What are the recommended dietary allowances (RDAs) for vitamin B-12 (cyanocobalamin)?

Updated: Dec 26, 2017
  • Author: Mark Rosenbloom, MD, MBA; Chief Editor: Michael A Miller, MD  more...
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Answer

Vitamin B-12 (ie, cyanocobalamin), which requires an intrinsic factor for absorption, is found in milk products, eggs, fish, poultry, and meat. Supplements usually contain 25-250 mcg of the vitamin per tablet. Vitamin B-12 is a treatment of pernicious anemia and cyanide poisoning.

The RDAs for vitamin B-12  are as follows [7] :

  • Age 0-6 months (adequate intake) - 0.4 mcg

  • Age 7-12 months (adequate intake) - 0.5 mcg

  • Age 1-3 years - 0.9 mcg

  • Age 4-8 years - 1.2 mcg

  • Age 9-13 years - 1.8 mcg

  • Age 14 years and older - 2.4 mcg

  • Pregnancy (14 y and older) - 2.6 mcg

  • Lactation (14 y and older) - 2.8 mcg


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