PURPOSE: A composition derived from native plants is provided to prevent or treat hypersensitive dermatitis such as atopic dermatitis without side effects. CONSTITUTION: A composition for preventing and treating atopic dermatitis contains extract of ulmus davidiana bark, Cassiae Semen, and Taraxacum platycarpum as an active ingredient. The extract is isolated using water, low alcohol of 1-4 carbon atoms, solution of low alcohol, non-polar solvent or mixture solvent thereof. The non-polar solvent is dichloromethane, chloroform, diethyl ether, ethyl acetate, hexane, or supercritical fluid. A cosmetic product or health food contains the composition for preventing and treating atopic dermatitis as an active ingredient.본 발명은 국내 자생식물 유래 아토피성 피부염 예방 및 치료용 조성물에 관한 것으로, 유근피, 결명자 및 포공영 추출물을 유효성분으로 포함하여 과량 복용시에도 부작용 없이 아토피성 피부염으로 대표되는 과민성 피부질환을 예방하거나 치료한다.
