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Tablets first, which gave me severe vomiting and diahorrea, then by injection which I then started to get better
In some cases, B-12 deficiency may reduce immunity (Patel, Cureus 2023
For example, someone with severe B12 deficiency and neurological symptoms might need more frequent injections at first
However, the primary use of B12 injections around the world, and the main reason people need it so badly, is because of a disorder called pernicious anemia
However, further research is necessary to confirm any link
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