l-Theanine is an amino acid that may reduce psychological and physical aspects of occasional stress, such as anxiety and tension. Studies demonstrate that taking l-theanine increases alpha waves in the brain, which are associated with relaxation and concentration. Additionally, research indicates that L-theanine crosses the blood-brain barrier and aids in maintaining healthy neurotransmitter levels while dampening the effects of caffeine. Suntheanine® is a registered trademark of Taiyo International, Inc.*