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The bottom line A high serum vitamin B12 is usually explained by something the patient took or was given
Injection-site reactions (mild redness, irritation) may occur
They're made to meet a person's specific needs or to fulfill demand in the event of a shortage
Other causes include strict vegan diets, malabsorption disorders (coeliac disease, Crohn's disease), gastrointestinal surgery, and long-term use of medications such as metformin or proton pump inhibitors
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