The average consumer will have around 240 mg of caffeine per day to increase mental alertness and focus. While caffeine has therapeutic benefits, it can also cause unwanted side effects, i.e. the nervous jittery feelings that make it hard to sit still and concentrate. A contradiction like this has invited further research into new botanical ingredients. The results of these studies find that caffeine from the Amazonian Guayusa plant can produce a brighter, more focused energy experience.
Check the attached article for background information about the working of guayusa and caffeine.