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Common B12 deficiency symptoms include fatigue, anxiety, depression, poor memory, confusion, brain fog, tingling or numbness in the extremities, zings or zapping feelings in the extremities, anemia, shortness of breath, muscle weakness, irritability, tender calves, pale complexion and more

The choice depends on several factors, such as the injection dose, frequency, and medical equipment

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Vegetarians and vegans often face challenges in obtaining sufficient B12 from their diet, so supplementation becomes necessary

No research program is without constraints, and acknowledging these limitations helps set appropriate expectations

doi:10.1002/mas.21479