B vitamins reduce stroke risk
Doctors said earlier studies of B vitamins and cardiovascular diseases have been inconclusive. In this review, researchers evaluated 19 B-vitamin studies covering 47,921 men and women. The studies gave participants various doses of folic acid, with or without vitamins B6 and B12, and lasted anywhere from six months to seven years.

Overall, doctors found that B vitamins reduced the chances for any kind of stroke by 12 percent. In explaining their positive findings on stroke, but no findings for other circulatory diseases, doctors said that most prior studies gave B vitamins after the appearance of disease, and that one should not expect a benefit from taking a supplement for a short period of time in an attempt to reverse a disease that has been developing for a long period of time.  

Reference:  Clinical Nutrition; 2012 Aug; Vol. 31, No. 4, 448-54

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