Serene Science. 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 neurotransmitter levels in the brain and inhibit the stimulatory properties of caffeine.
"I use this each morning and feel calmer and yet more energetic since I started taking it, over a year ago. Recommended to me by bro-in-law who is a doctor. My doctor is fine with my taking it. Will continue to use it and have recommended it to others as well."