what is vitamin b12 injection given for Injections: You Need To Know Vitamin B12 Injections: Benefits and
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Its effects come on relatively quickly and, if administration is stopped, it clears the system rapidly

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In fact, people who have B12 deficiency are at higher risk of megaloblastic anemia, which essentially means the body does not have the ability to make enough red blood cells to carry oxygen through the body and leads to chronic fatigue