Regulates Qi and relieves fullness - Chen Pi is a core herb for abdominal distension, bloating, chest oppression, and stagnation of the middle burner.
Dries dampness and strengthens digestive transformation - it is used when poor appetite, nausea, greasy obstruction, and sluggish digestion reflect dampness and weak Spleen transport.
Transforms phlegm and harmonizes the Lung - traditional use extends to cough, copious sputum, and phlegm-damp congestion, especially when digestion is also impaired.
Secondary Actions
Aged peel is traditionally valued more highly because time softens harshness and enhances the peel's harmonizing aromatic quality.
Chen Pi is one of the most common support herbs in formulas because it helps rich tonics and damp-resolving combinations move smoothly without creating stagnation.
Classic Formulas
Er Chen Tang - classic phlegm-damp formula in which Chen Pi regulates Qi and helps dry dampness while transforming phlegm.
Liu Jun Zi Tang - Chen Pi harmonizes the middle and helps prevent tonic ingredients from causing cloying stagnation.
Ping Wei San - uses Chen Pi to move Qi and support dampness transformation in fullness, poor appetite, and digestive obstruction.
Classical References
Traditional materia medica describe Chen Pi as acrid, bitter, and warm, entering the Lung and Spleen to regulate Qi, dry dampness, and transform phlegm.
Its blend of aromatic movement and digestive support explains why Chen Pi appears in so many formulas that address both the gut and the chest.
Modern Research
Active Compounds
Hesperidin - a signature flavanone glycoside widely used as a quality marker for Chen Pi
Nobiletin - a polymethoxyflavone studied for anti-inflammatory and metabolic effects
Tangeretin - another characteristic polymethoxyflavone of citrus peel
Limonene and other volatile oils - aromatic constituents linked to digestive and antimicrobial actions
Studied Effects
A 2023 review summarized health benefits, microbial transformations, and authenticity work around Chen Pi bioactive compounds, reinforcing its modern relevance as both a medicinal peel and a functional food ingredient (PMID 37326362).
In diabetic rats, Chen Pi protected against endothelial dysfunction and vascular inflammation, supporting ongoing cardiovascular and anti-inflammatory research interest in the peel (PMID 36558380).
Recent flavonoid-profiling and quality studies continue to deepen the chemical map of Chen Pi and help explain how aging and processing influence the herb's activity profile (PMID 38678045).