False regarding physiology of cobalamin absorption and metabolism
Cobalamin undergoes enterohepatic circulation in humans After cobalamin-intrinsic factor complex enters the ileal cell, cobalamin appears in portal circulation after a delay of about 6 hours. Absorption of cobalamin occurs by active process in ileum only Adocobalamin is cofactor for methylmalonyl coA mutase and methylcobalamin is a co factor for methionine synthase