Thank you for reading this letter. I am your old friend, Gao Yong ,from Ningxia Kingvit Pharmaceutical Co.,Ltd. I used to work for Hebei Yuxing.Our company specializes in the production of vitamin` B12 series, Cyanocobalamin, vitamin` B12 feed grade, vitamin` B12 food grade, Mecobalamin.Our company has a technician and salesman team that has a long-term experience in producing vitamin` B12 ,can provide the best service for you.Our factory has world-class production equipments and testing instruments, such as HPLC, gas chromatograph, atomic absorption spectrophotometer, Infrared spectrometer, plasma emission spectrometer. The production process is according to GMP requirements. We have passed the certification of OU,FAMI-QS. Our products can comply with EP, USP,BP,JP,IP,CP. If you are interested in vitamin` B12 series, please let me know. I'll give you a satisfactory answer and service.We look forward to receiving your enquires soon.