensis Camellia taliensis (also Yunnan large