The present invention provides a particulate compositionwherein an oil component containing reduced coenzyme Q10 ispolydispersed forming a domain in a matrix containing a water-solubleexcipient, which simultaneously shows high oxidativestability and high oral absorbability, a production methodthereof, and a stabilizing method thereof. It also provides afood, food with nutrient function claims, food for specifiedhealth uses, dietary supplement, nutritional product, animaldrug, drink, feed, pet food, cosmetic, pharmaceutical product,therapeutic drug, prophylactic drug and the like, which containthe composition.