Theanine, The Relaxation Amino Acid by Dr. Billie J. Sahley, Ph.D., C.N.C. Learn about Green Tea and Theanine, a new amino acid. Theanine produces alpha waves in the brain that puts you into a relaxed state like deep meditation without drowsiness. Green Tea has been used in Asian countries for thousands of years. Now science is catching up, and there is documented research showing the importance and diversity of Green Tea and Theanine. This book contains the latest research to give you the most up-to-date information for your health. Dr. Sahley spent over a year studying the research and writing this concise, yet informative, book. Theanine * Diminishes symptoms of PMS, depression and irritability * Enhances memory and concentration * Superior to St.