The B. vitamins and Alzheimer’s disease
high doses of vitamin B can reduce brain shrinkage by as much as 50% and delay the onset of Alzheimer’s. High levels of amino acid homocysteine are linked to Alzheimer’s, and the Vitamin Bs reduce these levels And reduce the risk of Alzheimer’s by 50%
The brain shrinks about a half a percent each year. 16% of people by the age of 70 have mild cognitive impairment and half of them will get Alzheimer’s. subjects were given 300 times the recommended daily intake of vitamin B 12 (0.5mg). four times the recommended dose of folic acid (0.8 mg, and 15 times the recommended dose of vitamin B6 (20 mg). With these doses, this study was a drug intervention not a vitamin intervention.
source, David Smith, University of Oxford study.