The active ingredient in this spray is tannic acid which has been medically proven to denature mite and cat allergen protein rendering it permanently non-allergenic. ADS Spray will also neutralize allergens from plant and grass pollens, mold and mildew. This medically proven spray neutralizes allergens on contact for up to three months. Can be used for upholstered furniture, carpeting, heavy curtains, etc. Safe for people, pets and the environment.