Selective inhibition of vitamin B 12  absorption by para-aminosalicylic acid.
D000284:Administration, Oral; D000636:Aminosalicylic Acids / Q000009:adverse effects* / Q000494:pharmacology; D003036:Cobalt Isotopes; D006801:Humans; D007408:Intestinal Absorption / Q000187:drug effects; D008297:Male; D008875:Middle Aged; D014805:Vitamin B 12 / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000652:urine; D014806:Vitamin B 12 Deficiency / Q000139:chemically induced*
D000636:Aminosalicylic Acids; D003036:Cobalt Isotopes; D014805:Vitamin B 12