Vitamin B12 deficiency causes reversible megaloblastic anemia, demyelinating disease, or both. Current assays have insufficient sensitivity and specificity; methylmalonic acid levels are useful to confirm diagnosis. Parenteral or high-dose oral vitamin B12 is effective therapy.
It doesn't help when doctors with god complex syndrome think they know better than those they are treating. That's iodine and B12 deficiency i have found that are making people sick. 2 easy to reverse causes. But oh no, lets keep making people suffer. Why should i waste my time sifting out "shitty" research when health care *cough* SICK care is based on it.