The C.A.M. Report
Complementary and Alternative Medicine: Fair, Balanced, and to the Point
  • About this web log

    This blog ran from 2006 to 2016 and was intended as an objective and dispassionate source of information on the latest CAM research. Since my background is in pharmacy and allopathic medicine, I view all CAM as advancing through the development pipeline to eventually become integrated into mainstream medical practice. Some will succeed while others fail. But all are treated fairly here.

  • About the author

    John Russo, Jr., PharmD, is president of The MedCom Resource, Inc. Previously, he was senior vice president of medical communications at, a complementary and alternative medicine website.

  • Common sense considerations

    The material on this weblog is for informational purposes. It is not medical advice or counsel. Be smart, consult your health professional before using CAM.

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    Prevalence of vitamin B-12 deficiency

     Since fortification of flour with folic acid started 10 years ago in the US, efforts have been taken to fortifying flour with vitamin B-12.

    So, how prevalent is B-12 deficiency?

    • In the US and UK, about 6% of those older than 59 years are vitamin B-12 deficient (vitamin B-12 blood levels less 148 pmol/L).
    • The prevalence of B-12 deficiency increases with age.
    • Close to 20% have marginal status (vitamin B-12 blood levels between 148–221 pmol/L) in later life.
    • In developing countries, a B-12 deficiency is more common — starting in early life and persisting throughout life.

    The bottom line?
    Inadequate intake, due to low consumption of animal-source foods, is the main cause of low vitamin B-12 blood levels in younger adults and probably the main cause among the poor, worldwide.

    In older persons, food-bound cobalamin malabsorption becomes the predominant cause of deficiency, at least in part due to gastric atrophy, but it is likely that most elderly can absorb the vitamin from fortified food.

    Fortification of flour with vitamin B-12 is likely to improve the status of most persons with low stores of this vitamin.

    What isn’t known is the effect of B-12-fortified floor on neural tube defect pregnancies, as was the case with folic acid, the practical effect of B-12-fortified flour on elderly individuals with a B-12 deficiency, and its potential side effects (macrocytic anemia and neurological complications).

    The American Journal of Clinical Nutrition has published a supplement on this topic.
    1/19/09 19:57 JR

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