The present invention aims to provide reduced coenzyme Q10, which is useful as food, food with nutrient function claims, food for specified health use, nutritional supplement, nutritional product, animal drug, drink, feed, cosmetic, pharmaceutical product, therapeutic drug, prophylactic drug and the like, and a production method of reduced coenzyme Q
10
. The present invention provides a production method of reduced coenzyme Q
10
, which includes reducing oxidized coenzyme Q
10
with ascorbic acid or its analogue(s) as a reducing agent in a water-containing organic solvent at not more than pH 5. Using the method, the reaction time can be drastically shortened even without adding a basic substance and the like, and unpreferable side reactions can be minimized. Therefore, reduced coenzyme Q
10
with high quality can be produced.
                            本发明旨在提供一种可用于食品、具有营养功能声明的食品、特定保健用途食品、营养补充剂、营养产品、动物药品、饮料、饲料、化妆品、药品、治疗药物、预防药物等用途的还原型
辅酶Q10及其生产方法。本发明提供了一种还原型
辅酶Q10的生产方法,该方法包括在含
水有机溶剂中,以
抗坏血酸或其类似物作为还原剂将氧化的
辅酶Q10还原至不超过pH5。使用该方法,即使不添加碱性物质等,反应时间也可以大大缩短,并且可以将不良的副反应最小化。因此,可以生产出高质量的还原型
辅酶Q10。