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Description
An untreated vitamin B12 deficiency can lead to neurological problems or pernicious anaemia, which occurs when your body doesn't have enough B12 to produce the amount of red blood cells it needs

First, tumors can affect the liver, which stores large amounts of B12

Below are some of the potential side effects you might experience from B12 shots: 1

Like any shot, you may feel a slight pinch, but the discomfort is minimal