Large doses of vitamin B could help to slow the rate of mental decline associated with dementia.
Recent clinical trials conducted in England revealed that elderly people with memory problems could see their rate of brain shrinkage halved by taking the substances.
Vitamins B-6 and B-12 as well as folic acid were found to be particularly effective at reducing the rate of decline in patients with mild cognitive impairment.
Dr Gustavo Roman, medical director at the Alzheimer's and Dementia Centre at the Methodist Neurological Institute in Houston, commented on the study: "I'm not saying that everyone who takes B vitamins will prevent dementia.
"But in the right dosage and for the appropriate patients, the vitamin B-12 treatment could be a step toward modifying disease progression."
The doctor noted that people who are already experiencing symptoms of the mental health condition were more likely to respond positively to the vitamin treatment.