Caffeine is a slightly bitter substance which has no smell. It is a stimulant and is found in small amounts in coffee, tea and colas. Caffeine dissolves in water that look like needles. When consumed in small amounts, caffeine increases blood circulation and is considered harmless for most people.
When taken in large amounts, however, it causes nervousness and loss of sleep. Caffeine was first extracted from plants in pure from 1820. It can now be made in the laboratory.
Caffeine is used as a stimulant of the heart and nervous system in certain disorders and is found in a number of over-the-counter analgesic preparations.
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