Synopsis

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

Baphicacanthus cusia (commonly known as Qing Dai or indigo naturalis) is primarily used in traditional Chinese medicine (TCM) for its supposed antiviral and anti-inflammatory properties, including the prevention and treatment of colds and flu-like symptoms. Historical records for its use date back centuries, with TCM texts listing it as an ingredient in herbal decoctions aimed at clearing heat, detoxifying the body, and reducing symptoms such as fever and sore throat commonly associated with upper respiratory tract infections.

Modern pharmacological studies have investigated some components of Baphicacanthus cusia, such as indirubin and tryptanthrin, for their potential antiviral and immunomodulatory effects. While certain in vitro and animal studies have suggested that extracts from this plant may inhibit replication of some viruses or modulate immune responses, robust clinical evidence in humans for the prevention or treatment of common colds specifically is lacking. As such, its use for colds is mainly justified by longstanding tradition, not by strong scientific validation. The overall quality of evidence is limited, and more rigorous clinical trials would be necessary to substantiate its efficacy for this indication.

Therefore, the use of Baphicacanthus cusia for the prevention of colds is largely based on traditional practices in TCM rather than high-quality scientific evidence.

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