Nutritional assessment Vitamin B12 Absorption,delivery & activation for vit B12.Vitamin B12 is the term commonly used to refer to the various chemical forms of cobalamin.It is a member of the 8 co reliant water soluble vitamins that form B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Folate normal ranges in blood work can be between 220 and 1200. I personally think anything under 600 is too low. B12 injections are the best (by pass digestion) and you can Been unwell for a year, b12 injections again even though levels are 840? : r B12_Deficiency