L-Theanine is another amino acid, in this case found in Green Tea. L-theanine crosses the brain barrier having a direct impact in the brain, most notably increasing brain serotonin and dopamine. It thus can promote relaxation and pleasure, reduce negative moods, enhance sleep, and increase motivation and attention. Studies have suggested that it might also increase memory and learning. By increasing glutathione, it can also enhance anti-oxidant activity. In Focus Clearli, L-Theanine augments the action of caffeine by helping caffeine sequester adenosine. It also is involved in creating the neurotransmitter GABA, which is why it is in Sleep Peacefulli as well.