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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
how they translate across routes is an open research question, not a solved one
The spray is fine if you want something easy, great for hangovers, focus needed instantly but if you actually want longer term results, injections or IV are worth it
What laboratory tests are used to monitor the effectiveness of B12 injection therapy
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