Asarum sieboldii, also known as wild ginger or "saishin" in traditional Chinese and Japanese medicine, has a long history of use in East Asian herbal practices, particularly for ailments relating to the respiratory system. In traditional applications, it is commonly included in herbal formulas intended to treat coughs, asthma, bronchitis, and other bronchial conditions. The plant contains essential oils and volatile compounds, such as methyl eugenol and safrole, which have been thought to possess expectorant and antitussive (cough-suppressing) properties.

Although the historical and ethnomedicinal use of Asarum sieboldii is well documented, modern scientific studies validating its efficacy for bronchial health are limited and often preliminary. Most available evidence comes from in vitro studies or animal models, with few well-controlled human clinical trials. Some research suggests mild anti-inflammatory and bronchodilatory effects, but these findings have not been robustly confirmed in clinical settings. Furthermore, the plant contains aristolochic acids, compounds of concern due to their nephrotoxic and carcinogenic potential, which limits its recommended use in modern practice.

In summary, the use of Asarum sieboldii for supporting the bronchial system is primarily justified by longstanding traditional use rather than strong scientific evidence. Caution is advised due to potential safety risks.