Agewise variation of vitamin B12 serum levels.
D000375:Aging / Q000502:physiology*; D001769:Blood; D006801:Humans; D014805:Vitamin B 12 / Q000097:blood*; D014803:Vitamin B Complex
D014803:Vitamin B Complex; D014805:Vitamin B 12
AGING/physiology; BLOOD; VITAMIN B12/in blood