Japanese Green Tea and Caffeine
Japanese green tea contains caffeine. It also (unlike coffee) contains the naturally produced amino acid L-theanine.
The L-theanine-caffeine combination is significant. L-theanine mitigates the negative aspects of caffeine, such as anxiety, increased blood pressure and diminished sleep quality, while improving upon the positive aspects. Its ability to enhance attention, over and above that of caffeine alone, has been repeatedly verified.
The combination of caffeine and L-theanine in green tea and matcha stimulates your mind without the jangling effect of other caffeinated beverages like coffee.
Drinking green tea gives you a state of relaxed awareness.