When you have stomach surgery, could affect the stomach lining which process esB12, and folic
acid related. I was lucky, it was folic
acid. But, my doctor told me hemotologist prescribed folic acid, and he didn't understand why, so I called hemotologist, and he was furious, and told me to report any student at clinic that didn't check and understand, he gave me word for it, macrocystic anemia, or megaloblastic anaemia.