Mullein (Verbascum thapsus) has a long history of traditional use in supporting respiratory health, particularly for soothing the bronchial passages. Folk medicine practices, dating back centuries in Europe and North America, commonly employed mullein leaf teas, extracts, or syrups to ease coughs, bronchitis, and irritation of the respiratory tract. The plant’s mucilaginous constituents are believed to coat mucous membranes, while saponins may help loosen mucus, making it easier to expel. Additionally, mullein has been used in Native American herbalism to address similar respiratory concerns.

While traditional use is robust, scientific evidence is limited. A small number of laboratory studies have identified antioxidant, anti-inflammatory, and mild antimicrobial effects in mullein extracts, but clinical trials in humans are lacking. Reviews of herbal remedies for respiratory conditions often mention mullein as a commonly used ingredient, but also emphasize the need for more research. In summary, mullein’s use for bronchial support is primarily justified by longstanding traditional practices, with modest preliminary pharmacological evidence but insufficient high-quality clinical data to confirm efficacy by modern scientific standards.