Most Americans get plenty of vitamin B12 through the food they eat, but there are some notable exceptions (older Americans are particularly at risk, because they have less intrinsic factor ...

Initial symptoms of vitamin B12 deficiency, such as fatigue, nausea, and loss of appetite, are often basic and remain ...

Vitamin B12 deficiency can progressively get worse, eventually leading to dire health complications if not treated.

The diagnosis was not proved unequivocally in the majority of the cases fulfilling these criteria since other causes of vitamin B12 deficiency were not excluded and absence of intrinsic factor was ...

Subsequently he received injections of vitamin B 12 regularly until 1962 ... determined he had never received medication containing intrinsic factor. In the fall of 1965 he noted swelling of ...

One medical expert has underscored the impact of a lack of vitamin B12 on the body's ability to heal wounds. A significant protein called intrinsic factor (IF), which is produced in the stomach ...

A key protein called intrinsic factor (IF), produced by stomach cells, binds to vitamin B12. Without IF, vitamin B12 is lost during digestion. If the body's immune system attacks the stomach cells ...