Caffeine, is a naturally produced medicine from the seeds and leaves of many plants. It is also produced unnaturally to add to certain foods. Caffeine is termed as a medicine because it arouses the central nervous system, causing enhanced alertness. Caffeine gives most people a short-term energy boost and bump up mood. Caffeine is present in tea, many soft drinks, coffee, chocolate, and pain relievers and other over-the-counter medicines. Caffeine tastes very bitter in its natural form. However, most caffeinated drinks undergo processing to cover-up the bitter taste. You may feel caffeine’s effects for up to 6 hours though it is not stored in the body.