Synopsis

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

Baphicacanthus cusia, commonly known as indigo woad root or “Qing Dai” in Traditional Chinese Medicine (TCM), has long been used in East Asian herbal medicine primarily for its purported antiviral, antibacterial, and anti-inflammatory properties. In the context of treating or supporting relief from colds, particularly as a decongestant, its use is rooted in traditional practices rather than modern clinical evidence. In TCM, Baphicacanthus cusia is believed to "clear heat" and "detoxify," which indirectly associates it with treating symptoms like fever, sore throat, and occasionally congestion accompanying colds and respiratory infections.

However, while some in vitro and animal studies suggest Baphicacanthus cusia extracts have antiviral and anti-inflammatory activity, there is minimal direct scientific validation for decongestant effects or for its specific efficacy against cold symptoms in humans. Most available evidence comes from traditional herbal formulas and centuries of empirical use rather than controlled clinical trials. Thus, the evidence supporting its use for cold-related decongestion is primarily traditional, with a moderate level of historical consensus but little rigorous scientific confirmation.

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