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This can last for one to two weeks, depending on the individuals response and medical guidance
And because anywhere from 1 to 5 mg can be stored, a deficiency that develops from inadequate intake or absorption can take months to years to develop 4
A full blood count and serum B12 measurement are straightforward investigations that can help differentiate causes
Risk factors for B12 deficiency include strict vegetarian diets, gastrointestinal conditions, and certain medications
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