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For those deficient in B12, one shot may provide symptom relief for 5-7 days on average before you start feeling fatigued or off again
Rarely, people might have allergic reactions like hives or swelling
To date, management of vitamin B12 deficiency with vitamin B12 injections is currently well established, but new routes of vitamin B12 administration, particularly oral and nasal, are being studied [3,4]
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