The one to the alkaloids counting substance (also caffeine, Thein) belongs to the psychotropic (the human psyche affecting) substances from the group of stimulants. In pure form, it comes as a white, odorless, crystalline powder bittertaste on. Caffeine is the stimulant of cola (Coca Cola, Pepsi Cola etc.), coffee, Tea and energy drinks and is also for that flavoring from wine-based drinks (not wine) or by using cola in wine mixed drinks used. Above 150 mg / l, this must be on label declared as "increased caffeine content". See also below ADI (Acceptable Daily Intake).