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When deficiency is suspected based on clinical features (fatigue, paraesthesia, cognitive changes) or risk factors (vegan diet, gastric surgery, certain medications), serum B12 measurement guides appropriate intervention
Over weeks two through four, your bone marrow produces new, healthy, normal-sized cells, which can improve endurance, restore a healthier skin tone, and reduce symptoms like heart palpitations tied to anemia
Given by intravenous or intramuscular injection, it restores B12 status quickly and is taken up and used directly without the metabolic conversion that cyanocobalamin requires
References Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes
