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
Gleditsia sinensis Gleditsia sinensis Gleditsia sinensis is a species of flowering plant native to Asia. In China, "Gleditsia sinensis" is commonly known as "zào jiá" (). The English equivalents include Chinese honey locust (or Chinese honeylocust), soap bean and soap pod. It is one of the alleged "50 fundamental herbs" used in traditional Chinese medicine. "Gleditsia sinensis" has been used in China for at least 2000 years as a detergent. The thorns of "Gleditsia sinensis" are used as a medicinal herb in China and Korea and may have antitumor properties. The thorns of "Gleditsia sinensis" LAM. (Leguminosae) have been used in traditional