Vitamin B does not slow the progression of Alzheimer's disease, new research suggests.
High doses of the vitamin did not slow the rate of cognitive decline in individuals with mild to moderate forms of the condition, according to the study published in the Journal of the American Medical Association.
The study was carried out because vitamin B is known to have an effect on an amino acid called homocysteine, which is involved in neurological disease.
Lead researcher Paul Aisen, professor of neurosciences at the University of California, San Diego School of Medicine, said that previous studies investigating the same subject had not either been large enough or of long enough duration to properly assess the effects.
He continued: "This study of several hundred individuals over the course of 18 months showed no impact on cognition, although it resulted in lower levels of homocysteine in these patients."
Meanwhile, a separate study conducted by scientists at Emory University School of Medicine has suggested an apparent link between low vitamin D levels and an increased risk of Parkinson's disease.
More than half of Parkinson's patients in the study were found to have insufficient levels of the vitamin.
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