Caffeine is a mild stimulant which is found in the leaves, fruits, and seeds of many plants.
Tea leaves, coffee and cocoa beans, as well as kola nuts all contain caffeine. In 1987 the US Food and Drug Administration found no evidence that normal caffeine intake produced any increased risk to health. The American Medical Association came to a similar conclusion in relation to the health and safety of drinking coffee. Two studies in Norway and Hawaii found no relationship between coffee intake and cancer risk, confirming the stance of the American Cancer Society that there does not seem to be any relationship between caffeine and cancer. However, different individuals react differently to caffeine.