intrinsic factor is needed to absorb vitamin _____
Intrinsic factor is a glycoprotein released by parietal cells that line the internal surface of your stomach. Without intrinsic factor, your body can only absorb about 1 percent of the B-12 you ingest. With the help of intrinsic factor, this amount increases to 56 percent of a 1 microgram dosage of B-12. However, Intrinsic factor has its limits.