L-TheaninePure Encapsulations L Theanine provides Suntheanine, a patented and clinically researched form of L Theanine amino acid naturally found in green tea. This hypoallergenic supplement comes in easy to swallow capsule form for convenient daily use. Each capsule contains L Theanine in the form of Suntheanine, a pure amino acid that has been extensively studied for its ability to promote alpha brain wave activity while maintaining mental clarity and focus