[PROBLEMS] To provide: a composition having an excellent antioxidative activity； a food or beverage utilizing the composition； and a method for producing the composition. [MEANS FOR SOLVING PROBLEMS] Disclosed are: a composition comprising a processed product of a plant belonging to Cistache Tsubulosa (so-called "Kanka") and a processed product of a plant belonging to Withania sominifera (so-called "Ashwagandha"), wherein the composition may further comprise a processed product of a plant belonging to Panax ginseng and/or a processed product of a plant belonging to Lepidium meyanii； a food or beverage produced by using the composition； a method for producing the composition； and a method for increasing the antioxidative activity of a plant belonging to Cistache Tsubulosa.
