Oral consumption of donkey-hide gelatin is ineffective for iron deficiency anemia. Iron deficiency anemia requires iron supplementation treatment, but while donkey-hide gelatin is rich in collagen, it is not rich in iron, thus it is ineffective for treating iron deficiency anemia through oral consumption. For iron deficiency anemia, a diet rich in iron, such as animal liver, lean meats, and blood products, which are rich in iron, should be pursued. Additionally, it is necessary to avoid strong tea, as it contains tannins that can chelate iron and affect its absorption.