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You can have vitamin B12 deficiency anemia if you don't get enough vitamin B12 in your diet from foods like milk, eggs, and meat, or if your body can't absorb B12 because of a health problem

Treat these as warning signs that a source is not legitimate: no prescription required, a pharmacy located outside the United States, packaging that is damaged, opened, unlabeled in English, or missing an expiration date, and ingredient lists described only as proprietary blends

2009;60 Suppl 7:191196

Vitamin B12 is essential to the creation and regeneration of red blood cells, also known as hemoglobin, which transport oxygen and nutrients throughout your body to other cells