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A B12 injection may be worth discussing if: You have absorption problems: Conditions like Crohn's disease, celiac disease, or atrophic gastritis can reduce how well your body absorbs B12 from food, and past gastric surgery can have a similar effect
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[17] Physiologic B12 requirements increase during gestation, and parenteral cyanocobalamin is considered appropriate when dietary intake or intestinal absorption is inadequate
Egras AM, Hamilton WR, Lenz TL, Monaghan MS
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