The substance belonging to the alkaloids (also caffeine, theine) belongs to the psychotropic (affecting the human psyche) substances from the group of stimulants. In its pure form it appears as a white, odourless, crystalline powder with a bitter taste. Caffeine is the stimulating component of cola (Coca Cola, Pepsi Cola etc.), coffee, tea and energy drinks and is also used to flavour wine-based drinks (not wine) or by using cola in mixed wine drinks. Above 150 mg/l this must be declared on the label by the statement "increased caffeine content". See also ADI (Acceptable Daily Intake).