It acts as a stimulant on the brain.
Caffeine occurs naturally in foods and beverages.
It is found in coffee, tea, soft drinks, cocoa, chocolate, and kola nuts. Trimethylxanthine is added to caffeinated sodas during processing. Some weight-loss products, pain medicines , and cold remedies contain caffeine. The caffeine content of coffee depends on the type of coffee bean. Beans from the plant species robusta generally have more caffeine than those from the arabica species.