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Because the vitamin is injected directly into the bloodstream, patients often feel results within hours to a few days

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Conditions that may lead to anemia include: Heavy periods Pregnancy Ulcers Colon polyps or colon cancer Inherited disorders A diet that does not have enough iron, folic acid or vitamin B12 Blood disorders such as sickle cell anemia and thalassemia, or cancer Aplastic anemia, a condition that can be inherited or acquired G6PD deficiency, a metabolic disorder Anemia can make you feel tired, cold, dizzy, and irritable

Malabsorption of vitamin B12, resulting from structural or functional damage to the stomach, where intrinsic factor is secreted or to the ileum, where intrinsic factor facilitates vitamin B12 absorption