Fruits and seedsQi-regulatingFructus Aurantii Immaturus

Zhi Shi (Immature Bitter Orange)

A practical guide to Zhi Shi: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

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Last reviewed Oct 13, 2026

Quick Facts

Latin NameFructus Aurantii Immaturus
Chinese Name & Pinyin 枳實 · Zhi Shi
Medicinal PartFruits and seeds
The herbZhi Shi is the dried, small, spherical young fruit of bitter orange or sweet orange. Zhi Qiao is larger and more mature. Common forms: raw and bran-fried.
Nature and channelsBitter, acrid, sour, slightly cold. Enters the Spleen and Stomach. Bitterness drains and breaks. Acridity moves and disperses.
Pharmacopoeia lineBreaks qi and disperses accumulation. Transforms phlegm and dissipates focal distention. Used for internal accumulation, focal fullness and distending pain, dysentery with tenesmus, stool that will not pass, phlegm-qi blocking chest-bi, and visceral prolapse.
Pattern cuesFocal fullness and pain. Tenesmus. Bound stool. Chest-bi. Wiry excess pulse.
In this articleZhi Shi versus Zhi Qiao, Hou Po, and Lai Fu Zi. Raw versus bran-fried. Why pregnancy and qi deficiency should not meet fierce breaking. Why it is not a weight-loss extract. Who should skip it.

What Is Zhi Shi?

Zhi Shi (枳实; Zhǐ Shí; Latin: Aurantii Fructus Immaturus; English: immature bitter orange) is the dried young fruit of Citrus aurantium L., a cultivated variety, or sweet orange. In Chinese medicine it is a qi-moving herb. It is bitter, acrid, sour, and slightly cold, enters the Spleen and Stomach channels, and its core actions are to break qi and disperse accumulation, and to transform phlegm and dissipate focal distention. It is not Zhi Qiao. Zhi Qiao is larger and milder; it moves qi, eases the middle, and reduces bloating. Zhi Shi is smaller and fiercer; it breaks qi, disperses accumulation, and dissipates pi. Same bitter orange; one is moderate, one is drastic. Do not mix them on a script. It is not a bitter-orange fat-burner extract. Bran-fried Zhi Shi is slightly less harsh. Avoid or use with caution in pregnancy. Do not use fierce breaking alone when qi is already sinking and there is no accumulation.

It is used most often for three patterns:

  • Accumulation lodged internally — focal fullness and distending pain, stool that will not pass
  • Dysentery with tenesmus
  • Phlegm stagnation blocking qi in chest-bi / visceral prolapse — prolapse must ride with qi-tonifying herbs and a practitioner

The usual decoction dose is 3–10 g. Qi deficiency with no accumulation, and a cold weak spleen, should not be over-broken. Bitter, acrid, and slightly cold, it is not a daily “pi fruit.” Breaking when there is no accumulation consumes middle qi.

When food and phlegm stagnate and qi knots in the middle, hard fullness, tenesmus, and bound stool are common. Zhi Shi is bitter-draining and acrid-opening. It breaks, disperses, and dissipates pi, which is why it appears in Zhi Zhu Wan, Hou Po San Wu Tang, and Zhi Shi Xiao Pi Wan. It breaks more than it tonifies. Shortness of breath, no desire to speak, and a weak pulse become weaker if more breaking is added.

Zhi Shi is not a catch-all for fullness or constipation. In qi deficiency, pregnancy, or breaking when there is no accumulation, using it alone can consume qi and unsettle a pregnancy. Immature fruit or larger fruit should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Zhi Shi Immature Bitter Orange

Zhi Shi: Materia Medica Profile

Identification & Quality Standard

Fructus Aurantii Immaturus

Botanical Origin

The dried young fruit of Citrus aurantium L., and its cultivar Citrus sinensis (L.) Osbeck.(Rutaceae).

Production Regions

Primarily produced in the Chinese provinces of Sichuan, Hunan, Jiangxi.

Quality Requirements

Superior medicinal material has greenish-black skin, thick and white flesh, little pulp, and a firm texture.

Macroscopic Features

Semi-spherical, occasionally spherical, 0.5~2.5cm diameter. Exocarp is black-green or dark brownish-green, with granular protuberances and wrinkles, with obvious remnants of style or fruit stem scars. Mesocarp on cut surface is slightly raised, yellowish-white or yellowish-brown, 0.3~1.2cm thick, edges have 1-2 rows of oil ducts, pulp is brown. Hard texture. Clear aromatic odor, bitter and slightly sour taste.

Authentic Regions and Quality Identification

While it is grown in various regions like Jiangxi, Sichuan, Hunan, and Zhejiang, the fruits from Jiangxi and Sichuan are historically prized for their high quality.

  • Quality Markers: Premium Zhi Shi is half-spherical with a dark green or brownish-black, bumpy exterior. It is hard, with a thick yellowish-white inner flesh, a fragrant scent, and a bitter, sour taste.
  • Identification: It is important not to confuse it with other small citrus fruits, which typically have thinner flesh and a weaker scent.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Bitter, Acrid, Sour; WarmSpleenStomachLarge Intestine

1. Historical Herbal Records

  • Shen Nong Ben Cao Jing: Classified it as a medium-grade herb, noting its ability to clear stagnation and benefit the organs.
  • Ben Cao Gang Mu: Clarified its modern use for organ prolapse (like stomach or uterine prolapse) and established the distinct clinical differences between Zhi Shi and Zhi Ke.
  • Classic Pairings: Historically, it is paired with Bai Zhu (Atractylodes Rhizome) to relieve severe bloating, with Da Huang (Rhubarb) to treat heat-induced constipation, or with Gan Jiang (Dried Ginger) to resolve cold-induced digestive blockages.

2. Evolution of Medicinal Understanding

Over the centuries, the medical understanding of Zhi Shi shifted. While ancient texts briefly mentioned it might "benefit Qi," later TCM masters strongly disagreed. Master Li Dongyuan emphasized its harsh, draining nature, warning that it should never be used on people with weak constitutions. Later experts highlighted its precise role in breaking through stubborn phlegm, trapped food, and severe abdominal bloating.

Zhi Shi Immature Bitter Orange

Core Efficacies & Traditional Applications

Traditional Functions

Breaks qi, resolves accumulation, transforms phlegm, disperses focal distention. Apply to inner stagnation, fullness and distention and swelling pain, constipation, diarrhea and tenesmus, chest stasis, ptosis of the stomach; uterine prolapse; prolapse of the anus.

1. Primary Focus: Breaking Qi and Reducing Accumulation

  • Traditional Function: Zhi Shi (Immature Bitter Orange) is heavily relied upon to unblock stagnant energy (Qi) and eliminate bloating or fullness caused by severe indigestion.
  • Target Symptoms: It is ideal for severe food stagnation and Qi blockage due to overeating or a sedentary lifestyle. Symptoms include severe abdominal bloating, pain that worsens with pressure, nausea, burping, loss of appetite, and constipation.
  • Common Pairings: It is frequently paired with Shan Zha (Hawthorn Fruit) or Mai Ya (Barley Sprout) to boost digestion, or with Hou Po (Magnolia Bark) to relieve intense bloating. For constipation, it is sometimes combined with Da Huang (Rhubarb).
  • When to Avoid: Pregnant women and individuals with Qi deficiency (chronic fatigue, shortness of breath, spontaneous sweating) should absolutely avoid using it on their own, as its harsh nature can drain the body's vital energy.

2. Secondary Focus: Resolving Phlegm and Relieving Fullness

  • Traditional Function: It helps clear thick phlegm that blocks the chest and diaphragm, restoring the smooth flow of Qi.
  • Target Symptoms: Used for chest tightness, nausea, phlegm-heavy coughs, and a feeling of a "blocked" stomach accompanied by dizziness or a heavy body sensation.
  • Common Pairings: Often combined with Ban Xia (Pinellia Tuber) and Fu Ling (Poria) to enhance phlegm clearing, or with Gua Lou (Trichosanthes Fruit) to open the chest.
  • When to Avoid: People with Yin deficiency (dry mouth, hot palms/soles, red tongue) should avoid it, as Zhi Shi is slightly cold and drying, which can worsen dry conditions.

3. Common Herb Pairings: Synergistic Duos

  • A classic medical duo is Zhi Shi (Immature Bitter Orange) and Bai Zhu (Atractylodes Rhizome).
  • Why it works: Bai Zhu strengthens the Spleen and boosts Qi, while Zhi Shi breaks stagnation. Together, they balance each other perfectly—Bai Zhu protects the stomach from the harshness of Zhi Shi, and Zhi Shi prevents Bai Zhu from causing further bloating. This pairing is excellent for cases of Spleen deficiency combined with heavy food stagnation. Note: This requires a professional diagnosis to get the dosage ratio right.

Zhi Shi Immature Bitter Orange

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. Main Chemical Components

Modern analysis shows that Zhi Shi contains essential oils (like limonene), flavonoids (such as hesperidin), and alkaloids (including synephrine). While lab tests indicate these compounds can interact with intestinal muscles, these isolated results do not directly translate to human clinical outcomes.

2. Modern Pharmacological Focus

Current scientific research mostly explores how Zhi Shi regulates gastrointestinal movement. Studies suggest it may help improve poor gut motility and ease digestion. However, this research is heavily focused on isolated chemicals rather than the traditional herbal preparation.

3. Limitations of Modern Research

  • Lab vs. Life: Animal and test-tube studies occur under strict conditions that do not perfectly mirror human digestive systems.
  • Extracts vs. Whole Herbs: Modern studies often test single, extracted chemicals. In traditional practice, the whole Zhi Shi is boiled into a water decoction, which creates a very different chemical profile.
  • Dosage Differences: Lab experiments frequently use highly concentrated doses that do not match traditional clinical usage.
  • Holistic Synergy: TCM relies on the combined, synergistic effect of the whole herb (and the entire herbal formula), which cannot be judged by isolating just one active ingredient.

Zhi Shi Immature Bitter Orange

Comparing Similar Herbs

1. Shared Traits with Similar Herbs

Zhi Shi (Immature Bitter Orange) and Zhi Ke (Bitter Orange) both come from the same citrus plants and are used to regulate Qi and relieve bloating. Both require caution if you have a weak constitution, and both frequently appear in Qi-regulating formulas.

2. Core Differences

  • Nature and Strength: Zhi Shi is the young, unripe fruit. It is harsh, strong, and has a heavy "downward-pushing" action. Zhi Ke is the older fruit. It is much gentler and milder.
  • Action Focus: Zhi Shi acts like a sledgehammer, breaking through heavy food accumulation and stubborn phlegm blockages. Zhi Ke acts like a gentle massage, smoothing out mild chest tightness and stomach bloating.
  • Target Symptoms: Use Zhi Shi for severe abdominal pain, heavy constipation, and intense bloating that hurts to touch. Use Zhi Ke for mild, everyday chest or rib discomfort and mild bloating.

3. A One-Sentence Summary

Zhi Shi (Immature Bitter Orange) is your heavy-duty specialist for breaking severe stagnation and trapped phlegm, while Zhi Ke (Bitter Orange) is your gentle choice for smoothing mild chest and stomach bloating.

Zhi Shi Immature Bitter Orange

Classical Formulas Containing Zhi Shi

+6 more

Formulas vs. Single Herbs

  • Synergy is Key: A formula is a balanced team. The healing power comes from how the herbs interact, so a single herb cannot simply replicate a full formula's effects.
  • Holistic Balance: The exact dosage and combination in a formula affect the entire body. Never try to mix or alter these formulas at home based on internet articles.

Diet & Daily Home Use

1. Home Herbal Teas and Meals

  • Zhi Shi and Chen Pi Tea:
    • Ingredients: 3g Fu Chao Zhi Shi (Bran-fried Immature Bitter Orange), 3g Chen Pi (Tangerine Peel), 5g Chao Mai Ya (Stir-fried Barley Sprout).
    • Method: Rinse ingredients, place in a teapot, and steep with boiling water for 10 minutes.
    • Best For: Occasional mild bloating or indigestion after a heavy meal.
    • Avoid If: You are pregnant, or have Qi or Yin deficiency.
    • Frequency: 1-2 times a week. Not for long-term daily use.
  • Zhi Shi and Hawthorn Porridge:
    • Ingredients: 2g Fu Chao Zhi Shi, 5g Shan Zha (Hawthorn Fruit), 50g rice.
    • Method: Boil the rice until half-cooked, add the herbs, and simmer until fully cooked. Add a pinch of salt.
    • Best For: Poor appetite and stomach fullness due to mild food stagnation.
    • Avoid If: You have a weak stomach, frequent diarrhea, or are pregnant.

2. Preparation Differences

  • Always use the bran-fried version (Fu Chao Zhi Shi) for home wellness, as the raw version (Sheng Zhi Shi) is too harsh and aggressive for daily use.
  • Brewing: It can be boiled directly with other herbs for 15-20 minutes without any special pre-boiling steps.

3. Dosage and Usage Cycles

  • Dosage: Clinical doses run from 3-10g. For home food therapy, keep it very low (2-5g).
  • Duration: Do not use continuously for more than 3 days. It is for short-term symptom relief, not a daily health supplement.
Zhi Shi Immature Bitter Orange

Contraindications & Safety Warnings

1. Who Should Avoid It

  • Deficiency Patterns: Anyone with Qi deficiency (chronic fatigue) or Yin deficiency (dryness/heat), as well as those with chronic diarrhea.
  • Vulnerable Populations: Pregnant and nursing women must avoid it. It can affect the pregnancy or pass through breast milk. Children and the elderly should only use it under medical supervision.
  • Underlying Conditions: People with liver or kidney dysfunction should be cautious, as the herbs must be metabolized by these organs.

2. Medication Interactions and Dietary Notes

  • Drug Interactions: Zhi Shi can interact with blood thinners, blood pressure meds, sedatives, and diabetes medications. For instance, it can amplify blood pressure meds, causing your pressure to drop too low.
  • Safety Rule: If you take prescription medications, always consult your doctor or pharmacist before brewing this herb.

3. Adverse Reactions and Overdose

  • Side Effects: Taking too much can cause severe nausea, vomiting, abdominal cramps, and diarrhea. Some may experience allergic skin rashes.
  • Emergency Response: If you experience severe pain, persistent vomiting, breathing difficulties, or rapid worsening of symptoms, stop use immediately and go to a hospital.

Frequently Asked Questions About Zhi Shi

What is Zhi Shi? Are Zhi Qiao, Qing Pi and Hou Po the same?
Official Zhi Shi (枳实) is the dried young fruit of Citrus aurantium and its cultivars or Citrus sinensis. The pharmacopoeial name is Aurantii Fructus Immaturus. It is younger than Zhi Qiao and stronger at breaking qi. Zhi Qiao is the larger unripe fruit: regulates qi, expands the middle, moves stagnation and disperses distention—gentler. Qing Pi is unripe tangerine peel or young fruit: soothes the Liver and breaks qi. Hou Po is bitter-acrid-warm: dries damp, dissolves phlegm and downbears qi to eliminate fullness—a bark. Write Zhi Shi or bran-fried Zhi Shi. It is not kitchen green orange. Use caution in pregnancy.
What are the TCM properties and traditional uses of Zhi Shi?
According to the Chinese Pharmacopoeia, Zhi Shi is bitter, acrid, sour and slightly cold, enters the Spleen and Stomach channels, and acts to break qi and reduce accumulation, transform phlegm and dissipate focal distention. It is used for accumulation lodged internally, focal distention and painful fullness, dysentery with tenesmus, blocked stool, phlegm stagnation obstructing qi, chest-bi, bound chest and visceral prolapse. Bitter-acrid and slightly cold, it suits excess accumulation and focal fullness—not Spleen-Stomach deficient cold without accumulation, or large doses in pregnancy.
How do you choose raw versus bran-fried Zhi Shi? How does it differ from Zhi Qiao?
Raw Zhi Shi breaks qi more fiercely; bran-fried Zhi Shi is milder and often used for gastrointestinal accumulation. Zhi Shi breaks qi, reduces accumulation, transforms phlegm and dissipates focal distention more fiercely—fullness, tenesmus, bound chest and blocked stool; Zhi Qiao is gentler—chest-flank expansion of the middle. Visceral prolapse needs qi-tonifying partners; do not break qi alone.
What is the usual dosage? Can it be drunk daily as an accumulation-moving tea?
The pharmacopoeial decoction dose is 3–10 g. It is not a four-season “Zhi Shi constipation tea.” Vacuity without accumulation only sinks further as qi is broken. Focal fullness, tenesmus and constipation need a practitioner to name raw or bran-fried and a short course.
What are the contraindications? Can it be used in pregnancy?
Use caution in pregnancy. Use caution in Spleen-Stomach deficient cold and in qi vacuity sinking without excess accumulation. Reduce or stop if abdominal pain and loose stool appear. Acute abdomen and obstruction are emergencies—do not rely on Zhi Shi alone.
Can Zhi Shi reduce accumulation, dissipate focal distention and free the stool?
It can help food accumulation with qi stagnation and phlegm focal distention. Accumulation with fullness joins Atractylodes in Zhi Zhu Wan. Damp-heat accumulation joins rhubarb, Coptis and Scutellaria in a Zhi Shi Dao Zhi Wan type formula. Yangming fu excess joins rhubarb and Magnolia bark in Xiao Cheng Qi Tang. Chest-bi with phlegm obstruction joins Trichosanthes and Allium. It breaks qi, reduces accumulation, transforms phlegm and dissipates focal distention—not a specific for every constipation or every bloating. Severe abdominal pain and stopped vomiting are emergencies.
Can Zhi Shi be drunk daily as a slimming, laxative or anti-bloating tea?
Excess accumulation and focal fullness may enter a short formula; qi vacuity and pregnancy only grow more depleted as qi is broken. “Zhi Shi slims and frees the stool” does not replace gastrointestinal assessment. Breaking qi, reducing accumulation, transforming phlegm and dissipating focal distention should name Zhi Shi 3–10 g.
How do you choose among Zhi Shi, Zhi Qiao, Hou Po, Da Huang and Bai Zhu?
Zhi Shi is bitter-acrid-sour and slightly cold: breaks qi, reduces accumulation, transforms phlegm and dissipates focal distention—fierce, fullness, tenesmus and bound chest. Zhi Qiao is bitter-acrid-sour and slightly cold: regulates qi, expands the middle, moves stagnation and disperses distention—gentler, chest-flank. Magnolia bark is bitter-acrid-warm: dries damp, dissolves phlegm and downbears qi to eliminate fullness—damp fullness with phlegm. Rhubarb is bitter-cold: drains downward, attacks accumulation, clears heat, drains fire and expels stasis. Atractylodes is bitter-sweet-warm: strengthens Spleen qi, dries damp and promotes urination—tonifies the Spleen to govern accumulation. Excess accumulation favors Zhi Shi; chest-flank expansion favors Zhi Qiao; damp fullness favors Hou Po; heat bind constipation favors Da Huang; Spleen vacuity with accumulation favors Bai Zhu with Zhi Shi (Zhi Zhu Wan). They may be paired; pregnancy and qi vacuity without accumulation caution Zhi Shi.
Which herbs is Zhi Shi combined with? What are the representative formulas?
Spleen vacuity with food accumulation joins Atractylodes in Zhi Zhu Wan. Damp-heat accumulation appears in Zhi Shi Dao Zhi Wan. Mild Yangming downward draining appears in Xiao Cheng Qi Tang (rhubarb, Magnolia bark, Zhi Shi). Write Zhi Shi or bran-fried Zhi Shi 3–10 g; use caution in pregnancy.
How do you choose and store Zhi Shi?
Choose small firm fruits with a yellow-white cross-section, scant pulp sacs, a strong aroma and a bitter-sour taste. Moldy, moth-eaten, hollow and scentless lots are discarded. Store cool and dry against moths. Buy pharmacopoeial Zhi Shi; do not replace breaking qi, reducing accumulation, transforming phlegm and dissipating focal distention with Zhi Qiao, Qing Pi or an unidentified young fruit by equal weight.

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Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.

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Zhi Shi (Immature Bitter Orange): Break Stagnant Qi, Reduce Accumulation, and Transform Phlegm