SOURCE NATURALS - Serene Science L-Theanine 200 mg - 60 TabletsDESCRIPTION Focused Relaxation L Theanine is a unique amino acid found almost exclusively in the tea plant (Camellia sinensis) and contributes to the unusual taste of green tea. Human studies have shown that taking L theanine affects the emission of alpha waves in the brain associated with states of relaxation and focused attention. Preliminary research has shown that L theanine crosses the blood brain barrier, and suggests that it may support healthy