Impairment of folic acid absorption by oral pancreatic extracts.

Higher serum folate levels were found among newly diagnosed, untreated patients with pancreatic insufficiency than among treated patients despite greater fat malabsorption in the former group. In vivo folate absorption tests using Tritium-labeled pteroylmonoglutamatic acid showed folate absorption to be enhanced in pancreatic insufficiency patients as compared to control subjects (P less than 0.01). Moreover, pancreatic extract significantly inhibited folate absorption in both normal subjects (P less than 0.05) and pancreatic insufficient patients (P less than 0.001). In vitro testing showed pancreatic extract to form insoluble complexes with folate. Such complex formation may diminish absorption of dietary folate and lead to folate deficiency. Since both pancreatic extract and bicarbonate are used in the treatment of pancreatic insufficiency and both are known to impair folate absorption, folate status should be monitored in patients being treated for pancreatic insufficiency; supplementation may be indicated.