It is documented that the tea has a stimulant and urinant effect, due to the fiavonal. alias caffeine, in it. According to the statement of a researcher, the caffeine is not carcinogeous even at the limit of its maximum tolerance. Though the pure caffeine causes nervosity and stomach throubles, it is not responsible for such situations in the brew itself. The caffeine is a cardiac stimulant, increases the basic metabolismal rate and results in some persons in insomnia.