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However, if symptoms persist, it's important to consult a doctor

Some conditions that can cause this vitamin B12 deficiency include: Atrophic gastritis, an inflammation of the stomach Surgical removal of part of the stomach or intestines Conditions that affect your intestine's ability to absorb nutrients, such as Celiac disease Pancreatic insufficiency Alcoholism Acquired immune deficiency syndrome (AIDS) Some people who don't have enough of a protein called the "intrinsic factor" also have a vitamin B12 deficiency

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ICH Q2(R2): Validation of Analytical Procedures

They are two different classes of molecule with two different mechanisms and two different evidence trails, one of which happens to include a body of human physiological data the other simply doesnt have, owing entirely to the fact that one of them is something the body already makes