Caffeine is one of the most comprehensively studied ingredients in the food supply.
There is considerable knowledge of this compound, with centuries of safe consumption in foods and beverages. However, some questions and misperceptions about the potential health effects associated with this ingredient still persist. Caffeine is a naturally occurring substance found in the leaves, seeds or fruits of at least 63 plant species worldwide. The most commonly known sources of caffeine are coffee, tea, some soft drinks and chocolate. The amount of caffeine in food products varies depending on the serving size, the type of product and preparation method.