Absorbing an adequate amount of vitamin B-12 (B-12), in a form which can be utilized by the body, is essential for optimal health. B-12 normally combines and forms a strong complex with a glycoprotein called Intrinsic Factor (IF) when it travels through the stomach. If there is inadequate B-12 intake, or inadequate IF produced by specialized cells of the stomach, a deficiency of the B-12 will result. B-12 not bound to Intrinsic Factor is highly susceptible to degradation by digestive enzymes as it travels through the intestine.