B-vitamins 'no help to brain'
Taking B-vitamins to stave off mental decline and Alzheimer's is likely to be a waste of time.
Scientists said people would be better off eating more fruit and vegetables as part of a balanced diet. This is despite earlier evidence suggesting that B-vitamins protect the brain.
Vitamins B9 and B12 are known to reduce blood levels of a compound that has been linked to Alzheimer's.