Zhi Shi (Immature Fruit of the Bitter Orange)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Zhi Shi?

  Roughly 3–10 g in decoction — Bensky gives 3–9 g, Chen & Chen 3–10 g; it is typically stir-fried (chǎo zhí shí) to moderate its harshness, and larger doses are reserved for acute, excess presentations such as constipation with abdominal fullness. It is generally decocted with the other herbs of a formula.

  Source: Sacred Lotus sources & references (Bensky and Chen & Chen dosage ranges as recorded on file). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Zhi Shi?

  Zhi Shi should be used with caution in pregnancy and in patients who are weak or have Spleen/Stomach deficiency — its strong, breaking, descending action can be too forceful for a depleted or frail constitution, and traditional sources caution against its use in pregnancy given its qi-moving, purgative-assisting character.

  • Pregnancy — use with caution; avoided or reserved to a qualified practitioner's judgment.
  • Weak/deficient patients — caution in Spleen and Stomach qi deficiency, since the herb's breaking action can further tax a weak digestion.

  Source: Sacred Lotus sources & references; cross-referenced against multiple online sources.

Chinese Herb Toxicity & Overdose

• Low at traditional decoction doses. The whole, decocted immature fruit used in Chinese medicine has a long history of use at the standard 3–10 g range without significant reported toxicity. This is a distinct matter from concentrated p-synephrine/bitter-orange-extract dietary supplements (see Research), which deliver a much higher, standardized dose of the fruit's adrenergic-acting compounds than a decocted herb does.

  Source: materia medica consensus; NCCIH bitter-orange consumer safety review (cited below). Reference note, not a safety guarantee.

Herb-Drug Interactions

• No well-established interactions are documented for the decocted herb at traditional doses. Concentrated bitter-orange/p-synephrine extracts (a different product from the TCM decoction) carry documented caution around stimulant-type combinations and case reports of cardiovascular events in supplement users — relevant to disclosure for patients also taking bitter-orange weight-loss or sports supplements, but not established for the traditional decocted herb itself. (Flagged for practitioner confirmation.)

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 Zhi Shi / bitter orange (Citrus aurantium)?

  Yes, but almost all of it concerns concentrated bitter-orange extract and its marker compound p-synephrine as a dietary supplement — not the decocted Chinese-medicine herb. This is an important distinction: a decoction of the whole immature fruit delivers p-synephrine and related compounds at far lower, less concentrated levels than a standardized weight-loss or sports-performance extract.

  • Safety/mechanism review — a widely cited pharmacology review concluded that roughly 30 human studies indicate p-synephrine and bitter-orange extract do not produce significant cardiovascular effects or act as stimulants at commonly used supplement doses, and that its mechanism differs from ephedrine despite structural similarity (PMID 28752649).
  • Systematic review/meta-analysis — a 2022 systematic review and meta-analysis of bitter-orange extract and p-synephrine trials concluded that overall safety and efficacy “have not been fully established,” reflecting mixed and limited-quality trial evidence (PMID 36235672).
  • Cardiovascular RCT — a randomized, placebo-controlled crossover trial in healthy adults evaluated the cardiovascular safety of oral p-synephrine (PMID 26948284).
  • Case reports and consumer-safety review — regulatory/consumer-health reviews note case reports of serious cardiovascular events (heart attack, stroke, arrhythmia) in users of bitter-orange-containing supplements, and flag quality-control problems including mislabeled synephrine content and adulteration with non-permitted synthetic amines in some commercial products; it is generally unclear whether bitter orange alone, other stimulant ingredients in combination products, or adulterants were responsible.

  Note: The supplement-safety literature above concerns concentrated p-synephrine/bitter-orange extract products, which are chemically related to but pharmacologically distinct in dose and concentration from the decocted Zhi Shi used in Chinese medicine formulas; readers should not conflate supplement case reports with the traditional decocted herb.

  Sources: PMID 28752649 (Phytother Res, 2017); PMID 36235672 (Nutrients, 2022); PMID 26948284 (Phytother Res, 2016); NCCIH bitter-orange consumer information. Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Zhi Shi different from Zhi Ke, and what formulas is it in?

  Zhi Shi and Zhi Ke come from the same bitter orange tree but are harvested at different stages: Zhi Shi is the small, immature (green) fruit, Zhi Ke the larger, mature fruit — and this difference in maturity tracks a real difference in strength and direction. Zhi Shi is stronger, more purgative/breaking, and more strongly descending, aimed at the epigastrium and abdomen; Zhi Ke is milder and gentler, working more on the chest and diaphragm and better tolerated in weaker patients. In practice they are often interchangeable at need, but the distinction is worth preserving when matching herb to severity.

  • Da Cheng Qi Tang and Xiao Cheng Qi Tang (Major/Minor Order the Qi Decoction) — with Da Huang and Mang Xiao (Da Cheng Qi Tang) to purge heat-excess constipation with abdominal fullness and pain; Zhi Shi's breaking, descending action assists the purgation.
  • Si Ni San (Frigid Extremities Powder) — with Chai Hu, Bai Shao, and Zhi Gan Cao, to spread constrained Liver qi and redirect yang qi to the extremities in Liver-qi-constraint patterns with cold extremities.
  • Also appears in formulas such as Zhi Zhu Wan (with Bai Zhu, for Spleen-deficiency food stagnation), Zhi Shi Xiao Pi Wan, Wen Dan Tang, and Da Chai Hu Tang. (Traditional formula context, not treatment advice.)

  Source: Sacred Lotus sources & references (formula links); cross-referenced against multiple online sources.