B vitamins and prevention of cognitive decline and incident dementia: a systematic review and meta-analysis

Elevation of homocysteine (Hcy) levels is well-established as a risk factor for dementia, yet controversy exists regarding whether B-vitamin-mediated reduction of homocysteine levels can benefit cognitive function.To investigate whether B vitamin supplementation can reduce the risk of cognitive decline and incident dementia.The PubMed, EMBASE, Cochrane Library, and Web of Science were systematically searched for articles published from the...