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Summary: Vitamin B12 treatment typically begins producing early haematological responses within 34 days, with neurological symptoms starting to improve within 12 weeks, though complete symptom resolution may require several weeks to months depending on deficiency severity and treatment route
Those with Crohns disease, celiac disease, or other malabsorption disorders, which often hinder the bodys ability to absorb nutrients, might find B12 injections advantageous
