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Updated: Jun 12, 2026

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The homocysteine controversy.

Yvo M Smulders1, Henk J Blom

  • 1Internal Medicine and Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands. y.smulders@vumc.nl

Journal of Inherited Metabolic Disease
|June 23, 2010
PubMed
Summary
This summary is machine-generated.

Mild hyperhomocysteinemia predicts cardiovascular disease, but B vitamin trials show no benefit. This review explores the homocysteine controversy, examining limitations in studies and potential adverse effects of B vitamins on atherosclerosis.

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Area of Science:

  • Cardiovascular Disease Research
  • Nutritional Science
  • Biochemistry

Background:

  • Mild to moderate hyperhomocysteinemia is a recognized cardiovascular disease (CVD) predictor, independent of traditional risk factors.
  • Recent large intervention trials with B vitamins have failed to demonstrate benefits for homocysteine-lowering therapy in high-risk individuals.
  • Mendelian randomization studies have not conclusively linked common genetic variations affecting homocysteine levels to CVD risk, fueling the homocysteine controversy.

Purpose of the Study:

  • To address the ongoing controversy surrounding the role of homocysteine in cardiovascular disease pathogenesis.
  • To critically evaluate the limitations of existing Mendelian randomization analyses and intervention trials.
  • To explore potential explanations for the discrepancy between homocysteine's predictive role and the lack of therapeutic benefit from its reduction.

Main Methods:

  • Review and critical analysis of Mendelian randomization study methodologies and their inherent limitations.
  • Examination of the design, execution, and generalizability of large-scale B vitamin intervention trials.
  • Exploration of potential mechanisms by which B vitamins, particularly high-dose folic acid, might exert adverse effects on atherosclerotic lesions.

Main Results:

  • Mendelian randomization analyses possess limitations that prevent definitive conclusions regarding homocysteine's causal role in CVD.
  • Characteristics of intervention trials, such as specific patient populations and trial durations, limit the interpretation and broad applicability of their findings.
  • The possibility of beneficial homocysteine lowering being negated by adverse B-vitamin side effects on atherosclerosis warrants serious consideration.

Conclusions:

  • The homocysteine hypothesis of CVD remains controversial due to methodological limitations in research.
  • Adverse effects of B-vitamin regimens, including high-dose folic acid, on atherosclerosis progression may offset potential benefits of homocysteine reduction.
  • Further research is needed to elucidate the complex interplay between homocysteine, B vitamins, and cardiovascular health, considering potential pro-inflammatory or pro-proliferative effects.