Walker said it's not clear yet how adding vitamins might work to boost brain functioning, and not all studies have agreed upon their benefits.
One idea is that the vitamins reduce the body's levels of a molecule called homocysteine, which is linked to cardiovascular disease and poor cognitive function.
The body uses homocysteine to build proteins, but high levels of it in the blood are associated with heart disease -- and heart disease is linked to mental decline.
The thinking goes that lowering homocysteine could perhaps reduce someone's cardiovascular risk, and in turn affect his mental functioning.
A recent test of folic acid's influence on cardiovascular disease, however, found that in people with high homocysteine levels, the vitamin didn't help prevent thickening of the arteries.
Walker said it will be important to test whether other groups of people, especially those older than the people who participated in this study, could also benefit from taking the supplements.
These energy vitamins will help others and you.
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