Hebei Yuxing Bio-Engineering Co.,LTD. is  a  professional and the biggest factory in the world that produces Vitamin B12. Our productivity is 12 tons per year . We can offer you high quality products: Cyanocobalamin (Assay>98.5%, Related substances<2%, Loss on drying<3%), Mecobalamin(jpxiv), Hydroxocobalamin, Vitamin B12 Food Additive, Vitamin B12 Feed Additive