Zhejiang Tianrui Chemical Co., Ltd. is located in the Longyou Provincial Economic Development Zone in Zhejiang Province, China. It is a national high-tech enterprise mainly engaged in the research and development, production, and sales of L-theanine, glutamic acid series products, aspartic acid series products, aspartic acid chelates, threonic acid chelates, composite amino acids, and protective amino acids. The company has designed, constructed, and operated according to the standards of pharmaceutical enterprises, and established a comprehensive production control and quality assurance system in accordance with the regulations of ICH O7. The company has passed FSSC22000 food safety management system certification