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There is also recent data which suggest that genetic alterations of the receptor by which B12 is transported into nerve tissue and the brain, may lead to a lower B12 uptake

[56] [57] Low levels of serum vitamin B 12 may be caused by other factors than B 12 deficiency, such as folate deficiency, pregnancy, oral contraceptive use, haptocorrin deficiency, and myeloma

Giving yourself B12 injections at home is easier and more convenient than having your doctor do it every time, but doing the first injection can be a little unnerving for most folks

You'll want to consider the overall value and how it fits into your budget