This usually goes away in a day or two
However, there are certain conditions in which vitamin B12 cannot be absorbed, for example, due to dietary insufficiency, malabsorption, or lack of intrinsic factor, hepatic stores are depleted, and deficiency ensues
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B12 injections for metabolism help your system function better, which may support digestion and calorie burn
Macrocytic anemia occurs when your body doesnt have enough normal red blood cells, and can cause symptoms including muscle weakness and paresthesias (paresthesias is the technical term for the pins and needles feeling on your skin)
Research suggests that the abdomen may be the least painful place for a subcutaneous injection, but this may vary for each individual