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Injection A person with a severe vitamin B12 deficiency or difficulty absorbing vitamin B12 may require an injection of vitamin B12, which some people refer to as a B12 shot
B-12 (cobalamin): Cobalamin or cyanocobalamin is usually just called vitamin B12 when sold as a supplement or listed as an ingredient
In general, though, these injections last about a week or two
For example, people who maintain a vegetarian or vegan diet, people with absorption disorders, and those taking prescription meds like Metformin, Proton Pump Inhibitors (PPIs), and H2 blockers like Pepcid are often at greater risk
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