In this method, caffeine is extracted from tea. The type of tea that is used isn't very important (as long as it is ...

Drinking green tea with L-theanine can cause calm alertness because the caffeine in the tea wakes you up, while L-theanine promotes relaxation.

Some say the best time to drink tea is at night, but that’s only if the tea doesn’t have caffeine. Learn which teas to drink in the day and at night.