is B12 produced in stomach
Pernicious anemia occurs in the stomach. Intrinsic factor is one such protein that your body needs, both to extract cobalamin (vitamin B12) from food and to utilize it efficiently so that it reaches your blood stream.hatâs because unlike other vitamins, B12 cannot be absorbed from foods without the help of certain digestive enzymes that are produced by your parietal cells of the stomach. Gastritis (stomach inflammation) is one of several causes of vitamin B12 malabsorption.