Promotes absorption of the essential vitamin cobalamin (Cbl) in the ileum. After interaction with CUBN, the CBLIF-cobalamin complex is internalized via receptor-mediated endocytosis. Interacts with CUBN (via CUB domains). Gastric mucosa. The disease is caused by variants affecting the gene represented in this entry. Belongs to the eukaryotic cobalamin transport proteins family. Intrinsic factor entry