A note about what the body does with iron during illness and this is quite relevant to discussions about anemia. First, let me mention that anemia of chronic disease (ACD) is the most common reason for anemia outside of blood loss. When infection is present in the body, iron is sequestered in the serum ferritin, so that it cannot be used by the infecting bacteria or viruses to grow. An example of this would be when after supplementing with iron, the iron stores in the body remain very low even though the ferritin may rise. The iron is actually being absorbed but the body is not allowing it to circulate freely, but instead produces more ferritin to hold the iron, keeping it unavailable to any invaders. So, in cases of ACD, supplementing with iron is fairly futile, as it won't be available to the body. The correct course is to find a cause of the ACD, rather than attacking the problem with iron, because if the iron is introduced, it can feed the infection. Also, because ACD can also be the result of some very serious illnesses like leukemia, it needs to be investigated fully.