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Pernicious Anemia: Definition, Symptoms, Causes & Treatment How Often Can I Take B12 Injections? Vitamin B12 and Heart Palpitations Explained Qaly Feeling worse after B12 Injections Pernicious Anaemia S Vitamin B12 Deficiency: Vitamin B12 deficiency is a nutritional or absorption related disorder leading to impaired DNA synthesis and neurologic dysfunction, commonly presenting with megaloblastic anemia and neuropsychiatric symptoms. Physiological Vitamin B12 deficiency symptoms and testing
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