Key companies in the market include Ipsen, Roche, Nippon Kayaku, DSM Nutritional Products AG, Jiangsu Zhengda Qingjiang Pharmaceutical, Tonghua Maoxiang Pharmaceutical, Shandong New Era Pharmaceutical, Anhui Huarun Jinchan Pharmaceutical, Jiangsu Shengdi Pharmaceutical, Shandong Xinqi Pharmaceutical, Shaanxi Dongtai Pharmaceutical, Jilin Aodong Medicine Yanji, Zhejiang Guobang Pharmaceutical, Zhejiang Haizheng Pharmaceutical, Yangtze Pharmaceutical Group, Ningbo Tianheng Pharmaceutical, Shanghai Pacific Pharmaceutical, Shanghai Zhaohui Pharmaceutical, Zibo Wanjie Pharmaceutical, Jiangsu Hengrui Pharmaceutical, Hainan General Tongmeng Pharmaceutical.