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vitamin b12 injection is iv or im Methylcobalamin (Vitamin B12) MIC B12 Injection - Balance
Description
where the form is reported, it is stated in this paper

Clinical presentation and metabolic consequences in 40 breastfed infants with nutritional vitamin B 12 deficiency--what have we learned

I dont know why (nor could my doctors figure it out) but around five years ago at age 60 my body apparently stopped absorbing B12 through my digestive system

National Academies Press
