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Old 06-01-2007, 03:18 PM
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Default Folic Acid Supplements Cut Stroke Risk

Folic acid supplementation may reduce the risk of stroke by 18 percent or more, but it's not clear whether it boosts outcomes for other cardiovascular conditions, researchers say.
A study published last year in the journal Circulation found that there was a significant drop in stroke death rates in Canada and the United States after both countries mandated folic acid fortification of cereals and breads in 1998.
For the new research, a U.S. team reviewed eight studies of folic acid supplementation, which lowers concentrations of homocysteine in the blood. High homocysteine levels are believed to increase the risk of stroke, cardiovascular disease, and deep vein thrombosis.
Professor Xiaobin Wang, of Northwestern University Feinberg School of Medicine in Chicago, and colleagues found that folic acid supplementation reduced the risk of stroke by an average of 18 percent.
Even greater risk reduction were noted when treatment lasted more than 36 months (29 percent lower risk); when homocysteine levels were reduced by more than 20 percent (23 percent lower risk); or if a patient had no previous history of stroke (25 percent lower risk).
In regions that did not already have supplementation via fortified foods, the introduction of folic acid supplementation reduced stroke risk by 25 percent.
"Our meta-analysis provides coherent evidence that folic acid supplementation can reduce the risk of stroke in primary prevention," the study authors wrote.
The review appears in the June 2 issue of The Lancet medical journal.
"Although this meta-analysis helps clarify answers to some questions about the role of homocysteine lowering in CVD (cardiovascular disease) prevention, ongoing randomized trials are needed before we can conclude that the benefit of continued use of previously deemed 'safe' vitamin supplements outweighs the risk of other adverse CVD outcomes," Dr. Cynthia Carlsson, of the University of Wisconsin School of Medicine and Public Health, wrote in an accompanying comment article.
More information
The U.S. Centers for Disease Control and Prevention has more about folic acid.
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