says Meir Stampfer, MD, DrPH. According to a large study, supplements of the B vitamin decrease incidence of a first stroke in people with high blood pressure by 21%. People with normal blood pressure are likely to benefit, too.

A standard daily multivitamin should provide adequate folic acid.

Better: Getting the vitamin from food, especially broccoli, beans (cooked from dried) and dark, leafy greens.

Also, enriched grain products

Source: Meir Stampfer, MD, DrPH, is professor of Medicine at Harvard Medical School, Boston, and coauthor of an editorial published in JAMA Bottom Line Personal June 2015