The present invention relates to a method of producing reduced coenzyme Q10, including reducing oxidized coenzyme Q10 using a reducing agent in terpenes that can highly dissolve oxidized coenzyme Q10 and reduced coenzyme Q10 in the co-existence of at least one kind of additive selected from the group consisting of alcohols, water, a surfactant and diacylglycerol. In addition, the present invention relates to a composition comprising terpenes, a reducing agent, reduced coenzyme Q10 and at least one kind selected from the group consisting of alcohols, water, a surfactant and diacylglycerol, and a method of stabilizing reduced coenzyme Q10 comprising preparing the composition.
