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What is a vitamin B12 injection?

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Quick Answer

A Vitamin B-12 injection is used to treat a variety of conditions that result from a deficiency of vitamin B-12, according to MedlinePlus. An injection can be used proactively to counteract the deficiency of vitamin B-12 due to various illnesses, infections or medications.

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Full Answer

The body absorbs vitamin B-12 from food, and the injections serve to supplement the levels of the vitamin that cannot be absorbed from food due to certain ailments, as MedlinePlus states. Vitamin B-12 is also important for preventing anemia and the resulting permanent nerve damage. Vitamin B-12 shots have also been used for weight loss because they boost energy and metabolism, but as Mayo Clinic points out, these effects only occur if there is already a deficiency of vitamin B-12 in a person's body.

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