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Vitamin B12 is an essential nutrient that plays a vital role in many bodily functions, including red blood cell formation, nerve function, and DNA synthesis

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Within 5 to 8 days after the dose, the infants experienced significantly increased hemoglobin and reticulocyte counts, normoblastic erythropoiesis, improved mental status, regression of abnormal skin pigmentation, and reduction in tremors.[9] Three hundred sixty-six pregnant women in India received 50 mcg of oral vitamin B 12 or placebo capsules once daily beginning during their first trimester of pregnancy and continuing until 6 weeks postpartum

Among these illnesses are Alzheimers, multiple sclerosis, Bells palsy, neuropathies, Crohns, even autism