PROBLEM TO BE SOLVED: To provide an anemia therapeutic agent that is highly safe by means other than the administration of iron preparations, particularly an iron increasing agent that improves the anemia of athletes.SOLUTION: The present invention provides a blood iron increasing agent for high-load athletes comprising catechin as an active ingredient.SELECTED DRAWING: None【課題】鉄剤の投与以外の安全性の高い貧血治療剤、特にスポーツ選手の貧血を改善する鉄増加剤の提供。【解決手段】カテキン類を有効成分とする、高負荷運動者用血中鉄増加剤。【選択図】なし