Calmness and Relaxation: Theanine has been shown to affect certain neurotransmitters that ease anxiety and promote calmness. It may also counter the stimulating effect of caffeine and could improve sleep quality. Benefits Heart Health: Theanine increases nitric oxide production, which improves blood vessel function and heart health. Studies have found that supplementing with theanine may also lower bad cholesterol levels and blood pressure. Improves Mood and Memory: Research suggests theanine could boost mood and improve memory, focus, and concentration. This may be due to its ability to increase serotonin, dopamine, and GABA levels in the brain. Directions: As a dietary supplement, take 200mg, 1-3 times per day to promote memory, relaxation, and better sleep.