Alzheimers Not Significantly Helped By Vitamin B Supplementation

A new study in the October 15 issue of the Journal of the American Medical Association (JAMA; Chicago) shows that high-doses of vitamin B supplementation do little to reduce the speed of cognitive decline in Alzheimer patients.

Evidence of homocysteine (an amino acid produced by the body) elevation in Alzheimer disease (AD) and the involvement of homocysteine in neuropathological mechanisms suggest that reduction of homocysteine may offer an approach to altering the disease, according to the study.

According to the authors, prior studies of B vitamins to reduce homocysteine in AD have not had sufficient size or duration to assess their effect on cognitive decline.

Paul S. Aisen, M.D., of the University of California, San Diego, and colleagues conducted a clinical trial to determine if reduction of homocysteine levels with high-dose supplementation with folic acid and vitamins B6 and B12 for 18 months would slow the rate of cognitive decline in 409 individuals with mild to moderate AD.

Participants were randomly assigned to two groups of unequal size to increase enrollment (60 percent treated with high-dose supplements [5 mg/d of folate, 25 mg/d of vitamin B6, 1 mg/d of vitamin B12] and 40 percent treated with identical placebo). A total of 340 participants completed the trial while taking study medication. Cognitive abilities were measured via testing with the Alzheimer Disease Assessment Scale (ADAS-cog).

The researchers found that even though the vitamin supplement regimen was effective in reducing homocysteine levels, it had no beneficial effect on the primary cognitive measure: the rate of change in ADAS-cog score did not differ significantly between treatment groups. The authors did find that symptoms of depression were more common in the high-dose supplement group.

“Many studies suggest that relative elevation of homocysteine is characteristic of AD, and laboratory research implicates homocysteine in neurodegenerative mechanisms. High-dose B vitamin supplementation in individuals with normal levels of B vitamins was effective in reducing homocysteine levels. However, our study does not support the treatment of individuals with mild to moderate AD and normal vitamin levels with B vitamin supplements,” the authors concluded.

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Editorial: B Vitamins for Prevention of Cognitive Decline - Insufficient Evidence to Justify Treatment

In an accompanying editorial, Robert J. Clarke, M.D., F.R.C.P., and Derrick A. Bennett, Ph.D., of the University of Oxford, England, commented on the UCSD vitamin B findings:

“The precise reasons the [study by Aisen and colleagues] failed to detect any beneficial effect of B vitamins on the rate of cognitive decline remain unclear,” they write.

“However, until and unless new data suggest otherwise, there is insufficient evidence to justify routine use of homocysteine-lowering vitamin supplements for the prevention of Alzheimer disease and cognitive decline among individuals with normal vitamin status.”