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Policy Vitamin B12 deficiency, sometimes called cobalamin deficiency, happens when your body is either not getting enough or not absorbing enough vitamin B12 from the foods you eat
Learn where to self-administer a B12 shot and how to do it painlessly This article was medically reviewed by Shari Forschen, NP, MA and by wikiHow staff writer, Amber Crain
Some people need a short course close together, while others may only need occasional top-ups for maintenance
Can digestive conditions contribute to deficiency risk
Taking birth control, antacids, or chronic medications that interfere with absorption
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