I used to be anemic but after the gyno surgery I am ok now. I suffer from chronic gastritis. I am not aware this effects my B12 levels. They have not been abnormal in any of my blood tests.
Recently I have added a B12 supplement as it helps with stocking/glove neuropathy pain (pins and needles, burning sensation in your hands and feet) Hope this has helped, take care. ☺

I am deficient in both iron and B-12 it require me to take 325 mg ferrous sulfate a day and get B-12 injections monthly mine is from stomach surgery and a bowel resection.

I have issues with my B12 levels as well. I have to take supplements to keep it at a normal level.