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Ng F.M., Sun J., Sharma L., et al
People who have a rare blood disorder (polycythemia vera) may infrequently have symptoms related to this disorder while taking cyanocobalamin
notes that a significant number of people who are B12 deficient are unable to absorb the vitamin from food or supplements, and so need to inject it, which they can only do at their GP practice
Have a friend or family member present
A confirmed, untreated B12 deficiency can contribute to nerve symptoms and anemia over time, and for older adults the balance problems that severe deficiency can cause may raise the risk of falls
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