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A: The primary factor is usually the specific research objective and the model being used
O'Neill DG, Church DB, McGreevy PD, Thomson PC, Brodbelt DC
However, despite the small amount needed, the effects of a deficiency can be devastating
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
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