Aristolochic acid is a purified form of the active substance found in plants of the birthwort family, many of which are native to northern mainland China and Japan. It is effective at lowering blood pressure, clearing the lungs, and spurring urination.
馬兜鈴酸是馬兜鈴科植物淬取出的純化物，盛產於中國大陸北方及日本，具有降血脂、清肺、利尿等作用。