Zhejiang Tianrui Chemical CO., Ltd., situated in south industrial zone of Longyou county, Zhejiang province, China, is a high-tech enterprise, specializing in R & D, production, sales and technical services of L-Theanine, L-Pyroglutamic acid, L-Glutamic acid，L-Asparagine ,D-Aspartic Acid etc. Our plant is designed, built and operated according to the standards of pharmaceutical enterprises.  Our products obtained FDA GRAS, HACCP, KOSHER, HALAL and other international certificates. We are authorized to the right of import and export, established business relationships with companies from more than 30 countries and areas, with good reputation. Adhering to the top R & D capacity and the excellent quality, we are the largest professional L-Theanine, L-Pyroglutamic acid, L-Glutamic acid,L-Asparagine ,D-Aspartic Acid etc with top productivity and sales in China, gradually establishing brand advantage.