Public interest in vitamin B12 has skyrocketed in the past few years. As more information emerges about the dangers of B12 deficiencies, physicians and scientists propose concentrated doses of vitamin B12 as a remedy. These doses are available either in pill form or as injectable shots. Some gurus herald B12 shots as cure-alls, but there's more to know before you sit down for your first injection.
B12 shots are usually made of cyanocobalamin, a synthetic form of the vitamin. Some B12 shots may also contain hydroxocobalamin, another synthetic form. Both types are inactive, meaning the body must convert the injection into another form to make use of it. There are a few shots on the market that contain methylcobalamin or adenosylcobalamin, the active and natural forms of B12, but these really only work when taken or created together. In addition, there isn't much evidence of their effectiveness in a supplement or injectable form.
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