"The allergy-inducing matter (allergen) can be, e.g., cedar pollen, grass pollen, and inhaled allergens such as mites, house dust, animals, fungi (mold), and insects.In the present invention, tannic acid is used as the antigenicity-reducing component.The tannic acid disclosed in Japanese Examined Patent Application Publication Number Hei 2-16731 can be used as the tannic acid here." . . . . .