vitamin b12 injection how often Can You Get a Shot for Maximum Health? B12 Shots Dosage for Adults:
Description
Patients who have had their band removed or adjusted, or who have experienced significant weight regain, may have altered nutritional needs and should seek reassessment from their bariatric team

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The exact pathogenically mechanism is not well known

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Malabsorption from coeliac disease, Crohns, gastric surgery or long-term metformin and proton-pump inhibitors accounts for much of the rest

The large amount doesn't pose a danger because people with pernicious anemia absorb only a small fraction of it
