The purpose of the present invention is to provide a novel muscle atrophy inhibitor containing an ingredient that can be taken safely over an extended period of time. It was discovered that a glycoside of quercetin, which is a type of polyphenol contained in plants and the like, has an inhibitory effect on the expression of myostatin which is involved in muscle atrophy. The present invention provides a novel muscle atrophy inhibitor containing quercetin glycoside, the muscle atrophy inhibitor having exceptional bioavailability and high safety.本發明之目的係提供含有能夠安全地長期攝取的成分之新穎的筋萎縮抑制劑。已發現屬於植物等中所包含之多酚的一種之槲皮素的配糖體係具有與筋萎縮相關之肌肉生長抑制素(myostatin)之表現抑制效果。本發明係提供體內吸收性優異，且安全性高的含有槲皮素配糖體之新穎的筋萎縮抑制劑。
