Herb Whole plant / Aerial parts (全草 quán cǎo)

Shen Jin Cao

Club moss herb · 伸筋草

Lycopodium japonicum Thunb. · Herba Lycopodii

Also known as: Shi Song (石松)

Shen Jin Cao (Club moss herb) plant

Images shown are for educational purposes only

Shēn Jīn Cǎo, or common clubmoss, is a classic Chinese herb for joint and muscle problems. Its name literally means 'stretch the tendon herb,' reflecting its primary use for stiff, painful joints, muscle cramps, numbness, and difficulty bending or straightening the limbs. It is especially helpful when these problems are caused by cold and damp conditions, such as in many forms of arthritis.

Category Wind-Damp dispelling herbs (祛风湿药) Channel and collateral opening herbs
Therapeutic focus Bone and Joint Health Joint and Muscle Pain Relief Arthritis Support Injury and Trauma Recovery

TCM Properties

Temperature

Warm

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels entered

Liver, Spleen, Kidneys

Parts used

Whole plant / Aerial parts (全草 quán cǎo)

Available in our store
View in Store
From $21.00

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

Every herb has a specific set of actions — here's what Shen Jin Cao does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Shen Jin Cao is primarily used to support these areas of health:

Bone and Joint Health Joint and Muscle Pain Relief Arthritis Support Injury and Trauma Recovery

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Shen Jin Cao performs to restore balance in the body:

Dispels Wind-Dampness Relaxes the Sinews and Unblocks the Collaterals Disperses Cold Reduces Swelling and Alleviates Pain

How these actions work

'Dispels Wind-Dampness' means Shēn Jīn Cǎo helps the body expel two common pathogenic factors, Wind and Dampness, that are responsible for joint pain, stiffness, and heaviness. In TCM, when Wind and Dampness lodge in the channels and joints, they cause what is called Painful Obstruction (Bì Zhèng). Shēn Jīn Cǎo's warm, acrid, and bitter nature allows it to dry Dampness and scatter Wind from the affected areas. This is why it is frequently used for conditions like arthritis, rheumatic joint pain, and limb heaviness.

'Relaxes sinews and opens the collaterals' is the action Shēn Jīn Cǎo is most famous for. Its very name literally translates to 'stretch the tendon herb.' This action means it helps loosen tight, contracted muscles and tendons while restoring smooth flow through the smaller network vessels (collaterals) of the body. It is especially well suited for stiffness, difficulty bending and straightening the joints, muscle cramps, numbness, and the aftereffects of traumatic injury. Its ability to move freely through the channels (described in classical texts as 'mobile in nature, moving rather than staying still') makes it particularly effective for these conditions.

'Disperses Cold' reflects its warm temperature. It helps drive out Cold that has settled into the joints and muscles, relieving the aching and stiffness that worsens in cold or damp weather. 'Reduces swelling and alleviates pain' relates to its use in traumatic injuries, where it helps resolve local swelling and bruising by promoting the movement of Qi and Blood through the affected area.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Shen Jin Cao is used to help correct these specific patterns.

Why Shen Jin Cao addresses this pattern

Shēn Jīn Cǎo is one of the most representative herbs for Wind-Cold-Damp Painful Obstruction (Bì Zhèng). Its warm temperature and acrid, bitter tastes allow it to scatter Wind, dry Dampness, and disperse Cold from the channels and joints. It enters the Liver channel, which governs the sinews, giving it a special ability to relax contracted tendons and open blocked collaterals. When Wind, Cold, and Dampness invade the body and lodge in the musculoskeletal system, they obstruct the flow of Qi and Blood, causing joint pain, stiffness, and heaviness. Shēn Jīn Cǎo directly addresses this pathomechanism by restoring movement and flow in the affected areas.

A practitioner would look for one or more of these signs

Moving Pain

Aching joint pain that worsens with cold or damp weather

Joint Stiffness

Difficulty bending and straightening the joints

Numbness In The Limbs

Limb numbness and heaviness

Muscle Cramps

Muscle cramps and tendon tightness

Commonly Used For

These are conditions where Shen Jin Cao is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Wind-Cold

TCM Interpretation

TCM understands rheumatoid arthritis primarily as a form of Painful Obstruction (Bì Zhèng) caused by the invasion of Wind, Cold, and Dampness into the channels and joints. When the body's defensive Qi is insufficient, these pathogenic factors penetrate the exterior and lodge in the musculoskeletal system, obstructing the smooth flow of Qi and Blood. Over time, this stagnation can generate localized Heat and lead to the formation of Phlegm, which explains the chronic swelling and joint deformity seen in advanced cases. The Liver (which governs sinews), Spleen (which transforms Dampness), and Kidneys (which govern bones) are the key organ systems involved.

Why Shen Jin Cao Helps

Shēn Jīn Cǎo directly targets the core pathomechanism of rheumatoid arthritis as understood in TCM. Its warm, acrid nature scatters Wind and Cold from the channels, while its bitter taste dries the Dampness that contributes to joint swelling and heaviness. Most importantly, its ability to relax the sinews and open the collaterals helps restore movement to stiff, painful joints. Because it enters the Liver channel (which governs the sinews), it has a particular affinity for conditions where tendons and muscles are tight, contracted, or painful. Modern pharmacological research has confirmed its anti-inflammatory and analgesic properties, which align well with its traditional indications.

Also commonly used for

Osteoarthritis

Joint stiffness and difficulty with movement

Frozen Shoulder

Shoulder stiffness with difficulty raising the arm

Sciatica

Leg pain and numbness along the nerve pathway

Muscle Cramps

Especially calf cramps and tendon spasms

Sprains

Soft tissue injuries with swelling and limited movement

Peripheral Neuropathy

Numbness and tingling in the extremities

Shingles

Topical application of powdered herb in oil

Stroke

Spasticity and stiffness of the limbs after stroke

Herb Properties

Every herb has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Warm

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels Entered

Liver Spleen Kidneys

Parts Used

Whole plant / Aerial parts (全草 quán cǎo)

Dosage & Preparation

These are general dosage guidelines for Shen Jin Cao — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

3-12g

Maximum dosage

Up to 15g in decoction for severe Wind-Dampness Impediment, or up to 30g (one liang) when steeped in medicinal wine, as described in classical formulas. Do not exceed without practitioner supervision.

Dosage notes

Standard decoction dosage is 3-12g. For mild joint stiffness and general Wind-Dampness symptoms, 3-9g is usually sufficient. For more severe sinew contracture and stubborn Impediment pain, the dose can be increased to 9-15g. When prepared as a medicinal wine (yao jiu), larger quantities of herb (up to 30g) may be used for soaking, as alcohol extraction is more gradual. For external use (wash or compress for skin lesions such as herpes zoster), an appropriate amount is decocted and applied topically. Start at lower doses for elderly patients or those with underlying deficiency to avoid excessive dispersal of Qi.

Preparation

No special decoction handling is required. The herb is added to the decoction pot with other herbs and simmered normally. It can also be steeped in wine (yao jiu) for topical or internal use, or ground into powder for external application (mixed with oil as a paste for skin conditions like herpes zoster).

Common Herb Pairs

These ingredients are traditionally combined with Shen Jin Cao for enhanced therapeutic effect

Mu Gua
Mu Gua 1:1 (Shēn Jīn Cǎo 15g : Mù Guā 15g)

Shēn Jīn Cǎo excels at relaxing contracted sinews and opening the collaterals, while Mù Guā (Chinese quince) harmonizes the Stomach, relaxes cramping muscles, and resolves Dampness. Together they produce a powerful synergy for loosening tight tendons and relieving muscle spasm, particularly in the lower legs.

When to use: Leg cramps (especially calf cramps), muscle spasms, and sinew tightness associated with Wind-Dampness, or cramping accompanied by nausea and digestive upset.

Sang Zhi
Sang Zhi 1:1 (Shēn Jīn Cǎo 15g : Sāng Zhī 15g)

Shēn Jīn Cǎo provides warm, acrid Wind-Dampness dispelling power with strong sinew-relaxing action, while Sāng Zhī (mulberry twig) is mild and neutral, gently unblocking the channels and joints. The combination broadens the range of Painful Obstruction patterns that can be treated, since Sāng Zhī's neutral nature makes the pair suitable for both Cold-type and Heat-type joint pain.

When to use: Wind-Damp joint pain with stiffness and limited range of motion, traumatic injuries with lingering pain, especially when the practitioner needs a pair that works across both cold and warm presentations.

Tou Gu Cao
Tou Gu Cao 1:1 (Shēn Jīn Cǎo 15g : Tòu Gǔ Cǎo 15g)

Shēn Jīn Cǎo relaxes the sinews and opens the collaterals, while Tòu Gǔ Cǎo ('penetrate the bone herb') has a strong ability to carry medicinal action deep into the bones and joints. Together, they address both superficial channel obstruction and deeper skeletal pain, and are frequently used together in external wash formulas.

When to use: External soaking or wash formulas for joint pain, stiffness, and post-stroke limb contracture. Also used internally for deep-seated rheumatic pain that penetrates to the bone level.

Wei Ling Xian
Wei Ling Xian 1:1 (Shēn Jīn Cǎo 10–15g : Wēi Líng Xiān 10–15g)

Shēn Jīn Cǎo focuses on relaxing sinews and opening collaterals, while Wēi Líng Xiān is powerfully acrid and mobile, dispelling Wind-Dampness and unblocking the channels with strong analgesic effect. The combination enhances pain relief and addresses both soft tissue tightness and channel obstruction.

When to use: Stubborn Wind-Damp Painful Obstruction with significant pain, numbness, and stiffness that has persisted for a long time. Especially useful when the limbs feel heavy, weak, and numb.

Key Formulas

These well-known formulas feature Shen Jin Cao in a prominent role

Zuo Gu Shen Jing Tang 坐骨神经汤 Assistant

A well-known formula for sciatica and lower back/leg pain. Shēn Jīn Cǎo serves as an important assistant herb, contributing its sinew-relaxing and collateral-opening actions to help relieve the radiating pain and stiffness characteristic of sciatic pain.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Xu
Shen Jin Cao vs Xun Gu Feng

Both Shēn Jīn Cǎo and Xún Gǔ Fēng dispel Wind-Dampness and relieve joint pain and stiffness. Shēn Jīn Cǎo's special strength is in relaxing contracted sinews and opening the collaterals, making it the better choice when the primary complaint is tendon tightness, difficulty bending/straightening joints, or muscle cramps. Xún Gǔ Fēng is stronger at relieving pain directly and also treats Liver-Stomach disharmony with epigastric pain, an action Shēn Jīn Cǎo does not have.

Ha
Shen Jin Cao vs Hai Feng Teng

Both dispel Wind-Dampness and open the collaterals for joint pain and stiffness. Shēn Jīn Cǎo is warm and enters the Liver, Spleen, and Kidney channels, with a particular ability to relax tight sinews. Hǎi Fēng Téng (Kadsura vine stem) is slightly warm and enters the Liver channel, and is considered better for Wind-Dampness in the upper limbs and for conditions where both Wind and Dampness are prominent with significant swelling.

Luo Shi Teng
Shen Jin Cao vs Luo Shi Teng

Both open the collaterals and treat joint pain. However, Luò Shí Téng (star jasmine stem) is cool in nature and better suited for Hot Painful Obstruction with red, swollen, hot joints, while Shēn Jīn Cǎo is warm and better for Cold-Damp Painful Obstruction with stiffness, cramps, and pain worsened by cold weather. Their opposite thermal natures make them suited to opposite presentations.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Shen Jin Cao

Two closely related species are commonly used interchangeably with the official Lycopodium japonicum in different parts of China: (1) Pu Di Wu Gong / Chui Sui Shi Song (铺地蜈蚣/垂穗石松, Lycopodium cernuum L.), used in Jiangxi and Zhejiang provinces, with similar actions; (2) Yu Bai (玉柏, Lycopodium obscurum L.), used in Gansu and Sichuan provinces. Both are recorded in the Zhong Yao Da Ci Dian (Chinese Materia Medica Dictionary) as regional substitutes with similar therapeutic effects. However, their alkaloid profiles may differ from the official species. Care should be taken to confirm botanical identity, especially with commercial sources. The whole-herb form is generally reliable for identification by its distinctive long creeping stems and dense needle-like foliage.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any herb.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Shen Jin Cao

Non-toxic

Classically recorded as non-toxic in the Ben Cao Gang Mu. However, modern research has identified two concerns worth noting: (1) Lycopodine, the principal alkaloid, has demonstrated toxicity at high doses in animal studies, with an LD50 of approximately 27.6 mg/kg IV in mice. Toxic signs include hyperexcitability, tonic-clonic convulsions, paralysis, and respiratory failure. At standard oral decoction doses (3-12g of whole herb), the alkaloid content is very low (approximately 0.12% total alkaloids) and well within safe limits. (2) The plant is a natural aluminum accumulator (an indicator plant for aluminum ore), with aluminum content ranging from 0.46% to 1.05% across different batches. Aluminum has known neurotoxic potential with chronic high-dose exposure. Standard-dose, time-limited clinical use is not expected to pose a significant risk, but prolonged unsupervised use should be avoided.

Contraindications

Situations where Shen Jin Cao should not be used or requires extra caution

Avoid

Pregnancy. Shen Jin Cao has Blood-moving and channel-activating properties, and pharmacological studies show that its alkaloid lycopodine has a stimulating effect on the uterus in animal models, which could disturb fetal stability.

Avoid

Active bleeding or excessive blood loss. The herb's Blood-invigorating nature could worsen hemorrhage. The Si Chuan Zhong Yao Zhi (Sichuan Materia Medica) specifically warns against use in those with excessive bleeding.

Caution

Qi deficiency without exterior pathogen involvement. The Dian Nan Ben Cao (Materia Medica of Southern Yunnan) states that Shen Jin Cao is suitable for those with excess conditions (qi shi zhe yong) and should be avoided in deficiency states (xu zhe ji), as its dispersing nature can further deplete Qi.

Caution

Individuals with known contact sensitivity to clubmoss or related Lycopodiaceae plants. Reports exist of contact dermatitis with localized skin burning, redness, blistering, and joint swelling when the herb is applied topically.

Caution

Yin deficiency with significant fluid depletion. The herb is warm, pungent, and drying in nature, which may worsen dryness and injure Yin fluids if used inappropriately.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Contraindicated in pregnancy. The Si Chuan Zhong Yao Zhi explicitly states that pregnant women should not take this herb. Its Blood-invigorating and channel-opening properties carry risk of disturbing fetal stability. Furthermore, pharmacological studies on the alkaloid lycopodine have demonstrated excitatory effects on the uterus in animal models (rabbit, rat, and guinea pig), which could theoretically promote uterine contractions and endanger the pregnancy.

Breastfeeding

Insufficient data exists on the transfer of Shen Jin Cao alkaloids into breast milk. Given the presence of pharmacologically active alkaloids (lycopodine and others) with effects on the nervous system and smooth muscle, caution is advised. Breastfeeding mothers should use this herb only under practitioner supervision and for limited duration.

Children

Some sources state that Shen Jin Cao is not suitable for use in children. If used in older children under practitioner guidance, doses should be substantially reduced (typically one-third to one-half of the adult dose depending on age and body weight). This herb is not appropriate for infants or young children given its dispersing nature and alkaloid content.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Shen Jin Cao

There are reported cases of allergic contact dermatitis when Shen Jin Cao was used concurrently with certain pharmaceuticals, including penicillin, streptomycin, chloramphenicol, neomycin, sulfonamides, benzocaine, quinidine, thimerosal (thiomersal), para-phenylenediamine formaldehyde, and iodine contrast agents. Symptoms included localized skin burning pain, well-demarcated erythema, vesicles, and bullae. These appear to be sensitization reactions rather than true pharmacokinetic interactions, but co-administration with these agents should be approached with caution.

Due to the presence of lycopodine alkaloids that have demonstrated hypotensive effects in animal models, theoretical caution is warranted when combining with antihypertensive medications, though no clinical interactions have been formally documented.

Dietary Advice

Foods and dietary considerations when taking Shen Jin Cao

When taking Shen Jin Cao for Wind-Dampness conditions, it is advisable to avoid cold and raw foods, iced beverages, and excessively greasy or heavy foods, as these can worsen Dampness accumulation and counteract the herb's warming, channel-opening action. Moderate consumption of warming foods and mild spices that support circulation is compatible with the herb's therapeutic direction.

Botanical Description

Physical characteristics and morphology of the Shen Jin Cao source plant

Shen Jin Cao is the dried whole plant of Lycopodium japonicum Thunb. (family Lycopodiaceae), commonly called Japanese clubmoss or ground pine. It is an evergreen, spore-bearing perennial that creeps along the ground with long trailing stems reaching up to 2 meters in length and 1 to 3 mm in diameter. The stems branch dichotomously (forking into two equal divisions) and are densely covered with small, spirally arranged, needle-like leaves that are 3 to 5 mm long, giving the plant a miniature pine-like appearance.

The plant produces small, club-shaped spore cones (strobili) at the tips of erect branches, which is the origin of the common name "clubmoss." It grows in shaded, moist acidic soils in sparse forests, shrublands, grassy slopes, and along streams at elevations from 100 to 2,300 meters. It is distributed across eastern and southern Asia, including China, Japan, India, Nepal, Vietnam, and Myanmar.

Sourcing & Harvesting

Where Shen Jin Cao is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Summer to autumn, when the stems and leaves are at their most lush and vigorous.

Primary growing regions

Hubei province is considered the primary daodi (terroir) region for Shen Jin Cao. It is also substantially produced in Zhejiang, Jiangsu, Hunan, and Sichuan provinces. The plant grows wild in shaded forests and acidic soils across much of China, including the northeast, east, south, southwest, and Inner Mongolia. Internationally, it is found in Japan, India, Nepal, Vietnam, and other parts of southern and eastern Asia.

Quality indicators

Good quality Shen Jin Cao has a soft, pliable texture. The stems and leaves should be yellow-green to light yellowish-brown in color. The creeping stems are thin, cylindrical, and slightly curved, with dense, spirally arranged, needle-like leaves still intact. On cross-section, the cortex is pale yellow and the central wood (pith) is whitish. The herb should have minimal odor and a bland taste. Avoid material that is overly brown, brittle with many broken-off leaves, or contaminated with excessive soil or other debris.

Classical Texts

Key passages from the classical Chinese medical texts that describe Shen Jin Cao and its therapeutic uses

Ben Cao Shi Yi (《本草拾遗》, Supplements to the Materia Medica, Tang Dynasty)

Chinese: 「主久患风痹，脚膝疼冷，皮肤不仁，气力衰弱。」

English: "Treats long-standing Wind-Impediment, cold pain in the legs and knees, numbness of the skin, and weakened physical strength."

Dian Nan Ben Cao (《滇南本草》, Materia Medica of Southern Yunnan)

Chinese: 「石松，其性走而不守，其用沉而不浮，得槟榔良。下气，消胸中痞满横格之气，推胃中隔宿之食，去年久腹中之坚积，消水肿。」

English: "Shi Song (Stone Pine): Its nature is to move rather than stay, its action descends rather than floats, and it works well paired with Bing Lang (Areca Seed). It directs Qi downward, disperses stifling fullness in the chest, pushes out stagnant food lingering in the stomach, removes chronic hard accumulations in the abdomen, and reduces edema."

Sheng Cao Yao Xing Bei Yao (《生草药性备要》, Essential Preparations of Raw Herbal Properties)

Chinese: 「消肿，除风湿。浸酒饮，舒筋活络。其根治气结疼痛，损伤，金疮内伤，去痰止咳。」

English: "Reduces swelling and eliminates Wind-Dampness. Steeped in wine and drunk, it relaxes the sinews and opens the channels. Its root treats Qi-knotted pain, injuries, internal damage from trauma, and dispels phlegm to stop coughing."

Historical Context

The history and evolution of Shen Jin Cao's use in Chinese medicine over the centuries

Shen Jin Cao was originally known as Shi Song (石松, "Stone Pine") because it grows on rocky ground and its foliage resembles a miniature pine tree. It was first recorded in the Tang Dynasty text Ben Cao Shi Yi (Supplements to the Materia Medica, ca. 739 AD), which described it as growing on Tiantai Mountain, "like a pine, one to two chi tall." The name "Shen Jin Cao" (伸筋草, literally "Stretch-the-Sinews Herb") came into use later, directly reflecting its primary therapeutic role: relaxing tight sinews and restoring smooth joint movement.

The herb has accumulated dozens of folk names across different regions of China, reflecting its widespread use. Examples include Guo Shan Long (过山龙, "Crossing-Mountain Dragon") in Yunnan, Kuan Jin Teng (宽筋藤, "Sinew-Relaxing Vine") in Guangdong, and Feng Wei Shen Jin (凤尾伸筋, "Phoenix-Tail Sinew-Stretcher") in Hunan. The Dian Nan Ben Cao characterized it as a herb whose "nature is to move, not to stay" (其性走而不守), highlighting its strong dispersing and channel-opening quality. Beyond musculoskeletal use, it was traditionally steeped in rice wine as a folk remedy for joint pain, a practice still common in parts of southern China.

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Shen Jin Cao

1

Appraisal of Anti-inflammatory Potential of the Clubmoss, Lycopodium clavatum L. (Preclinical study, 2007)

Orhan I, Küpeli E, Şener B, Yesilada E. Journal of Ethnopharmacology, 2007, 109(1): 146-150.

This study tested four different extracts and the alkaloid fraction of Lycopodium clavatum in a mouse model of inflammation (acetic acid-induced capillary permeability). The chloroform extract and the alkaloid fraction showed significant anti-inflammatory effects, with 24.3% and 32.1% inhibition of inflammation respectively. Chemical analysis identified lycopodine as the major active component (84.5% of the alkaloid fraction), supporting the traditional use of the herb for painful inflammatory conditions.

PubMed
2

Investigation of AChE Inhibitory and Antioxidant Activities of Traditionally Used Lycopodium Species (Preclinical study, 2012)

Konrath EL, Neves BM, Lunardi PS, Passos CDS, Simões-Pires A, Ortega MG, Gonçalves CA, Cabrera JL, Moreira JCF, Henriques AT. Journal of Ethnopharmacology, 2012, 139(1): 58-67.

Alkaloid-enriched extracts from Lycopodium clavatum were tested for acetylcholinesterase (AChE) inhibitory activity and antioxidant effects in rat brain tissue. The extracts inhibited AChE in a dose- and time-dependent manner across cortex, striatum, and hippocampus regions. After acute administration, they also reduced lipid peroxidation and increased catalase activity. The main alkaloids identified were lycopodine and acetyldihidrolycopodine. This suggests potential relevance to neurodegenerative processes such as Alzheimer's disease.

3

Serratane Triterpenoids Isolated from Lycopodium clavatum Attenuate the Production of Inflammatory Mediators (Preclinical study, 2020)

Jo A, Kim CE, Lee M. Bioorganic Chemistry, 2020, 96: 103632.

Serratane-type triterpenoids were isolated from Lycopodium clavatum via bioactivity-guided fractionation and tested for anti-inflammatory effects. The isolated compounds demonstrated the ability to reduce the production of inflammatory mediators, suggesting potential as candidates for treating inflammatory bowel disease.

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.