Does Vitamin B improve Alzheimer's?

There information out there about the effect of taking Vitamin B to improve Alzheimer's.

According to medpage Today in an article by By John Gever, Staff Writer, MedPage Today and reviewed by Robert Jasmer, MD; Associate Clinical Professor of Medicine, University of California, San Francisco
Published: October 14, 2008, Alzheimer's Disease Not Susceptible to B Vitamins and according to an article on WebMD
Alzheimer's Patients Decline Despite High-Dose Folate, Vitamin B6/B12
By Daniel J. DeNoon
WebMD Health NewsReviewed by Louise Chang, MD
And according to an article WBZ news A new study released Tuesday finds that taking mega-doses of B vitamins does not appear to slow the progression of Alzheimer's disease. However, Boston area researchers are testing some promising new compounds which may do just that.

A trial at Neurocare Center for Research in Newton is testing an experimental antibody which attacks proteins linked to Alzheimer's
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What do you think?