Caffeine is a white powder with a bitter substance in the medical Xanthine. Features of these substances affect the brain stimulation could also bronchodilators and diuretics as well. Caffeine is absorbed well from all parts of the gastrointestinal tract. The small intestine is the most absorption because the absorption area. And it will be absorbed into the blood stream within the body no more than 1 hour, but if we get caffeine go hungry, empty stomach or are to be absorbed into the bloodstream within 30 minutes. Because of this reason, it makes sense perky up immediately after getting caffeine into. Caffeine will spread to the brain, heart, liver and kidneys quickly. It was also distributed to all parts of the body. Caffeine effects on the body for about 3-6 hours. Usually does not accumulate in the body and is metabolized by the liver and excreted in the urine. Caffeine decreases with the drugs or substances such as removal of caffeine pills with alcohol, caffeine Estradiol may accumulate in the body. To be undesirable if consumed too much like shaking hands, dizziness, headache, etc.