... .Certifications:USP, HACCP, HALAL, KOSHER, ISO14001, ISO22000, 3.Complying with FCC & Chinese Pharmacopeia L-Theanine L-Theanine can be ... Specific Rotation, Top Quality√ First domestic L-Theanine manufacturer through USP auditAbout Us:Zhejiang Tianrui Chemical CO., Ltd., ... advantage. Leading TechnologyWe specialized in production of L-Theanine for many years, with competitive advantages in technology. ...