Caffeine content in tea

Strong tea contains caffeine no less than coffee, but it is combined with tannin in tea, forming a compound of caffeine tannat and catechins, and acts more indirectly, more softly on the cardiovascular and central nervous system. Caffeine in this condition is called theine. The caffeine contained in coffee (which lacks a tannin-catechin complex) acts much stronger and directly on the heart, while theine primarily affects the blood vessels of the brain and central nervous system. Theine, the caffeine of tea, has another remarkable property: it does not linger, does not accumulate in the human body, which eliminates the risk of caffeine poisoning even in case of the most frequent use of tea.