Letter: Ascorbic acid and vitamin B12 deficiency.
D001205:Ascorbic Acid / Q000008:administration & dosage / Q000009:adverse effects*; D006801:Humans; D008875:Middle Aged; D014805:Vitamin B 12 / Q000097:blood; D014806:Vitamin B 12 Deficiency / Q000139:chemically induced*
D014805:Vitamin B 12; D001205:Ascorbic Acid