The health benefits of tea are of course related to the chemical composition it contains. Tea Cyanine contains dozens of chemical components, including proteins, carbohydrates (including fiber), free amino acids, fatty acids, organic acids, plant alkaloids (including caffeine), volatile aroma components, natural pigments, minerals and many more. Phenolic compounds and the like. The highest content of these compounds, the most advanced polyphenolic compounds, account for 30% of the dry weight of tea, accounting for 60% of the water-soluble ingredients; these substances are collectively referred to as tea polyphenols, which used to be called "tea tannins", types There are also more than ten species, of which catechins are the main ones. The physiological effects of many teas come from catechins. Because green tea retains the most catechins, scientists used to use green tea as a research object. In recent years, researchers in Europe and the United States have launched research on black tea in view of the fact that black tea is the main tea drink in Western countries. It has been found that although black tea has a very low catechin content, it also has physiological effects (including anti-cancer, bad breath and Prevent heart disease, etc.). Active physiological active ingredients of black tea are currently being actively explored.