Research topic: caffeine

caffeine , odorless, slightly bitter alkaloid found in coffee , tea , kola nuts (see cola ), ilex plants (the source of the Latin American drink maté ), and, in small amounts, in cocoa (see cacao ). It can also be prepared synthetically from uric acid . While relatively harmless, it is the most commonly used mind-altering drug in the world. When used in moderation, caffeine acts as a mild stimulant to the nervous system, blocking the neurotransmitter adenosine and resulting in a feeling of well-being and alertness. It increases the heart rate, blood pressure, and urination... Read more