Qing Pi (Immature Tangerine Peel)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Qing Pi?

  Commonly 3–9 g in decoction, with some materia medica sources giving a slightly wider 3–10 g range. Because it is strongly dispersing, it is traditionally used for a defined course rather than continuously.

  Source: Sacred Lotus sources & references (Bensky; Chen & Chen). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Qing Pi?

  Qing Pi should not be used in patients with Qi deficiency, since its strong dispersing and descending action can further deplete an already-weak Qi. Long-term use is traditionally avoided for the same reason — it is meant for a defined course to break stagnation, not as an ongoing tonic.

  Source: Sacred Lotus sources & references (Bensky; Chen & Chen materia medica cautions).

Chinese Herb Toxicity & Overdose

• None Noted

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Qing Pi (immature Citrus reticulata peel)?

  Yes — mainly phytochemical and cell-based (in vitro) research, distinguishing its chemistry from mature Chen Pi and identifying candidate bioactive flavonoids. Human clinical trial data specific to Qing Pi are limited.

  • Chemical differentiation from Chen Pi (metabolomics) — GC-MS metabolomic profiling across tangerine peel maturity stages confirmed that immature (Qing Pi) and mature (Chen Pi) peel have distinct chemical signatures, with immature peel characterized by pungent terpenes and mature peel by more fragrant acetate esters and alcohols — supporting the traditional view that the two are meaningfully different medicines, not interchangeable forms of the same herb.
  • Polymethoxylated flavonoids (cell-based, preclinical) — analytical chemistry work using a breast-cancer cell (MCF-7) extraction/screening method identified sixteen polymethoxylated flavonoids in Qing Pi, including compounds such as nobiletin and tangeretin, with one minor flavonoid showing notable in vitro antitumor activity. This is laboratory, cell-based research only — not clinical evidence, and not a treatment claim.

  Sources: PMID 25976810 (GC-MS metabolomics, mature vs. immature peel, Food Chemistry); PMID 35668040 (polymethoxylated flavonoid profiling, cell-based, Phytochemical Analysis). Research context, not a therapeutic claim.

Chinese Herb Notes

• What is the difference between Qing Pi and Chen Pi?

  Qing Pi and Chen Pi come from the same tree (Citrus reticulata) but are harvested at different stages of ripeness, and this changes both their chemistry and their clinical use. Qing Pi is the immature, unripe green peel; Chen Pi is the mature, ripe orange peel that has typically been aged. Metabolomic comparison of the two shows immature peel is dominated by sharp, pungent terpenes (such as 3-carene, 4-carene, and β-pinene), while mature peel develops a milder, more fragrant profile as ripening proceeds — a chemical difference that tracks the traditional distinction in strength and direction of action.

  • Qing Pi (immature/green peel) — stronger and more aggressively descending and dispersing; it enters the Liver channel and is used to break up Qi stagnation, dissolve masses/nodules, and treat hypochondriac and hernial pain. It is not suited to long-term or unsupervised use because of its strength.
  • Chen Pi (mature/aged peel) — gentler and more harmonizing; it enters the Spleen and Lung channels and is used more broadly for Qi stagnation with dampness, poor appetite, nausea, and phlegm-damp cough — a milder, everyday digestive and Lung-qi-regulating herb by comparison.

  This Liver-vs-Spleen/Lung, strong-vs-gentle distinction is the essential teaching point separating the two herbs, even though they are botanically the same fruit at different maturities. (Traditional differentiation, not treatment advice.)

  Source: Sacred Lotus sources & references, cross-referenced against multiple online sources; PMID 25976810 (GC-MS metabolomic comparison of immature vs. mature peel chemistry).