Vitamin B 12 plasma concentrations in Alzheimer disease. Stuerenburg H, Mueller-Thomsen T, Methner A. Comparative Study 2004; 25(3): 176-177 PubMed PMID: 15349081 Keywords: Alzheimer Disease:blood, Cognition:physiology, Humans, Nervous System:physiopathology, Reference Values, Vitamin B 12:blood,. Citation : In this contribution we investigated the correlation between plasma vitamin B12 levels and cognitive impairment in Alzheimer's disease. ..... Read abstract Full text PDF