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Chronic stress and alcohol abuse may also indirectly affect B12 levels

Pernicious anemia is associated with an increased incidence of carcinoma of the stomach, but this is believed to be related to the underlying pathology and not to treatment with cyanocobalamin

Part B: Medical Insurance B12 injections are primarily covered under Part B, provided the treatment is considered medically necessary and is administered by a qualified healthcare professional

When B12 runs low, symptoms tend to creep in slowly enough to get blamed on something else: persistent fatigue, brain fog, low mood, weight gain or difficulty losing weight, weakness, tingling in the hands or feet, shortness of breath, and a weakened immune system