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What Is the Function of B12 in the Body?

Vitamin B12, a vital nutrient in the body, is used to make blood cells and plays a vital role in maintaining a healthy nervous system.

  1. How to Consume B12

    • Normal consumption of meat, dairy, shellfish and eggs can aid in the natural production of vitamin B12 in the body according to WebMD. This increases the natural amount of B12 in the body, leading to better body responses with cognitive and nervous functions.

    B12 Deficiency

    • A deficiency of vitamin B12 can occur with people who are vegetarians who avoid B12-rich foods, or when a person is unable to absorb B12 naturally, caused by an autoimmune disorder known as pernicious anemia. Signs of deficiency include fatigue, weakness, constipation and tingling of the hands and feet.

    B12 Supplements

    • B12 can be found in supplemental form through vitamins, tablets or lozenges. For more serious deficiencies, intramuscular injections of vitamin B12 shots can be prescribed by a physician to restore B12's natural function in the body. A gel form of B12 is available through prescription, as well.

    Vitamin B12 Fads

    • Vitamin B12 shots have been touted by celebrities and some weight loss physicians to increase energy and help lose weight. Although little evidence exists to support this, many testimonials still appear to back up these notions. According to the National Institutes of Health's Office of Dietary Supplements, B12 shots are helpful only in the case of deficiency.

    Warnings

    • B12 can interact with certain medications, including chloramphenicol, proton pump inhibitors, H2 receptor antagonists (such as Tagamet® and Pepcid®) and metformin, according to the NIH's Office of Dietary Supplements. Any medication taken should be discussed with a physician.

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