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For intramuscular injections, 22-25 gauge is preferred, while for subcutaneous injections, 25-27 gauge is suitable

A 2020 study found that those with vitamin B12 deficiency may present with cognitive disorder, though the deficiency was not shown to be a direct risk factor for cognitive decline ( However, results have been mixed and treatment with vitamin B12 wasnt effective at improving brain function in people with normal brain function ( Depression Its been suggested that there may be a link between low vitamin B12 levels and depression

Serious B12 deficiency may cause anemia and nerve damage

Does vitamin B12 injection dosage vary based on deficiency levels