Salmon is rich in vitamin B.
Salmon is rich in vitamin B. (rakratchada torsap/Free Digital Photos)

Taking vitamin B supplements may help reduce your risk of stroke, a new review shows.

Previous research has yielded conflicting findings about whether taking vitamin B supplements affects the risk of stroke and heart attack. Some studies have concluded that taking vitamin B supplements may actually increase the risk, according to the review authors.

They analyzed the findings of 14 clinical trials that included a total of nearly 55,000 people. All of the trials compared vitamin B supplement use with a placebo or very low-dose vitamin B.

The participants were followed for a minimum of six months. There were a total of nearly 2,500 strokes among the participants in the studies, all of which showed some benefit of taking vitamin B.

Overall, vitamin B supplements reduced the risk of stroke by 7 percent but did not appear to reduce the severity of strokes or the risk of death from stroke, according to the review, which was published in the Sept. 18 online issue of the journal Neurology.

The researchers found that folic acid, a supplemental form of folate (B-9) that is common in fortified cereals, appeared to reduce the beneficial effect of vitamin B. They also found that vitamin B-12 had no effect on stroke risk.

“Based on our results, the ability of vitamin B to reduce stroke risk may be influenced by a number of other factors, such as the body’s absorption rate, the amount of folic acid or vitamin B-12 concentration in the blood, and whether a person has kidney disease or high blood pressure,” review author Xu Yuming, of Zhengzhou University in China, said in a journal news release.

“Before you begin taking any supplements, you should always talk to your doctor,” Yuming added.

One expert agrees, noting that strokes can be caused by many varying factors.

“Ischemic strokes can have many different causes, the most common being hypertension, diabetes, high cholesterol, smoking and obesity,” says Dr. Rafael Alexander Ortiz, director of neuro-endovascular surgery and stroke at Lenox Hill Hospital in New York City.

“There is a group of patients that may suffer a stroke due to deficiency of vitamins and enzymes. It is appropriate to perform a comprehensive work-up, including [for] vitamin deficiencies, in patients that have suffered a stroke.”

Another expert says the findings are important.

“[The report] identifies a substance which is readily available and has been demonstrated to have a positive effect in stroke risk reduction in certain population subgroups,” says Dr. Albert Favate, director of the Comprehensive Stroke Center at NYU Langone Medical Center in New York City. “The article also reflects the increased public thirst for dietary prevention of stroke.”

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