A substance called homocysteine is known to be involved in neurological diseases, including Alzheimer's. Vitamin B is known to reduce levels of homocysteine in the body so some scientists wonder whether vitamin B supplements might help to stave off the condition. A study of 340 people by scientists from the Alzheimer's Disease Cooperative Study compared those participants taking a high-dose vitamin B supplement and those taking a placebo. Unfortunately the study found no differences in cognitive performance between the two groups and those taking the vitamin supplement were more likely to show symptoms of depression.
You can find out more about this research at
http://psychcentral.com/news/2008/10/16/vitamin-b-does-not-help-alzheimers/3146.html
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