Shandong Haineng Bioengineering Co., Ltd., located in Rizhao, Shandong province,China， is a high-tech enterprise integrating R&D, production and promotion of 25-hydroxyvitamin D3, liquid vitamin raw materials, feed additives and feed addictive premix.

With the main products focusing on liquid vitamins and 25-hydroxyvitamin D3, Haineng Bioengineering divides its liquid and powder feed premix into five series, satisfying the nutritional needs of different animals and life cycles, and has established friendly cooperative relations with nearly 100 large animal farming groups in China. The company’s “Research and Application of 25-Hydroxyvitamin D3 Production Technology” is appraised as domestic leading. The company’s 25-hydroxyvitamin D3 standards have been registered, making the enterprise one of the earliest companies that have obtained the production qualification, and the product standards have provided reference for the formulation of national industrial standards. The "25-D" has been successfully registered in many countries, and its products have gone global.