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Anaemia: Severe vitamin B12 deficiency can result in megaloblastic anaemia, which can cause fatigue, shortness of breath and pale skin
Factors That Affect How Long B12 Injections Last Several factors may influence how long the effects of a B12 injection last in your system, potentially explaining why some patients require more frequent injections than others, even with the same underlying condition
10.1016/S0306-4530(98)00032-8 79
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