Asian Plantain (Plantago asiatica), also known as Chinese plantain, has a long history of use in traditional Chinese medicine (TCM) for supporting respiratory health, including the bronchial system. In TCM, seeds and leaves of plantain are used to "clear heat," resolve phlegm, and ease coughs, making it a common remedy for bronchial conditions such as cough, bronchitis, and asthma-like symptoms. Historical texts like the “Shennong Bencao Jing” and later pharmacopoeias describe its use in managing respiratory discomfort and supporting the lungs.

Modern scientific research on Asian Plantain specifically for bronchial support is limited, though some studies suggest that extracts of Plantago asiatica possess anti-inflammatory, antioxidant, and mild antimicrobial properties, which could theoretically benefit respiratory health. Most of these studies are in vitro or animal-based, and there is a lack of robust clinical trials in humans confirming these effects for bronchial conditions. The mucilage content in plantain may help soothe irritated mucous membranes, which provides some rationale for its traditional use.

In summary, the use of Asian Plantain for supporting the bronchial system is primarily justified by traditional use, with some preliminary but inconclusive scientific support. While historical and ethnobotanical evidence is strong, modern clinical validation remains insufficient.