Purpose of this invention is superior in heart malfunction improvement or heart functional maintenance action, at the same time, it is to offer the oral composition whose safety is high. In order that these inventors solve the above-mentioned topic, ardency by the fact that the especially restoration type coenzyme Q is used even in the coenzyme Q where the result and the safety which are researched are high the fact that you can obtain the useful composition vis-a-vis heart malfunction improvement or heart functional maintenance was discovered. Namely, this invention, offers the heart malfunction improvement medicine or the heart functional maintenance medicine, and contain that the medical supply, the food, the medical supply for the animal and the fodder etc for the animal which designate the restoration type coenzyme Q as the active ingredient.本発明の目的は心機能不良改善または心機能維持作用に優れ、且つ、安全性の高い経口組成物を提供することである。本発明者らは上記課題を解決すべく鋭意研究した結果、安全性の高い補酵素Qの中でも特に還元型補酵素Qを用いることで心機能不良改善または心機能維持に対して有用な組成物が得られることを見出した。すなわち、本発明は、還元型補酵素Qを有効成分とする心機能不良改善剤または心機能維持剤、およびそれを含有する医薬品、食品、動物用医薬品、動物用飼料などを提供する。
