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Pernicious anaemia is caused by a deficiency in vitamin B12, due to atrophic gastritis, an autoimmune condition (immune system destroys self), in this case the parietal cells of the stomach that produce intrinsic factor, a glycoprotein that binds to vitamin B12 in the stomach and is essential for normal absorption of vitamin B12 in the small intestine into the blood

//// Nevertheless there is no medical evidence that injections of vitamin B12 promote health in anyone other than those who are suffering from a B12 deficiency

These checkpoints frame the most common evaluation moments

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