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Here are some symptoms of vitamin B12 deficiency
That being said, it may cause severe side effects if an allergy is present or if the individual is also taking certain medications
Serious allergic reactions are uncommon but require urgent care
The Guidance from the British Society for Haematology caused a huge strain on this society resources as concerned patients, or rather frightened and terrified patients were being told by the GPs that following the advice of the BSH they have enough B-12 stored in their liver that they will not need an injection for a year or even longer
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