Shandong Hengtong Biotechnology Co., Ltd., established in August 2010, is located on the National Highway 220 (G220), in Binzhou, Shandong Province,China. Developed by the current international techniques?calcium citrate, magnesium citrate and zinc citrate are insoluble, slightly soluble in water, which is difficult to absorb for human bodies, leaving their use limited. Our company, a provincial-level high-tech enterprise, is the first to produce soluble calcium citrate, soluble zinc citrate ...