Stabilizing method and stabilized composition of a compound having a quinone skeleton

The invention, object in a state in which a compound having a quinone skeleton and an antioxidant coexist, a method of stabilizing a compound having a quinone skeleton, as well, to provide a compound-containing composition having a stabilized quinone skeleton to. The present invention provides a composition comprising a compound having a quinone skeleton and an antioxidant, coexist in an oily substance in at least one of a compound having a quinone skeleton and an antioxidant in a state coated with Hiabura soluble coating medium either by, or characterized by comprising coexist in an aqueous substance in a state coated with a non-water-soluble coating medium at least one compound and an antioxidant having a quinone skeleton, stabilization of a compound having a quinone skeleton method, and a composition comprising a compound having a quinone skeleton. According to the present invention, even when coexisting compound and an antioxidant having a quinone skeleton can be held a compound having a quinone skeleton stably.