A vegetable alkaloid found in tea, coffee, cola, cocoa etc. A stimulant to the central nervous system. Promotes alertness, for physical & mental activity and retards sleep. One cup of tea may contain 60 - 90 mg caffeine. One cup of coffee between 90 - 150mg caffeine. Cola beverages may contain 40 - 70 mg. Toxic effects include palpitations, headache, sleeplessness, irritability, anxiety, high blood pressure.
Good alternatives are ginseng, gotu kola, guarana, German chamomile. |