Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Baphicacanthus cusia, also known as indigo woad root (Qing Dai or Ban Lan Gen in traditional Chinese medicine), has a longstanding history of use in East Asian herbal medicine. Traditionally, it is employed primarily for its antiviral and anti-inflammatory properties, most often to treat febrile illnesses, sore throat, and certain skin conditions. Its use for sinus congestion is less prominent but does appear in some traditional contexts, where it is sometimes included in multi-herb formulas for clearing "heat" and "toxins" that are believed to contribute to respiratory symptoms, including nasal or sinus congestion. However, direct evidence—either historical or modern clinical trial data—specifically supporting its efficacy for sinus congestion is limited. Some in vitro and animal studies suggest that Baphicacanthus cusia extracts can modulate inflammatory processes and may have mild antimicrobial effects, which theoretically could be beneficial for sinus issues that involve inflammation or infection. Nonetheless, there are no high-quality clinical trials directly evaluating its effects on sinus congestion in humans. Therefore, while its use is rooted in traditional practices, the scientific evidence for this particular indication remains weak, supporting a moderate evidence score.

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