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 oil is a sweet seasoning and cooking oil made by pressing the seeds of "C. oleifera", "C. japonica", and to a lesser extent other species such as "C. crapnelliana", "C. reticulata", "C. sasanqua" and "C. sinensis". Relatively little-known outside East Asia, it is the most important cooking oil for hundreds of millions of people, particularly in southern China. Camellia oil is commonly used to clean and protect the blades of cutting instruments. Camellia oil pressed from seeds of "C. japonica", also called tsubaki oil or tsubaki-abura (椿油) in Japanese, has been traditionally used in Japan for hair care. The camellia