Polygonatum cirrhifolium (commonly known as "King Solomon's Seal") is a plant that has been used in traditional medicine systems, particularly in the Himalayas, India, and parts of China. In Ayurvedic and Tibetan medicine, roots and rhizomes of Polygonatum cirrhifolium are used for their purported restorative, tonic, and anti-inflammatory properties. Specifically, its use in supporting or treating bronchitis appears in ethnobotanical surveys and compilations of traditional remedies, where it is employed as an expectorant or to soothe coughs and respiratory irritation.

However, the scientific evidence supporting its use for bronchitis is minimal. There are a few in vitro and animal studies indicating that extracts from Polygonatum species may have anti-inflammatory, immunomodulatory, or antioxidant effects. Yet, these studies are not specific to bronchitis and mostly do not involve Polygonatum cirrhifolium directly. No robust clinical trials or pharmacological studies in humans have been published that confirm efficacy for bronchitis treatment. Therefore, the primary justification for its use in bronchitis remains traditional, with a moderate amount of traditional documentation but little direct scientific validation.

In summary, while Polygonatum cirrhifolium is traditionally used for respiratory conditions like bronchitis, scientific evidence is lacking, and its use should be considered with caution and primarily as a part of traditional herbal practices.