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How long does the B12 injection take

Contraindications Vitamin B12 injection is contraindicated in pregnant and lactating women, liver disease, kidney disease, infection, iron deficiency, folic acid deficiency, the patient undergoing treatment that has a direct effect on bone marrow, an allergy to medication, vitamin, preservative or cobalt

That's a rule payers enforce through NCCI edits

According to the Vitamin B12 is present in a range of foods, including: eggs poultry fish meat milk and other dairy products beef liver clams some fortified breakfast cereals and nutritional yeasts Dietary supplements are also available for those who do not consume enough vitamin B12 as part of their diet