Phlegm-Resolving Formulas

三子養親湯 · Sān Zǐ Yǎng Qīn Tāng

San Zi Yang Qin Tang

A classical simple formula for elderly patients with phlegm-damp cough, wheezing and food stagnation.

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Last reviewed August 2026

Formula CategoryPhlegm-Resolving Formulas

Primary PatternPhlegm-Dampness

Primary FunctionDirect Qi down, resolve phlegm, promote digestion

Primary Therapeutic PrincipleDescend rebellious Qi, transform phlegm and resolve food stagnation

Main HerbsWhite Mustard Seed · Perilla Fruit · Radish Seed

Classical SourceClassical TCM formulary

Why This Formula?

Traditionally selected for elderly patients with phlegm-damp cough and food stagnation, when a simple descending and digesting approach is preferred.

Overview

What Is San Zi Yang Qin Tang?

1. Legend of Origin

San Zi Yang Qin Tang (三子养亲汤), or Three-Seed Decoction to Nourish One’s Parents, is a classical Ming-dynasty formula from Han Mao’s Han Shi Yi Tong (Han’s Comprehensive Medicine). It belongs to the category of formulas that descend Qi, transform Phlegm, and promote digestion.

This simple three-seed formula addresses Phlegm and food stagnation clogging the Lungs and Middle Burner, a pattern especially common in the elderly—hence the name “to nourish one’s parents.” Typical signs include cough and wheezing with copious white phlegm, chest and epigastric fullness, poor appetite, a greasy white tongue coating, and a slippery pulse.

Combining Bai Jie Zi to warm and transform cold Phlegm and open the Lungs, Su Zi to descend rebellious Lung Qi and stop wheezing, and Lai Fu Zi to reduce food stagnation, descend Qi, and transform Phlegm, San Zi Yang Qin Tang effectively moves stagnant Qi, resolves Phlegm, and restores comfortable breathing and digestion without heavy tonification.

2. Application in Respiratory System Disorders

San Zi Yang Qin Tang is a highly popular choice for chronic respiratory issues, especially for elderly patients whose digestive systems have weakened over time.

Target Conditions: It is commonly used for chronic bronchitis and emphysema when patients experience coughing, wheezing, chest heaviness, and lots of white phlegm.
How It Helps: By clearing the airways and reducing phlegm production, it significantly improves breathing. At the same time, boosting the digestive system helps the patient regain their overall strength and natural resistance.

3. Application in Digestive System Disorders

Because of its strong ability to move stagnant food, this formula is also a great tool for purely digestive complaints.

Target Conditions: It works wonderfully for seniors who experience sudden bloating, indigestion, or a loss of appetite after eating even just a little bit.
How It Helps: Lai Fu Zi quickly gets the stomach and intestines moving again, relieving the uncomfortable bloating and helping the body digest and absorb nutrients properly.

San Zi Yang Qin Tang: Descending Qi, Dispersing Food Stagnation, Resolving Phlegm and Calming Wheezing — Precise Conditioning for Chronic Bronchitis, Stubborn Cough, and Functional Dyspepsia | HJMEDICAL

4. Other Indications

In Traditional Chinese Medicine, "phlegm" isn't just something you cough up; it is considered a sticky, heavy pathogen that can travel and block energy channels anywhere in the body.

Joint Pain and Numbness: If phlegm blocks the meridians (energy channels) and restricts blood flow, it can cause numb limbs or aching joints. This formula helps melt that blockages away to relieve the pain.
Headaches and Dizziness: Sometimes, internal phlegm buildup combined with poor digestion can cause the head to feel heavy, dizzy, or painful. By clearing the phlegm and fixing the digestion, this formula can help clear the head as well.

How It Works

Herb Composition (Sovereign / Minister / Assistant / Envoy)

1. Chief Herb — Lai Fu Zi

Lai Fu Zi (Radish Seed) is the seed of the radish plant. It is acrid and sweet in flavor, neutral in nature, and enters the lung, spleen, and stomach channels.

Key Actions: It is excellent at digesting food buildup to relieve bloating and descending qi to resolve phlegm.
Role in the Formula: In San Zi Yang Qin Tang, it takes the lead. For digestive issues like bloating and acid reflux, it clears stomach and intestinal stagnation. For respiratory issues, it pushes down "turbid phlegm," making it much easier to cough up and relieving wheezing.
Usage Notes: Because of its strong, dispersing nature, the dosage is carefully adjusted based on the severity of the patient's condition.

2. Deputy Herb — Bai Jie Zi

Bai Jie Zi (White Mustard Seed) is acrid in flavor, warm in nature, and primarily targets the lung channel.

Key Actions: It focuses on warming the lungs to clear cold phlegm and moving qi to disperse nodules.
Role in the Formula: It assists Lai Fu Zi by powerfully warming and dissolving cold, watery phlegm that blocks the airways. It also helps relieve body aches or joint numbness caused by phlegm blocking the body's channels.
Usage Notes: Because it is quite warm and strong, practitioners avoid using too much to prevent drying out the body's natural fluids (Yin).

3. Assistant Herb — Su Zi

Su Zi (Perilla Seed) is acrid in flavor, warm in nature, and enters the lung and large intestine channels.

Key Actions: It directs qi downward to stop coughing and wheezing, while also moistening the intestines to promote smooth bowel movements.
Role in the Formula: It works alongside the other seeds to calm rebellious lung qi (which causes coughing). Crucially, its moistening oil content prevents the formula from becoming too drying, ensuring that digestion and bowel movements stay regular.

4. Envoy Herb — Gan Cao

While not always explicitly listed as the envoy in every classical text, Gan Cao (Licorice Root) naturally fulfills the role of harmonizing the formula.

Key Actions: It is sweet and neutral, known for boosting spleen qi, moistening the lungs, and harmonizing other herbs.
Role in the Formula: It smooths out the strong, potentially harsh effects of the three seeds, ensuring they work together without conflict. It also strengthens the digestive system, helping the body properly absorb the medicine.

Symptoms Traditionally Associated

Clinical Presentation in TCM

1. Pathomechanism Analysis

The core issue San Zi Yang Qin Tang treats is phlegm buildup combined with rebellious lung qi, which is especially common as we age.

The Root Cause: As people get older, their digestive system (spleen and stomach) weakens. Food sits longer and turns into "turbid phlegm."
The Vicious Cycle: This phlegm moves up and blocks the lungs, preventing normal breathing and causing a chronic cough or wheezing. External cold weather can easily trigger or worsen this cycle.

2. Actions

This formula uses a three-pronged approach to restore balance:

Warms the Lungs & Resolves Phlegm: It melts away cold phlegm, opening up the airways.
Descends Qi: It stops the "upward rebellion" of lung qi, naturally calming coughs and wheezing.
Disperses Food Buildup: It treats the root cause by improving digestion, stopping the body from generating more phlegm in the first place.

3. Indications

San Zi Yang Qin Tang is highly effective for patterns of phlegm obstruction with food stagnation.

Common Symptoms: Coughing and wheezing, a feeling of heavy chest oppression from excess phlegm, poor appetite, indigestion, a white greasy coating on the tongue, and a slippery pulse.
Target Audience: It is exceptionally well-suited for elderly patients. Because aging naturally weakens digestion and makes seniors prone to chronic phlegm and coughs, this gentle, seed-based formula provides highly effective, targeted relief.

Formula Analysis

The Mechanism in Classical Theory

1. Combination for Resolving Phlegm and Descending Qi

The three seeds—Lai Fu Zi (Radish Seed), Bai Jie Zi (White Mustard Seed), and Su Zi (Perilla Seed)—team up to effectively clear out phlegm and push rebellious qi back down.

The Strategy: Lai Fu Zi focuses on digesting food to cut off the source of new phlegm, while also pushing qi downward. Bai Jie Zi warms the lungs to melt away stubborn cold phlegm. Finally, Su Zi calms wheezing and stops the cough.
The Result: By attacking the problem from these different angles, the formula concentrates its power to provide fast and effective relief for heavy phlegm and severe coughing.

2. Synergy Between Warming the Lung and Dispersing Food Accumulation

This formula brilliantly combines warming the lungs with boosting digestion, treating both the symptoms and the root cause at the same time.

Symptom Relief: The warming nature of Bai Jie Zi clears the immediate cold phlegm from the lungs, opening up the airways so you can breathe easier.
Root Cause Treatment: Meanwhile, Lai Fu Zi breaks down stagnant food in the stomach. In Traditional Chinese Medicine, poor digestion is a primary source of "turbid phlegm." By fixing the digestion, the formula stops the body from generating more phlegm, helping to prevent the cough from coming back.

3. Complementary Herb Characteristics

The specific traits of these three seeds perfectly balance each other out to make a highly effective and safe formula.

Strong and Penetrating: The sharp, dispersing energy of Lai Fu Zi pairs with the deep-reaching warmth of Bai Jie Zi to powerfully break up phlegm and unblock the body's channels.
Gentle and Moistening: Because the first two herbs can be a bit warming and drying, the naturally oily Su Zi steps in. Its moistening properties protect the body's natural fluids and keep the intestines lubricated, ensuring the whole formula remains gentle and well-tolerated.

How This Formula Compares

Clinical Comparison Table

Compare	San Zi Yang Qin Tang	Su Zi Jiang Qi Tang	Er Chen Tang	Ding Chuan Tang
Primary Function	Direct Qi down, resolve phlegm, promote digestion	Direct rebellious Qi down, resolve phlegm, stop wheezing	Dry dampness, resolve phlegm, regulate Qi, harmonize middle	Diffuse Lung, direct Qi down, clear heat, resolve phlegm, calm wheezing
Formula Category	Phlegm-Resolving Formulas	Qi-Regulating Formulas	Phlegm-Resolving Formulas	Exterior-Releasing Formulas
Typical TCM Pattern	Phlegm-Dampness	Phlegm-Dampness	Phlegm-Dampness	Phlegm-Heat
Main Conditions	Asthma & Wheezing, Poor Appetite	Asthma & Wheezing, Chest Tightness	Poor Appetite, Nausea	Asthma & Wheezing, Cough
Main Herbs	White Mustard Seed · Perilla Fruit · Radish Seed	Perilla Fruit · Pinellia Rhizome · Chinese Angelica Root · Licorice Root · Magnolia Bark · Peucedanum Root · Cinnamon Bark	Pinellia Rhizome · Tangerine Peel · Poria / Hoelen · Honey-fried Licorice	Ginkgo Seed · Ephedra Herb · Perilla Fruit · Licorice Root · Coltsfoot Flower · Bitter Apricot Kernel · Mulberry Root Bark · Scutellaria / Baikal Skullcap · Pinellia Rhizome
Classical Source	Classical TCM formulary	Tai Ping Hui Min He Ji Ju Fang (Song, 1107)	Tai Ping Hui Min He Ji Ju Fang (Song, 1107)	Ming-Qing classical formulary

How to tell them apart

San Zi Yang Qin Tang, Su Zi Jiang Qi Tang, Er Chen Tang and Ding Chuan Tang address phlegm cough or wheezing. Su Zi Jiang Qi Tang descends upper excess with lower deficiency; Er Chen Tang is plain phlegm-damp; Ding Chuan Tang is exterior cold with interior phlegm-heat. San Zi Yang Qin Tang is a simple three-seed formula for elderly patients with phlegm-damp cough, wheezing and food stagnation.

For educational reference only, based on traditional pattern differentiation — not a substitute for professional advice.

Clinical Modifications

Clinical Modifications for San Zi Yang Qin Tang

1. More Severe Cough

When a patient has a particularly stubborn or severe cough, practitioners often add Zi Wan (Aster Root) and Kuan Dong Hua (Coltsfoot Flower) to the base formula.

How it Works: Both of these herbs are excellent at moistening the lungs and pushing lung qi downward.
The Benefit: By working together with San Zi Yang Qin Tang, they make it much easier for the patient to cough up trapped phlegm, providing stronger and faster relief from coughing.

2. Pronounced Wheezing

If loud wheezing or heavy breathing is the main issue, Ma Huang (Ephedra) and Xing Ren (Apricot Kernel) are commonly added.

How it Works: Ma Huang is highly effective at opening up the lungs and airways, while Xing Ren pushes lung qi down and moistens the intestines.
The Benefit: This combination rapidly relaxes the airways and relieves bronchial spasms, making it much easier to breathe smoothly.

3. Profuse, Yellow Phlegm Attributable to Hot Phlegm

The original formula is warm, so if the patient has "hot phlegm" (indicated by thick, yellow phlegm), cooling herbs like Huang Qin (Baikal Skullcap Root) and Gua Lou (Trichosanthes Fruit) are introduced.

How it Works: Huang Qin clears out internal heat and dries up dampness, while Gua Lou clears heat, thins the sticky phlegm, and opens up the chest.
The Benefit: This adjustment cools the lungs, making thick yellow phlegm much easier to expel and relieving the feeling of a tight, stuffy chest.

4. More Severe Food Accumulation

If the patient's digestive blockage is very severe, Shen Qu (Medicated Leaven) and Shan Zha (Hawthorn Fruit) can be added to support Lai Fu Zi (Radish Seed).

How it Works: Shen Qu is great for general indigestion and stomach harmony, while Shan Zha is especially famous for breaking down heavy, rich foods and meats.
The Benefit: This powerful digestive trio works synergistically to quickly eliminate severe bloating, gas, and loss of appetite.

Modern Research

What the Science Suggests

1. Pharmacological Research

Modern science has uncovered how the specific herbs in San Zi Yang Qin Tang work on a biological level:

Better Digestion: Lai Fu Zi (Radish Seed) is rich in volatile oils that stimulate gastrointestinal muscles, speeding up digestion and clearing blockages.
Clearing Phlegm: The active compounds in Bai Jie Zi (White Mustard Seed) gently stimulate the respiratory lining. This increases secretions, which actually thins out thick mucus and makes it easier to cough up.
Calming Wheezing: Su Zi (Perilla Seed) contains specialized oils that help relax the smooth muscles of the bronchial tubes, easing wheezing and spasms.
Immune Support: The formula as a whole has been shown to help regulate and boost the body's natural immune defenses.

2. Verification of Clinical Efficacy

Clinical studies have consistently backed up the traditional uses of San Zi Yang Qin Tang:

Respiratory Relief: Studies on patients with chronic bronchitis show that the formula significantly reduces coughing and wheezing while improving overall lung function. It also helps lower inflammatory markers in the airways.
Digestive Health: It is proven to speed up stomach emptying and improve intestinal movement, providing reliable relief for bloating and indigestion.
Quality of Life: Beyond digestion and breathing, it has shown positive results in treating dizziness and headaches linked to "phlegm-turbidity," helping patients feel more energized.

3. Safety Research

Modern safety evaluations confirm that San Zi Yang Qin Tang is very well-tolerated when used correctly:

General Safety: At standard clinical dosages, the formula has a strong safety profile with very few adverse reactions.
Long-Term Use: Observations suggest that proper, long-term use does not cause obvious harm to liver or kidney function.
Precautions: Because it is a warming and moving formula, practitioners still exercise caution when prescribing it to patients with very weak constitutions or "deficiency-cold" in the digestive system.

Safety

Safety Considerations

1. Dietary Precautions

While taking San Zi Yang Qin Tang, avoid spicy, greasy, raw, cold, overly sweet, and rich foods, as they may burden the spleen and stomach, impair digestion, and worsen phlegm-dampness.

2. Constitutional and Special-Population Precautions

Use San Zi Yang Qin Tang cautiously if you are frail or have spleen–stomach deficiency-cold, as its warming, drying, and dispersing properties may worsen deficiency, abdominal discomfort, or diarrhoea. It should generally be avoided during pregnancy. Older adults and children should use it only under medical supervision, with dosage adjusted for their condition, age, and weight.

Available Products

Where to Get It

HJMEDICAL Hoi Tin San Zi Yang Qin Tang (Three Seed Decoction to Nourish One's Parents) 5:1 Concentrated Granules $26.32

Nong's San Zi Yang Qin Tang Extract Granules

HJMEDICAL Nong's San Zi Yang Qin Tang (Three Seeds Nourishing the Parents) 5:1 Concentrated Granules $53.39

Hoi Tin Su Zi Jiang Qi Tang Extract Granules

HJMEDICAL Hoi Tin Su Zi Jiang Qi Tang (Perilla Seed Decoction) 5:1 Concentrated Granules $24.93

Nong's Su Zi Jiang Qi Tang Extract Granules

HJMEDICAL Nong's Su Zi Jiang Qi Tang (Perilla Seed Decoction to Direct Qi Downward) 5:1 Concentrated Granules $44.83

HJMEDICAL Hoi Tin Er Chen Tang (Two Aged Ingredients Decoction) 5:1 Concentrated Granules $29.10

HJMEDICAL Nong's Er Chen Tang (Two Aged Decoction) 5:1 Concentrated Granules $51.25

Hoi Tin Ding Chuan Tang Extract Granules

HJMEDICAL Hoi Tin Ding Chuan Tang (Calm the Wheezing Decoction) 5:1 Concentrated Granules $26.32

HJMEDICAL Nong's Ding Chuan Tang (Arrest Wheezing Decoction) 5:1 Concentrated Granules $65.16

FAQ

Questions About San Zi Yang Qin Tang

Q1: What are the actions of San Zi Yang Qin Tang?

San Zi Yang Qin Tang has the actions of directing Qi downward, transforming Phlegm, and reducing food accumulation. Its name means a decoction that “nourishes the parents”: it was designed for elderly people whose Spleen is weak and whose Lung Qi rebels with copious Phlegm.

Q2: Which modern diseases is San Zi Yang Qin Tang suited to?

Modern TCM clinical practice commonly applies it to individuals whose pattern differentiation falls within Phlegm and rebellious Qi from weak digestion, including chronic bronchitis or elderly cough with copious white Phlegm, wheezing with chest fullness after meals, and poor appetite with food sitting in the Stomach and generating Phlegm.

Q3: Is San Zi Yang Qin Tang suitable for improving cough with a lot of Phlegm and a tight full chest?

For presentations of cough or mild wheeze, copious Phlegm that is easy or moderately easy to expectorate, chest and epigastric fullness, reduced appetite, a greasy coating, and a slippery pulse — in those whose pattern differentiation confirms Phlegm and Qi rebellion — TCM commonly applies San Zi Yang Qin Tang as an adjunct. It cannot replace evaluation of COPD exacerbation, heart failure, or pneumonia.

Q4: Who should not take San Zi Yang Qin Tang?

Those with dry Yin-deficiency cough and little sputum, Phlegm-Heat with thick yellow sputum and high fever, or Qi deficiency so marked that strong descending would further deplete the person are generally not suitable as a standalone formula. The three seeds are dispersing and descending. Use should be assessed by a qualified TCM physician.

Q5: What does each of the three seeds do?

Su Zi descends Lung Qi and transforms Phlegm to stop cough and wheeze. Bai Jie Zi warms and transforms Cold-Phlegm in the chest and opens the channels of the upper body. Lai Fu Zi reduces food accumulation, directs Qi downward, and also transforms Phlegm so that food stagnation does not keep generating more Phlegm. Together they treat the branch (Phlegm-Qi in the chest) that comes from a weak elderly Spleen.

Q6: How does San Zi Yang Qin Tang differ from Er Chen Tang or Ding Chuan Tang?

Er Chen Tang is the basic formula for Spleen Damp-Phlegm and is less focused on descending the Lung and reducing food stagnation. Ding Chuan Tang treats more intense wheezing with both Wind-Cold and interior Phlegm-Heat. San Zi Yang Qin Tang is a small, practical formula for elderly Phlegm-Qi accumulation with fullness after eating; it is often added to a Spleen-supporting base rather than used as a complete long-term tonic.

Q7: What are the main ingredients of San Zi Yang Qin Tang?

The classical three-ingredient formula consists of Su Zi (perilla seed) to descend Lung Qi and transform Phlegm; Bai Jie Zi (white mustard seed) to warm and transform Phlegm in the chest; and Lai Fu Zi (radish seed) to reduce food accumulation and help transform Phlegm. The seeds are often dry-fried and crushed before decoction.

Q8: Is San Zi Yang Qin Tang suitable for long-term use?

No. It is a short-course formula that treats the branch of Phlegm and rebellious Qi. Prolonged descending and dispersing can consume Qi. Once cough and fullness ease, treatment should shift toward strengthening the Spleen so Phlegm is not continually generated.

Q9: Can this formula help both the phlegmy cough and the feeling that food sits in the stomach?

Yes. That pairing is a classical reason for choosing the three seeds together. Food that the elderly Spleen cannot transform becomes Phlegm; Phlegm then occupies the chest and the Lung cannot descend. Reducing accumulation and descending Qi treat both complaints of one pattern.

Q10: What lifestyle advice supports the use of San Zi Yang Qin Tang?

Eating smaller warm cooked meals, reducing greasy and hard-to-digest food, sitting upright after eating, and not treating this small formula as a substitute for medical care of breathlessness all support correct use. Sudden worsening wheeze, fever, or swelling of the legs requires prompt evaluation.

FAQ

General Questions

How do I choose the right formula?

TCM formulas are traditionally selected according to individual pattern differentiation rather than by symptom alone. If you're not sure which formula fits your presentation, take our AI Assessment below for a personalized starting point, then confirm with a qualified TCM practitioner.

What are concentrated herbal granules?

Concentrated herbal granules are made by decocting raw herbs, then extracting and concentrating the resulting liquid into a fine granule or powder form. This preserves the same active compounds as a traditional decoction while making the herbs far easier to store, measure, and prepare.

How should I take these products?

Dissolve the recommended amount of granules in hot water, stir until fully dissolved, and drink while warm — following the dosage and frequency advised by your TCM practitioner or as stated on the product packaging.

Are concentrated herbal granules equivalent to traditional decoctions?

Concentrated granules are produced from the same herbs and processed to retain their active compounds, so they are traditionally regarded as a convenient alternative to decoctions rather than a different remedy. Some practitioners note subtle differences in strength or absorption between the two forms, so your TCM practitioner may adjust dosage accordingly.

Are your products authentic?

Yes. HJMEDICAL sources its concentrated granules exclusively from established, reputable manufacturers such as Nong's and Hoi Tin, both long-standing names in the TCM granules industry, with GMP compliance stated directly on their packaging.

Are HJMEDICAL products manufactured under GMP standards?

HJMEDICAL sources its concentrated granules from established, reputable manufacturers such as Nong's and Hoi Tin, both long-standing names in the TCM granules industry. GMP compliance for these products is stated directly on their packaging.

Do you ship internationally?

Yes — we ship worldwide! Every order goes out via Hong Kong Post, and your exact shipping cost and estimated delivery time for your address are calculated and shown right at checkout, so there are never any surprises. We also offer free shipping once your order reaches our free-shipping threshold, so it's easy to stock up on your favorite formulas and save.

Can I take more than one formula at the same time?

Some formulas are traditionally combined, while others overlap or counteract each other. We recommend checking with a qualified TCM practitioner before combining formulas, especially if you are already taking other medication.

Are these products suitable during pregnancy or breastfeeding?

Some TCM formulas are not suitable during pregnancy or breastfeeding. Please consult a qualified TCM practitioner or your doctor before use if you are pregnant, trying to conceive, or nursing.

Do these products replace medical treatment?

No. These products are traditional herbal supplements intended to support wellbeing according to TCM principles — they are not a replacement for professional medical diagnosis or treatment. Please consult a qualified TCM practitioner or licensed healthcare provider before starting, stopping, or combining any treatment, especially if you have a chronic condition.

Medical Disclaimer

For general TCM education only — not medical advice. Consult a qualified TCM practitioner or licensed healthcare provider before use, especially if pregnant, nursing, on medication, or managing a chronic condition.

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