TY - JOUR T1 - HIgh-dose b vitamin supplements and alzheimer disease AU - Machanic BI Y1 - 2009/03/11 N1 - 10.1001/jama.2009.212 JO - JAMA SP - 1020 EP - 1022 VL - 301 IS - 10 N2 - Prior studies have shown a relationship between low cerebrospinal fluid folate levels in patients with AD compared with normal controls. Low levels of L-methyl folate and methyl B12 have correlated with increased risk of cognitive impairment.2 It is possible that the patients in the study by Aisen et al were too advanced beyond a potential time window for benefit from B vitamin intervention to see a beneficial result. SN - 0098-7484 M3 - doi: 10.1001/jama.2009.212 UR - http://dx.doi.org/10.1001/jama.2009.212 ER -