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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Vit B 12 is absorbed in
assistant
The correct answer is  The  cobalamin-lF complex travels through the gut. The complex binds to specific receptors on the surface of the mucosal cells of the ileum. The binding of the complex and entry of B12 into the mucosal cells is mediated by Ca2+ ions. In the  mucosal  cells,  B12  is  converted  to methyf cobalamin. lt is then transported in the circulation in  a  bound form to  proteins namely  transcobalamins.