An amino acid found in green tea, L-Theanine has been shown to positively modify brain waves and the key neurotransmitters involved in mood, focus and memory. L-Theanine also impacts the production of dopamine, serotonin, which plays a role in the formation of GABA. This aids in relaxation without making you sleepy. In clinical research, L-Theanine has been found to help improve attention, mood, cognition, and the quality of sleep. As a natural relaxant, L-Theanine reduces tension and promotes rest without diminishing alertness.