Three Bs for the brain.
D000368:Aged; D003704:Dementia / Q000209:etiology; D005492:Folic Acid / Q000097:blood*; D006710:Homocysteine / Q000097:blood; D006801:Humans; D008297:Male; D013850:Thinking / Q000187:drug effects / Q000502:physiology*; D014805:Vitamin B 12 / Q000097:blood*; D025101:Vitamin B 6 / Q000097:blood*
D006710:Homocysteine; D025101:Vitamin B 6; D005492:Folic Acid; D014805:Vitamin B 12