We asked registered dietitians to explain green tea's caffeine content, factors that affect how much caffeine is in each cup, and how green tea stacks up to other caffeinated drinks. Green tea ...

One of the most popular coffee alternatives is matcha. This Japanese style of green tea has a lower caffeine content and contains L-theanine, which is claimed to provide focus and calm. “ ...

It's grown and prepared in a way that makes it different from regular green tea, with a higher caffeine content. "In the few weeks leading up to harvest, tea plants are covered to avoid direct ...