how quickly does b12 injection work Fast a Vitamin Shot Work? how long before vitamin b12

Vitamin B12 is water-soluble it quickly dissolves in water and does not remain in the body, being eliminated through urine within 2472 hours depending on physical activity and water intake

For example, people with pernicious anemia might need different doses because they cant make the right proteins

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Neurological symptoms associated with B12 deficiencysuch as paraesthesia, ataxia, or cognitive impairmentrequire urgent treatment with more frequent injections (1mg on alternate days initially) to prevent irreversible nerve damage

Separate-vial protocols require separate math because injection count and vial coverage change

You use it once, and you discard the rest