title: B vitamins may preserve memory.
mesh_terms: D000368:Aged; D053327:Apolipoprotein E4; D001057:Apolipoproteins E / Q000235:genetics; D006801:Humans; D008568:Memory / Q000502:physiology*; D014805:Vitamin B 12 / Q000097:blood*; D025101:Vitamin B 6 / Q000097:blood*
chemical_list: D053327:Apolipoprotein E4; D001057:Apolipoproteins E; D025101:Vitamin B 6; D014805:Vitamin B 12