The product is a glycoprotein produced by the parietal cells of the stomach that is necessary for the absorption of vitamin B12 (cobalamin) later on in the small intestine. When vitamin B12 is provided in combination with intrinsic factor, intrinsic factor reduces protease degradation and increases absorption of Vitamin B12. Niferex https://www.creativebiomart.net/therapeutic-proteins/p/72/glycoprotein-intrinsic-factor-if/