The Award-Winning, Patented Dietary Ingredient for Stress and Well-Beingyoga on the beach It has been estimated that nearly 65 percent of the adult population experiences some form of stress, and these numbers are continually rising. Since ancient times, it has been said that drinking green tea induces relaxation. A pioneer in the science of green tea, Taiyo found this relaxation effect to be due to the presence of the amino acid L-theanine. Suntheanine is produced via a fermentation process that mimics the natural process in green tea leaves resulting in a 100% pure L-isomer-theanine. It is not an extract of green tea, but rather is a patented enzymatic fermentation process using the amino acids ethylamine and L-glutamine that assures an isomerically pure L-theanine. Human clinical trials have shown Suntheanine to promote an alert state of relaxation without drowsiness. Additional human clinical research suggests that Suntheanine may have applications in improving the quality of sleep, diminishing normal symptoms of premenstrual syndrome (PMS), improving learning performance, heightening mental acuity, promoting concentration, reducing negative side effects of caffeine and supporting the immune system.