In today’s fast-paced society, a large portion of the adult population experiences some form of stress during their daily life. Since ancient times, it has been said that drinking green tea induces relaxation.


Suntheanine® is the trade name for our patented high purity L-isomer-specific L-Theanine (chemical name: L-glutamic acid-y-monoethylamine), a unique amino acid found in tea (Camellia sinensis). Suntheanine® is produced via a patented enzymatic method.

Suntheanine® is the original, patented, and consumer recognized high purity L-isomer-specific L-Theanine; an award-winning and patented dietary ingredient for stress, relaxation, focus and improved sleep efficiency, which is currently used around the world by food, beverage, dietary, animal health and sports nutrition brands.

What the Science Shows

Suntheanine® is the original researched and patented form of L-Theanine. All original published scientific studies, clinical trials, and safety/toxicity studies were conducted specifically using Suntheanine® brand L-Theanine; which is L-Theanine manufactured specifically using Taiyo’s original, and ground-breaking proprietary manufacturing process.

Clinical trials have shown Suntheanine® promotes an alert state of relaxation without drowsiness, enhances sleep quality, and improves focus and concentration, as indicated by an increase in Alpha brain waves, and a decrease in Beta brain waves.

Additional human clinical research suggests that Suntheanine® may have application 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.
Suntheanine® is absorbed through the brush-border membrane in the large intestine and transported directly to the brain where it stimulates the generation of Alpha brain waves.

Trust Suntheanine®

With extensive clinical research, unparalleled safety support, several international patents, and consumer brand recognition, you can trust Suntheanine® to consistently meet the high quality standards your food, beverage and supplement products demand.


Suntheanine® is Food Grade, non-GMO, and meets Kosher and Halal requirements.

Suntheanine® is Non-GMO Project Verified.

Suntheanine® brand L-Theanine is a registered trademark of Taiyo International, Inc. and is exclusively supplied by NutriScience Innovations, LLC.