Hi. Vitamin B12 is a very important vitamin which is available only in non-vegetarian sources and is essential for red blood cell production
and maturation. Deficiency of this vitamin is common in vegans and would lead to anemia and less commonly nervous system abnormalities
. Iron is also important as is folic acid, and these three together are quint essential to prevent anemia. Anemia can result due to deficiency of any of these three substances, and any type of anemia is associated with fatigue/dizziness as the oxygen carrying capacity of blood reduces due to deficient hemoglobin
. Other causes of Vitamin B12 deficiency
include worms, absorption defects and pernicious anemia
. So do not hesitate in treating her with Vit.B12 if it is the cause based on the tests. THank you.