Shandong Zhongyuan Greentech Co., Ltd. was established in March, 1997.Our headoffice is in Jinan Shandong Province China. After ten years of development, Zhongyuan has become top and professional manufacturer of Chondroitin sulphate in China. We are the main supplier of Chondroitin sulphate in the market of Europe and U.S.A., the brand GREENTECH has high reputation in the market of U.S.A. With ten years of production history, the manufacturing process is well optimized, and the quality of the ...