Caffeine crystals. Polarised light micrograph of crystals of caffeine (1,3,7-trimethylxanthine). Caffeine stimulates the central nervous system increa


Caffeine crystals. Polarised light micrograph of crystals of caffeine (1,3,7-trimethylxanthine). Caffeine stimulates the central nervous system increasing alertness and deferring fatigue. Caffeine is also a diuretic (increases the removal of water from the body) and has laxative properties. It is widely known for its presence in coffee beans and tea leaves.


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Photo credit: © DAVID PARKER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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