4. Other Xanthines
Even more exciting, is the fact that many other xanthines are also present in a lot green teas, providing us with a natural combination that can make us significantly more alert, more focused and more intelligent (in some capacities at least).
This is particularly true of the popular drink ‘yerba mate’. This is a form of green tea that Darwin famously called the ‘perfect stimulant’. Today, many health bloggers and productivity gurus recommend the drink, including author Tim Ferriss!