Topstone Industries Co., Ltd. The company was founded in 2006 in Shanghai, China. It has become as one of the leading suppliers of the pharmaceutical industry in China. Our product lines include API, pharmaceutical intermediate, finished drug, excipient, and pharmaceutical packing material. Also, we focus on exporting business to oversea markets, dealing with international trade, market promotion, product distribution and customized contract synthesis of the pharmaceuticals. Our products are manufactured under GMP conditions and USP/BP standards. The products are distributed to US, EU, South Asia, and Middle East markets to manufacturers, importers, and laboratories.