Doctor insights on:
What Do B12 Vitamins Do
Virtually nontoxic: At any dose. I do not believe that you will find very much written on the toxic effects of B12 although I have had a couple of patients who took something on the order of 10x what I had prescribed them was already in the 10,000IU range so they were taking about 100,000IU daily for several weeks and the patient developed diarrhea. When he stopped that resident, within several days diarrhea stopped ...Read moreSee 2 more doctor answers
Possible causes: You could have a low b-12 if you are vegetarian, have been for several years and don't take supplemental b-12. It could be low if you don't make intrinsic factor. This is made in the stomach and is needed to absorb b-12. Lack of intrinsic factor is usually an autoimmune disorder. You could have low b-12 due to taking proton pump inhibitors for a long time as stomach acid is needed as well. ...Read moreSee 1 more doctor answer
Needs evaluation: B12 is not toxic so high B12 due to taking it is not bad. If someone has high B12 without taking it then it can be a sign of serious problems including liver ; kidney disease, myelproliferative disorders including leukemia ; polycythemia vera ; hypereosinophilic syndrome. High B12 does not cause these but caused by them. Further tests are needed to find the underlying cause: http://bit.Ly/1hvpcy7. ...Read moreSee 1 more doctor answer
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