Whole herbsTonifyingCynomorii Herba

Suo Yang (Songaria Cynomorium Herb)

A practical guide to Suo Yang: 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 29, 2026

Quick Facts

Latin NameCynomorii Herba
Chinese Name & Pinyin 鎖陽 · Suo Yang
Medicinal PartWhole herbs
The itemSuo Yang is the dried fleshy stem of the parasitic Cynomorium songaricum, raw or wine-prepared. Rou Cong Rong is not this drug. It usually goes into decoctions and pills, and is also steeped as a seasonal tea.
Nature and channelsWarm, sweet. Enters the Liver and Kidney. Warm and sweet warm the kidney, assist yang, moisten the intestines, and free the stool.
Pharmacopoeia lineWarms the kidney and assists yang. Moistens the intestines and frees the stool. Used for kidney-yang deficiency with cold sore knees, chills, and yang-deficiency dry-bound stool.
Pattern cuesCold sore lower back and knees. Chills and cold limbs. Low spirits. Dry-bound stool with weak push.
In this articleSuo Yang versus Rou Cong Rong. Warming the kidney versus moistening the intestines. Why yin deficiency with fire should skip it. Why excess-heat constipation is a poor match. Who should not steep it daily on their own.

What Is Suo Yang?

Suo Yang (锁阳; Suǒ Yáng; Latin: Cynomorii Caulis; English: cynomorium) in the current pharmacopoeia is the dried fleshy stem of Cynomorium songaricum, a brown parasitic fleshy herb of the Gobi, dug in spring or autumn; the sand-scorched or wine-prepared slice is also common. It is warm and sweet, enters the Liver and Kidney channels, and its core actions are to warm the kidney and assist yang, and to moisten the intestines and free the stool. It usually goes into decoctions and pills, and it is also steeped as a seasonal warming tea in folk practice. The usual amount is 5–10 g. The raw stem is firm and is cooked a little longer before the other herbs go in. It is not a daily food on its own; a mild tea with Gou Qi and red dates is the seasonal support form.

It is not Rou Cong Rong. Cistanche is warm, sweet, and salty, moist and rich, leaning toward moistening the intestines and nourishing essence; Suo Yang is warmer and drier, leaning harder on warming the kidney and moving the stool. Yin deficiency with fire, with hot palms, tidal heat, and night sweats, is a poor match, and so is excess-heat constipation with bad breath and mouth sores. Use caution in pregnancy.

It is used most often for three patterns:

  • Kidney-yang deficiency: cold sore lower back and knees, chills, cold hands and feet, low spirits
  • Yang-deficiency constipation: dry-bound stool with chills and cold limbs, weak push
  • Mild seasonal autumn-winter warming, steeped as a light tea under guidance

Warm and sweet, it is not a daily “energy or warming tonic” to keep increasing. Warming when there is already fire dries the yin and flares the heat.

When kidney yang runs low, cold sore knees, chills, and weak intestinal push follow, so the stool goes dry and hard. Suo Yang is warm and sweet. It warms while it moistens, which is why it appears in Jin Gang Wan (Jin-Gang Pill)–type formulas. It warms more than it moistens. Yin deficiency with fire, with no cold yang, gets worse if more is added.

Suo Yang is not a catch-all energy or warming tonic. In yin deficiency with fire, with no cold yang, or in pregnancy, using it alone is a poor match. Raw or wine-prepared, and whether it belongs in a formula, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Suo Yang

Suo Yang: Materia Medica Profile

Identification & Quality Standard

Cynomorii Herba

Botanical Origin

The dried fleshy stem of Cynomorium songaricum Rupr.(Cynomoriaceae).

Production Regions

Primarily produced in the Chinese provinces of Inner Mongolia, Ningxia, Xinjiang, Gansu.

Quality Requirements

Superior medicinal material is fat and large, red, firm, with powdery fractured surface and indistinct veins.

Macroscopic Features

Flat cylindrical shape or has one slightly thin end, 8~21cm long, 2~5cm diameter. Externally reddish-brown to dark brown, wrinkled, creating thick and large grooves or irregular impressions, sometimes can see triangular scales, and some remnants of inflorescence. Hard texture, hard to break, fractured surface is slightly granular, brown, soft and moistened. faintly aromatic odor, slightly bitter and astringent taste. Suo yang slices are horizontally cut or angular cut thick slices, about 1cm thick, often bound.

Main Regions and Quality Identification

Traditional materia medica and industry experience value the northwest regions — Inner Mongolia, Gansu, and Qinghai — but actual quality also depends on variety, harvest time, processing, and storage. In appearance, good-quality raw Suo Yang is flat-cylindrical, brown on the surface with obvious longitudinal grooves and irregular depressions, firm in texture, with a light-brown cross-section bearing fine, dense vascular-bundle dots, a faint odor, and a sweet-astringent taste. The processed form is mostly irregular thick slices — crisper and somewhat darker. The common look-alikes are stem sections of closely related plants — with shallower surface texture, sparser vascular bundles on the cross-section, and a fainter odor.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Sweet; WarmLiverKidneyLarge Intestine

1. Records in Classic Materia Medica

  • Shen Nong Ben Cao Jing: lists Suo Yang as upper grade — "mainly treats five strains and seven injuries, tonifies essence-blood, boosts yang qi, and benefits the stool."
  • Ming Yi Bie Lu: adds that it "mainly treats insufficiency of yin qi and cold-pain of the lower-back and knees."
  • Xin Xiu Ben Cao: says it can "moisten dryness, nourish the sinews, and treat flaccidity weakness."
  • Ben Cao Gang Mu: further states it "greatly tonifies yin qi, boosts essence-blood, and benefits the stool — those with deficiency and dry-bound stool may eat it in place of Rou Cong Rong."
  • De Pei Ben Cao: stresses that it "tonifies yang without dryness and nourishes without greasiness."
  • Zhong Hua Ben Cao: summarizes the records of past generations — its actions being tonifying the kidney and strengthening yang, and moistening the intestines and freeing the stool.

2. How Views of Its Nature Changed

Views among physicians differ somewhat. Some stress its warming and tonifying yang action, mostly used to improve the cold-pain lower-back knees and fear of cold from kidney-yang insufficiency; others emphasize its moistening-intestine action, holding that it tonifies without being harsh — fitting people with yang deficiency plus dry-intestine constipation; still others clearly point out that its scope is limited — not for yin-deficiency fire-flaring or excess-heat constipation, to avoid triggering "fire" symptoms through misuse.

Suo Yang

Core Efficacies & Traditional Applications

Traditional Functions

Supplements kidney yang, benefits essence and blood, and moistens intestines to free stools.

1. First Direction: Tonifying the Kidney and Assisting Yang

  • Traditional action: supplement kidney yang and improve the state of yang-qi insufficiency.
  • Typical signs: cold-pain lower-back and knees, fear of cold, cold hands and feet, and low spirits — such people mostly have yang qi damaged by long-term irregular routine, overwork, or cold diet.
  • Usual combinations: often paired with kidney-warming herbs — such as Rou Cong Rong and Ba Ji Tian — to strengthen the warming-tonic effect.
  • Who should not self-use: those with yin-deficiency fire-flaring — dry mouth and tongue, hot hands and feet, tidal heat and night sweats — because Suo Yang may worsen the "fire" symptoms.

2. Second Direction: Moistening the Intestines and Freeing the Stool

  • Traditional action: warm and moisten the intestines and help improve the condition of dry, bound stool.
  • Typical signs: the yang-deficient type of constipation — not simple intestinal dryness, but constipation from yang insufficiency leaving the intestines without pushing power — often with fear of cold and cold hands and feet.
  • Usual combinations: often paired with intestine-moistening herbs — such as Huo Ma Ren and Yu Li Ren — to warm and moisten the intestines while also helping push the intestinal qi.
  • Who should not self-use: those with excess-heat constipation — dry, bound stool, bad breath, and mouth sores — because Suo Yang may worsen the heat evil.

3. Classic Pairing: Suo Yang With Rou Cong Rong

Suo Yang with Rou Cong Rong is a common pair. Both tonify the kidney and assist yang, and both moisten the intestines and free the stool; combined, they mutually strengthen the warming-tonic and intestine-moistening effects — a synergistic pair — fitting the traditional patterns of yang deficiency with constipation, such as middle-aged and older yang-deficient constipation and postpartum blood-yang-deficient constipation. This pair needs the physician's pattern diagnosis — adjust the dose and other combined herbs according to the specific pattern; do not pair casually on your own.

Suo Yang

Modern Research

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

1. Main Chemical Constituents

Modern studies show that the main constituents detected in Suo Yang include flavonoids, terpenoids, polysaccharides, amino acids, and minerals. In in vitro experiments, some of the flavonoid constituents showed a certain antioxidant action; in animal experiments, feeding the Suo Yang extract to kidney-yang-deficiency model mice showed increased activity and a slight recovery of body temperature. A systematic human clinical study of Suo Yang has not yet been completed.

2. Current Research Directions

Current research on Suo Yang mainly focuses on two directions:

  • Its influence on metabolism — animal experiments show that the polysaccharide constituents may promote intestinal peristalsis to a certain extent.
  • Its regulation of intestinal function — experiments observed that the extract can scavenge some free radicals in vitro.

Such results only represent the action in the laboratory environment. More human research is still needed to verify Suo Yang's effect and safety in actual use.

3. Limitations of Current Research

  • Lab results are not clinical efficacy — the observations of in vitro and animal experiments cannot be directly applied to humans.
  • Extracts and monomers are not the same as traditional decoction pieces — the high-concentration extracts used in experiments differ greatly from the slice dose taken in daily use.
  • Sources, preparation methods, and doses vary between studies — this makes the research results hard to compare directly.
  • A single component does not define the whole herb — Suo Yang is a whole in which many constituents act together; a single constituent's activity cannot represent the effect of the whole herb.

Suo Yang

Comparing Similar Herbs

1. What They Share

Choosing Rou Cong Rong as the similar herb, the two share three points:

  • Both have the main action of tonifying the kidney and assisting yang, helping improve the state of kidney-yang insufficiency.
  • Both can be used for the yang-deficient type of constipation — fitting the traditional patterns of fear of cold and cold hands and feet with constipation.
  • Both need constitution and dose considered — those with yin-deficiency fire-flaring should not self-use either.

2. The Key Differences: Suo Yang vs. Rou Cong Rong

  • Nature and flavors: Suo Yang is warm with a sweet flavor — leaning warm with a drier texture; Rou Cong Rong is warm with sweet and salty flavors — leaning warm-moist, with stronger greasy-nourishing quality and weaker warm-dry quality.
  • Focus: Suo Yang leans more toward tonifying the kidney and assisting yang — good at improving the obvious yang-deficiency symptoms of cold-pain lower-back knees and fear of cold; Rou Cong Rong leans more toward moistening the intestines and freeing the stool — good at warm-moistening the intestines and improving the constipation of intestinal dryness, while also tonifying yang.
  • Qi tendency: Suo Yang's action leans sinking-settling — warming and tonifying kidney yang while pushing the intestinal qi downward; Rou Cong Rong's action leans warm-moistening — nourishing the intestines while tonifying essence-blood, gentler in its influence on qi movement.
  • Best fit: Suo Yang fits those with obvious yang-deficiency symptoms — year-round fear of cold, severe cold-pain lower-back knees; Rou Cong Rong fits those with obvious constipation — dry, bound stool and difficult defecation, with signs of essence-blood insufficiency.
  • Not suitable: Suo Yang has a stronger warm-dry quality — those with yin-deficiency fire-flaring and excess-heat constipation should be more cautious; Rou Cong Rong has a stronger greasy-nourishing quality — those with spleen-stomach weakness and poor digestion should not use it long-term in large amounts.
  • Use scenes: Suo Yang often appears in warming-tonic formulas — such as the formulas for yang-deficiency lower-back pain — and in autumn-winter warming tonic food; Rou Cong Rong often appears in intestine-moistening formulas — such as the formulas for elderly constipation — and in food-therapy scenes needing both essence-blood and moisture.

3. One-Sentence Summary

Simply put, Suo Yang leans toward warming and tonifying kidney yang — fitting the cases with obvious yang-deficiency symptoms — whereas Rou Cong Rong leans toward warm-moistening the intestines — fitting the cases with prominent constipation. Both can be used for yang-deficiency-related problems, but they are not interchangeable.

Suo Yang

Classical Formulas Containing Suo Yang

Classic Formula 1: Jin Gang Wan (Jin-Gang Pill)

Combination logic: In Jin Gang Wan, Suo Yang serves as the minister, combined with Du Zhong, Tu Si Zi, and Niu Xi; in the lord-minister-assistant-envoy setup, the lord is Du Zhong and the minister is Suo Yang — the main action being tonifying the kidney and strengthening the lower-back, addressing the weak lower-back knees and limb weakness of kidney-yang insufficiency. Suo Yang works synergistically with the other herbs to strengthen the kidney-tonifying, yang-strengthening effect. Suo Yang alone cannot reach the goal of strengthening the lower-back, because a formula needs several herbs acting together to attend to tonifying the kidney, strengthening the sinews, and firming the bones.

Traditional use: traditionally used for the lower-back and knee pain, flaccid weak lower limbs, and difficulty walking of liver-kidney insufficiency — a common liver-kidney warming-tonic formula.

Modern note: modern clinical use requires a doctor's pattern diagnosis and standard care — do not self-apply just because the formula name relates to a bone disease; a physician must adjust the medication according to the specific pattern.

Classic Formula 2: Suo Yang Gu Jing Wan (Suo-Yang Essence-Securing Pill)

Combination logic: In Suo Yang Gu Jing Wan, Suo Yang serves as the lord, paired with Rou Cong Rong, Ba Ji Tian, and Qian Shi — the main action being tonifying the kidney and securing essence, addressing the nocturnal emission, premature ejaculation, and weak lower-back knees of kidney-yang insufficiency. Suo Yang works synergistically with the other herbs, attending to both tonifying kidney yang and securing kidney essence. Suo Yang alone cannot reach the goal of securing essence, because a formula needs several herbs acting together to strengthen the securing-astringing effect.

Traditional use: traditionally used for the nocturnal emission, spermatorrhea, cold-pain lower-back knees, and low spirits of kidney-yang deficiency with an unsecured essence gate — a common warming-tonic, essence-securing formula.

Modern note: modern clinical use requires a doctor's pattern diagnosis and standard care — do not self-apply just because the formula name relates to male-health conditions; a physician must adjust the medication according to the specific pattern.

Formulas vs. Single Herbs

A formula is a whole in which many herbs act together — through the combination, the biases of the natures are adjusted and different actions are attended to. A single herb cannot simply replicate a full formula's effect, because the doses and combinations in a formula are holistic — the amount and pairing of each herb have been strictly adjusted. The common misunderstanding: a herb that works in a formula means taking it alone produces the same effect — in fact, a single herb's action is limited and cannot reach the formula's synergy. Therefore, do not build formulas from online articles or take a single herb alone to replace a formula.

Diet & Daily Home Use

1. Home Tea and Porridge

Tea — Suo Yang Gou Qi Cha: Suo Yang 5 g, Gou Qi 3 g, Hong Zao 2 pieces. Put all the ingredients into a thermos, steep in boiling water, cover 15 minutes, and drink; can be re-steeped until the taste fades. Suited to daily autumn-winter warming — people with cold hands and feet, fear of cold, and mild constipation. Not for those with yin-deficiency fire-flaring — dry mouth and tongue, hot hands and feet, tidal heat and night sweats. Suggested: 2–3 times a week; do not drink continuously long-term.

2. Decoction and Processing Differences

The raw Suo Yang is firm in texture — extend the decocting time appropriately; it is suggested to pre-boil 15–20 minutes for the active constituents to come out. The processed Suo Yang (sand-scorched or wine-prepared) is crisp in texture — the decocting time can be shortened and no pre-boiling is needed. At home, soak Suo Yang together with the other herbs 30 minutes first, cook the Suo Yang 10 minutes, then add the other herbs, to avoid losing the active constituents. Different forms cannot be converted directly — for example, the Suo Yang dose in tonic food is based on the daily-regulation dose, differing from the medicinal prescription dose; do not increase it casually.

3. Dosage and Course

The common dose in traditional prescriptions is 5–10 g; the food-therapy dose is usually controlled at 3–5 g — somewhat smaller than the medicinal dose. Long-term continuous use is not advised — generally do not take continuously beyond 2 weeks, and you may resume after a 1–2-week gap. Special groups — pregnant women, children, the elderly, and those with liver or kidney impairment — should determine the dose and course after consulting a physician or pharmacist.

Suo Yang

Contraindications & Safety Warnings

1. Who Should Avoid It

  • Yin-deficiency fire-flaring — dry mouth and tongue, hot hands and feet, tidal heat and night sweats, red tongue with little coating — not for use.
  • Pregnancy and breastfeeding — special physiological states — avoid use.
  • Children — bodies not yet fully developed — do not self-administer.
  • The elderly — weaker liver-kidney metabolic ability — use under a physician's guidance.
  • Liver or kidney impairment — avoid self-administering, to avoid adding burden to the body.
  • Allergy to Suo Yang or Cynomoriaceae-related plants — not for use.
  • Those in special treatment — such as anticoagulation, blood-pressure, or glucose-lowering treatment — consult a physician before deciding whether to use it.

2. Interactions and Diet Notes

Suo Yang may interact with anticoagulants, blood-pressure medications, and glucose-lowering medications, affecting the absorption or metabolism of the drugs. Those taking such medications should consult a doctor or pharmacist first, and not take Suo Yang on their own. There is no sufficient evidence of a general "food clash" between ordinary foods, but certain herbs can interact with specific drugs — those on medication should consult a doctor or pharmacist first.

3. Adverse Reactions and Overdose Risk

Overdose of Suo Yang may cause "fire" symptoms — dry mouth and tongue, mouth sores, and dry, bound stool — and may also bring gastrointestinal discomfort such as bloating and nausea. If marked discomfort, allergy signs (rash, itching, breathing difficulty), persistent vomiting, altered consciousness, or rapidly worsening symptoms appear, stop at once and seek medical care.

Frequently Asked Questions About Suo Yang

What is Suoyang? Is it the same as Roucongrong or Bajitian?
Suoyang is the dried fleshy stem of Cynomorium songaricum, Latin name Cynomorii Herba. It is a common Chinese medicine centered on tonifying kidney yang, benefiting essence and blood, and moistening the intestines to relieve constipation. Roucongrong tonifies kidney yang and moistens the intestines. Bajitian tonifies kidney yang and dispels wind-damp. They cannot be used interchangeably in equal amounts. Prescribe as Suoyang. Caution in yin deficiency with fire effulgence.
What are the composition and effects of Suoyang?
Pharmacopoeial name Suoyang, Latin Cynomorium songaricum Rupr. Sweet in taste, warm in nature, enters the Liver, Kidney and Large Intestine meridians. Functions to tonify kidney yang, benefit essence and blood, and moisten the intestines to relieve constipation. Used for kidney yang insufficiency, essence and blood deficiency, lumbar and knee weakness, impotence, and dry-intestine constipation. Tonifies the kidney and moistens the intestines.
How to choose between raw and processed? Can Roucongrong replace it?
Cut into sections and used raw. Roucongrong emphasizes moistening the intestines rather than strongly benefiting essence, and cannot replace it in equal amounts. Commercial products are standardized; do not adjust arbitrarily.
What is the dosage of Suoyang? Can it be used daily as a kidney-tonifying tea?
Decoction, 5-10g. Modern use requires physician-determined dosage. It is not a year-round "Suoyang tea." Yin deficiency with fire effulgence will be further injured by prolonged use. Yang deficiency requires short-term, physician-determined dosage and cannot replace evaluation.
What are the contraindications of Suoyang? Can pregnant women use it?
Not suitable for yin deficiency with fire effulgence, spleen deficiency diarrhea, or excess heat constipation. Pregnant women require physician evaluation. Stop if dry mouth or irritability with heat occur. Seek immediate medical care for severe impotence or constipation.
Can Suoyang tonify kidney yang, benefit essence and blood, and moisten the intestines?
It can assist kidney yang insufficiency, essence and blood deficiency, lumbar and knee weakness, impotence, and dry-intestine constipation. It tonifies kidney yang, benefits essence and blood, and moistens the intestines, but is not a specific remedy for all yang deficiency or all constipation.
Can Suoyang be taken daily as a kidney-tonifying or intestine-moistening tea?
Kidney yang insufficiency can be used short-term in formulas; yin deficiency with fire effulgence will be further injured. The idea that "Suoyang must tonify the kidney" cannot replace evaluation. Tonifying kidney yang and moistening the intestines requires physician-determined formulation and dosage.
How to choose between Suoyang, Roucongrong, Bajitian, Yinyanghuo, and Tusizi?
Suoyang tonifies kidney yang and benefits essence and blood while moistening the intestines, suited to impotence and constipation. Roucongrong tonifies kidney yang and moistens the intestines. Bajitian tonifies kidney yang and dispels wind-damp. Yinyanghuo tonifies kidney yang and strengthens sinews. Tusizi tonifies the kidney and secures essence. Choose Suoyang for tonifying the kidney; Roucongrong for moistening the intestines; Bajitian for dispelling wind; Yinyanghuo for strengthening sinews; Tusizi for securing essence. Pattern differentiation applies, but large doses of Suoyang are contraindicated in yin deficiency with fire effulgence.
How is Suoyang commonly modified? What is a representative usage?
Modifications depend on the pattern. Add Yinyanghuo for impotence; add Roucongrong for constipation. Specify Suoyang; do not substitute Roucongrong in equal amounts for benefiting essence.
How to select and store Suoyang?
Choose regular Chinese medicinal materials with intact fleshy stems. Discard if moldy, damp, or abnormal in odor. Store in a ventilated, dry place. Purchase "Suoyang"; do not substitute Roucongrong or Bajitian in equal amounts for tonifying kidney yang, benefiting essence and blood, and moistening the intestines.

Related Products

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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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Suo Yang (Cynomorium Stem): Tonifies kidney yang, benefits essence and blood, and moistens the intestines