Being one of the major manufacturers of Vitamin C and its derivatives in China, Hulong pharmaceutical of Donda Chemical boasts an annual output of 10,000 tons with other products, such as Sodium Ascorbate,. Calcium Ascorbate & Coated Ascorbic Acid We strictly observe the GMP in our production management, and adhere to the Chinese pharmacopoeia in quality control that is in compliance with the pharmacopoeia of both British and the States. We have been through the ISO9001 and obtained the KOSHER, HALAL certificates.