Synopsis

Source of validity: Traditional
Rating (out of 5): 3

Chen pi (dried tangerine peel) is a well-known ingredient in Traditional Chinese Medicine (TCM), historically used to treat various respiratory and digestive conditions, including cough, particularly the "spastic" or persistent, non-productive type. In TCM theory, chen pi is classified as an herb that regulates qi (vital energy) and dries dampness. It is believed to disperse phlegm and harmonize the middle burner (digestive system), which in turn can help relieve cough, especially when associated with phlegm and qi stagnation. Classic TCM texts, such as the "Compendium of Materia Medica" (Bencao Gangmu), document its use in formulas aimed at treating cough and chest congestion.

Modern scientific studies on chen pi’s effect on cough are limited but suggest possible mechanisms. Some laboratory studies indicate that chen pi contains volatile oils and flavonoids with anti-inflammatory, antitussive (cough-suppressing), and expectorant effects. Animal studies have shown that extracts of chen pi can reduce coughing induced by irritants, likely due to modulation of airway inflammation and mucus production. However, robust human clinical trials are lacking, and most evidence remains preclinical or based on traditional usage.

In summary, the use of chen pi for spastic cough is primarily justified by traditional practice, with some preliminary scientific evidence suggesting plausibility. The overall evidence rating is moderate based on centuries of traditional use and emerging, but not definitive, scientific support.

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