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Other common symptoms of B12 deficiency include: Lethargy or a total lack of energy Extreme fatigue Palpitations Pale skin Feeling faint Breathlessness Weight loss and loss of appetite Your doctor may prescribe B12 injections in extreme cases that take effect right away
Thats partly so that humans are not put at risk, but its also because research on animals is much less expensive to do
Benefits, where present, require continued administration nothing about the injection produces a lasting metabolic change once it stops
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BMC cardiovascular disorders
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