In relation to a functional beverage, the functional beverage includes a mother liquor and an additive solution, and the additive solution includes a poorly water-soluble natural product, an edible surfactant, an edible co-surfactant, and an edible oil.機能性飲料に係り、該機能性飲料は、母液及び添加液を含み、該添加液は、水難溶性天然物、食用界面活性剤、食用共界面活性剤及び食用オイルを含む。