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How safe are folic acid supplements?

N R Campbell1

  • 1Department of Medicine, Faculty of Medicine, University of Calgary, Alberta.

Archives of Internal Medicine
|August 12, 1996
PubMed
Summary
This summary is machine-generated.

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Folic acid supplementation effectively prevents neural tube defects but may mask cobalamin deficiency, particularly in strict vegetarians. Physicians should monitor for adverse effects despite weak evidence of harm.

Area of Science:

  • Nutritional Science
  • Public Health
  • Medical Research

Background:

  • Periconceptual folic acid (FA) is crucial for preventing fetal neural tube defects (NTDs).
  • Potential benefits extend to reducing atherosclerosis and certain cancers.
  • Safety concerns have limited widespread recommendations for increased FA intake.

Purpose of the Study:

  • To evaluate the safety of folic acid supplementation.
  • To identify potential adverse effects and risks associated with increased FA consumption.
  • To inform clinical practice regarding FA use and monitoring.

Main Methods:

  • Review of existing data, including case series and reports, on FA supplementation safety.
  • Analysis of potential interactions and adverse effects.

Related Experiment Videos

  • Assessment of diagnostic challenges related to cobalamin deficiency.

    • Main Results:

    • Evidence suggesting FA unsafety is predominantly based on weak data.
    • A significant risk is the masking of hematologic abnormalities in cobalamin deficiency.
    • Strict vegetarians are identified as a high-risk group for cobalamin deficiency.

    Conclusions:

    • While FA is effective for NTD prevention, vigilance for adverse effects is necessary.
    • Physicians must be aware of the low sensitivity of routine hematologic indexes for cobalamin deficiency in FA-supplemented patients.
    • Further high-quality data are needed to definitively exclude specific adverse effects of increased FA consumption.