Caffeine is a bitter white crystalline xanthine alkaloid and a stimulant drug. Caffeine is found in varying quantities in the seeds leaves and fruit of some plants where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants as well as enhancing the reward memory of pollinators.
This page contains content from the copyrighted Wikipedia article "Caffeine"; that content is used under the GNU Free Documentation License (GFDL). You may redistribute it, verbatim or modified, providing that you comply with the terms of the GFDL.
