A practical guide to Chao Zi Su Zi: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.
Last reviewed Oct 28, 2026| Latin Name | Perillae Fructus |
|---|---|
| Chinese Name & Pinyin | 炒紫蘇子 · Chao Zi Su Zi |
| Medicinal Part | Fruits and seeds |
| The item | Chao Zi Su Zi is the stir-fried seed of the perilla plant. Chao Lai Fu Zi (radish seed) and fresh perilla leaves are not this drug. |
| Nature and channels | Warm, acrid. Enters the Lung and Large Intestine. Warm acrid sends lung qi down, transforms phlegm, moistens the intestines, and frees the bowels. |
| Pharmacopoeia line | Sends qi down and transforms phlegm; moistens the intestines and frees the bowels. Used for cough and wheeze with phlegm, and dry constipation. |
| Pattern cues | Choppy breath. Cough with thin phlegm. Winter coughs. Dry hard stools. Difficulty passing stools. |
| In this article | Chao Zi Su Zi versus Chao Lai Fu Zi. Descending lung qi versus moving stuck food. Why lung-heat and loose stools should skip it. Home tea. |
Chao Zi Su Zi (炒紫苏子; Chǎo Zǐ Sū Zǐ; Latin: Perillae Fructus; English: stir-fried perilla seed) is the dried seed of the perilla plant, gently stir-fried until fragrant — the small purple-brown seed of the herb whose leaves season fish dishes. It is warm and acrid, enters the Lung and Large Intestine channels, and its core actions are to send rebellious lung qi down and transform phlegm, and to moisten the intestines and free the bowels. It is the gentle mover for autumn coughs and dry stools. The usual amount is 5–10 g in a decoction, crushed to release the oils. It does not need first, last, or wrapped decoction handling.
It is not Chao Lai Fu Zi. Radish seed is neutral, acrid, and sweet, and it works more on digestion — moving stuck food and qi in the stomach, with less of this seed's lung and intestine moisture. It is not the fresh perilla leaf of the kitchen either; the seed is the medicinal piece. In lung-heat cough — yellow phlegm, dry mouth, fever — or in spleen-deficiency loose stools, using it on your own is a poor match. Cough and wheeze that keep worsening, or fever with chest tightness, needs a clinic first. Do not take it yourself for a long time.
It is used most often for three patterns:
Warm and acrid, it is not a daily "breath and bowel herb" to keep increasing. Sending qi down and moistening when there is no rebellious qi or dryness, or in lung-heat, adds heat instead of helping.
When lung qi rebels upward — from autumn chill or cold striking inside — breath turns choppy, cough comes in bursts, and phlegm sits thin and clear; when the intestines run dry, stools turn hard. Chao Zi Su Zi is warm and acrid. It sends the qi down and moistens the gut, which is why it appears in Su Zi Jiang Qi Tang (Perilla Seed Qi-Descending Decoction)–type formulas. It descends more than it holds. In lung-heat cough, or in spleen-deficiency loose stools, more makes it worse.
Chao Zi Su Zi is not a catch-all cough or bowel herb. In lung-heat, in spleen-deficiency loose stools, or with no rebellious qi or dryness, using it alone is a poor match. Whether it belongs in a formula, and at what dose, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.
Identification & Quality Standard
Perillae Fructus
Botanical Origin
The dried ripe fruit of Perilla frutescens (L.) Britt. (Lamiaceae), stir-fried.
Production Regions
Primarily produced in Hubei, Henan, Sichuan, Guangdong.
Quality Requirements
Superior is full, brown, oily.
Spherical, 1.5mm diameter. After stir-frying, surface is dark brown, slightly swollen, fragrant. Broken with oily cotyledons.
Classic texts and trade experience favor seeds from several eastern provinces, but quality still depends on variety, harvest time, processing, and storage. Chao Zi Su Zi is ovoid or round, dark brown on the surface with a faint raised netted texture, brittle, oily when crushed, with a clean acrid fragrance — the fried aroma softer and heavier than the raw seed. The common look-alike is a seed of another mint-family plant — larger, paler, fainter-smelling, less oily — check before buying.
Acrid; WarmLung
These are the clinical observations of their time, not modern medical conclusions.
Some early doctors leaned on the warming, tonifying side — supplementing qi deficiency for colder bodies; others stressed the clearing, phlegm-transforming side — for cough and wheeze with lung heat or phlegm-damp; still others drew the line — it moistens the bowel, so it is wrong for spleen-deficiency diarrhea. The range is clear: useful, but not universal.
Traditional Functions
Downbears qi and resolves phlegm, stops cough and calms panting, moistens intestines and promotes bowel movement.
(1) Traditional action: settling rebellious lung qi and easing cough and wheeze. (2) Typical patterns: cough with choppy breath, thin white or sticky phlegm — especially autumn-winter coughs from external or internal cold. (3) Usual pairings: Bai Jie Zi (white mustard seed) and Lai Fu Zi (radish seed) — the classic San Zi Yang Qin Tang pairing — to strengthen the phlegm-transforming, qi-descending work. (4) Not for self-use: lung-heat cough — yellow phlegm, dry mouth, fever — the warmth can add to the heat.
(1) Traditional action: easing constipation from dry intestines. (2) Typical patterns: dry, hard stools that are hard to pass — especially the elderly with a dry constitution, or long illness leaving the intestines short of fluids. (3) Usual pairings: Huo Ma Ren (hemp seed) and Yu Li Ren (bush-cherry seed) to strengthen the moistening. (4) Not for self-use: spleen-deficiency loose stools — frequent, thin bowel movements — the moistening can add to the diarrhea.
Chao Zi Su Zi pairs classically with Xing Ren: the perilla seed sends lung qi down and transforms phlegm; the apricot kernel stops cough, calms wheeze, and moistens the bowel. Together they strengthen the qi-descending, cough-easing work while moistening — for rebellious lung qi with dry, bound stools, such as a coughing person with constipation. This pair belongs to a practitioner's pattern diagnosis, not self-pairing.
Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.
Detected in the seed are fatty oil at about 30–50%, plus perillaldehyde, linolenic acid, vitamin E, and sterols. In vitro, some extracted components show anti-inflammatory activity — a single-component result, not a human effect; in animal experiments, extracts show some cough-easing and wheeze-calming tendency. No firm single-component conclusion has come from human clinical research yet.
Current work runs three lines: the fatty oil and active components on respiratory smooth muscle — some components relax spasmed muscle, possibly easing cough and wheeze; antioxidant activity — vitamin E and related materials; and gut movement — some animal experiments show the seed promotes intestinal motion, possibly tied to the traditional bowel-moistening reading. Most of this is still basic-stage; human verification is needed.
Nature and flavor: Chao Zi Su Zi is warm and acrid, entering the Lung and Large Intestine — moistening, without over-draining the upright qi; Chao Lai Fu Zi is neutral, acrid and sweet, entering the Lung, Spleen, and Stomach — a digesting edge, moving stuck food, with no clear warming or moistening bias. Focus: Chao Zi Su Zi descends lung qi, transforms phlegm, and moistens the bowel — rebellious qi and dry intestines; Chao Lai Fu Zi digests food, moves stagnation, and transforms phlegm — stuck food and phlegm-damp cough, centered on the spleen-stomach. Tendency: Chao Zi Su Zi works on the Lung and Large Intestine — descending with moisture, gentle on qi; Chao Lai Fu Zi works on the Lung, Spleen, and Stomach — digesting and guiding stagnation, with a draining edge that can drain upright qi if used long. Best fit: Chao Zi Su Zi for cough and wheeze with dry stools and no food stagnation; Chao Lai Fu Zi for post-meal bloating and belching with cough and much phlegm. Who should avoid: Chao Zi Su Zi is wrong for lung-heat cough and spleen-deficiency loose stools; Chao Lai Fu Zi is wrong for qi deficiency without food stagnation — weak, easily tired bodies with no bloating. Where you meet them: Chao Zi Su Zi in lung-and-gut formulas and food remedies — cough with constipation; Chao Lai Fu Zi in spleen-stomach digestion formulas — food stagnation and bloating.
In short, Chao Zi Su Zi descends lung qi and moistens the bowel; Chao Lai Fu Zi digests stagnation and transforms phlegm-damp. Both can appear in phlegm-damp cough care — but they are not stand-ins for each other.
A formula is a coordinated team; a single herb cannot copy a full formula's effect. The doses and pairings are designed as a whole — a herb that works in a formula does not automatically work the same way alone. Do not self-formulate from web articles — classic formulas especially need a practitioner's pattern-based adjustment of pairing and dose.
Example 1 — Su Zi bowel-moistening tea: Chao Zi Su Zi 3 g, Huo Ma Ren 2 g, green tea 1 g — crush the first two lightly, steep all in boiling water 10 minutes. Fit: autumn-winter dry, hard stools in a drier body without marked cold signs. Not for: spleen-deficiency loose stools, frequent diarrhea. Frequency: 1–2 times a week, not long-term. Example 2 — Su Zi cough tea: Chao Zi Su Zi 2 g, Bai Qian 2 g, fresh ginger 1 slice — crush the first two lightly, steep all 15 minutes. Fit: mild autumn-winter cough from external cold — cough, thin white phlegm, no marked fever. Not for: lung-heat cough with yellow phlegm. Frequency: 2–3 times a week, no more than 3 days per course. Chao Zi Su Zi is a medicinal piece, not ordinary food — do not use it like kitchen perilla leaves.
The raw seed leans to moistening the bowel; the stir-fried seed leans to sending qi down and transforming phlegm, with a fuller aroma and a gentler nature — the daily-care form. At home, no first, last, or wrapped handling — decoct it with the other herbs; crushing it first releases the active oils more easily. Different forms cannot be converted directly — a piece dose is not a formula-extract dose.
The classic range is 5–10 g; food-use amounts are 2–5 g. The two are not interchangeable. Not for long continuous use — a course of 3–5 days for cough or constipation; stop once eased. The elderly and children ask a practitioner or pharmacist to adjust the dose first.
Lung-heat cough — yellow phlegm, dry mouth, fever; spleen-deficiency loose stools — frequent thin stools; pregnancy and nursing — consult a practitioner first; children and the elderly — lower tolerance, no self-use; liver or kidney impairment — practitioner-guided use; allergy to perilla or mint-family plants — avoid; people on anticoagulant, blood-pressure, or blood-sugar regimens — no casual self-use.
No clear interactions with common medicines are reported, but anyone on anticoagulants, blood-pressure, blood-sugar, or sedative medicines should ask a doctor or pharmacist first. No blanket "food clash" with ordinary foods is established, but herbs can interact with specific medicines — if taking other medicines, space them 1–2 hours apart.
Reactions are few, but overuse can bring nausea, vomiting, and diarrhea; some allergic bodies may get a rash and itching. Stop and seek care at once for marked discomfort, an allergic reaction, persistent vomiting, trouble breathing, confusion, or a rapid worsening of symptoms.
Nong's Chao Zi Su Zi (Fried Perilla Seed) Single Herb 5:1 Concentrated Granules
$53.68
Hoi Tin San Zi Yang Qin Tang (Three Seeds Nourish One's Parents Decoction) 5:1 Concentrated Granules
$26.32
Nong's San Zi Yang Qin Tang (Three Seeds Nourish One's Parents Decoction) 5:1 Concentrated Granules
$53.39
Han's San Zi Yang Qin Tang (Three Seeds Nourishing the Parents Decoction) 5:1 Concentrated Granules
$56.07
Hoi Tin Su Zi Jiang Qi Tang (Perilla Seed Decoction to Direct Qi Downward) 5:1 Concentrated Granules
$24.93
Nong's Su Zi Jiang Qi Tang (Perilla Seed Decoction to Direct Qi Downward) 5:1 Concentrated Granules
$44.83
Han's Su Zi Jiang Qi Tang (Perilla Fruit & Descending Qi Decoction) 5:1 Concentrated Granules
$47.08
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.
