USP Vitamin B6 GMP/ISO9001 Health certificate stamped by Embassy SGS inspection COA from CIQ TNN Development Ltd. (TNN) is an export-oriented, overseas-funded enterprise established in October, 1998. TNN works closely with its business partners from Europe, Asia, North America and Africa, handling business of over 500 products including fine chemicals, dyestuff, pharmaceutical raw materials, food additives, perfumes and inorganic chemicals, related machine and its parts. TNN passed ISO 9001:2000 verification in 2006, TNN management and operation has obtained international advanced level.