Herb Rhizome (根茎 gēn jīng)

Gou Ji

Chain fern rhizome · 狗脊

Cibotium barometz (L.) J. Sm. · Rhizoma Cibotii

Also known as: Jin Mao Gou Ji (金毛狗脊), Jin Gou Ji (金狗脊)

Gou Ji (Chain fern rhizome) plant

Images shown are for educational purposes only

Gou Ji is the dried rhizome of the golden hair dog fern, covered in distinctive golden-yellow fur. It is primarily used for lower back pain, stiff spine, weak knees, and joint pain caused by cold and dampness, especially in older adults. It also helps with frequent urination and excessive vaginal discharge related to Kidney weakness.

Category Wind-Damp dispelling herbs (祛风湿药) Wind-Damp dispelling herbs that strengthen sinews and bones (祛风湿强筋骨药)
Therapeutic focus Bone and Joint Health Lower Back and Knee Health Urinary Health Mobility and Flexibility

TCM Properties

Temperature

Warm

Taste

Bitter (苦 kǔ), Sweet (甘 gān)

Channels entered

Liver, Kidneys

Parts used

Rhizome (根茎 gēn jīng)

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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 Gou Ji does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Gou Ji is primarily used to support these areas of health:

Bone and Joint Health Lower Back and Knee Health Urinary Health Mobility and Flexibility

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Gou Ji performs to restore balance in the body:

Dispels Wind-Dampness Nourishes Liver and Kidney Yin Strengthens the Lower Back and Knees Strengthens the Sinews and Bones Warms and Tonifies the Lower Origin

How these actions work

'Dispels Wind-Dampness' means Gou Ji helps clear the pathogenic influences of Wind, Cold, and Dampness from the muscles, joints, and channels. This is particularly relevant for people who experience joint pain, stiffness, or heaviness in the lower back and knees that worsens in cold or damp weather. The herb's bitter taste dries Dampness while its warm nature scatters Cold.

'Tonifies the Liver and Kidneys' means Gou Ji nourishes and strengthens the Liver and Kidney organ systems. In TCM, the Kidneys govern the bones and the Liver governs the sinews (tendons and ligaments). When these organs are weak, a person may experience a sore and weak lower back, soft knees, and difficulty standing or walking for long periods. The herb's sweet taste and warm nature provide gentle nourishment to these organ systems.

'Strengthens the lumbar spine and knees' refers to Gou Ji's particular affinity for the lower back and knee area. Classical texts describe it as making the spine firm so that bending and straightening become easy again. This is why it is especially valued for the elderly or anyone with chronic lower back weakness.

'Warms and consolidates the lower origin' means Gou Ji can firm up the Kidney's holding function. When Kidney Qi is weak, it cannot properly contain urine or vaginal discharge. This is why the processed (sand-baked) form of Gou Ji is used for frequent urination, urinary incontinence, and excessive vaginal discharge due to Kidney deficiency.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Gou Ji is used to help correct these specific patterns.

Why Gou Ji addresses this pattern

When the Liver and Kidneys are depleted, the sinews and bones lose their nourishment, leading to a sore and weak lower back, soft knees, and difficulty walking. Gou Ji enters the Liver and Kidney channels and its sweet, warm nature gently tonifies these organs. Its bitter taste also dries any concurrent Dampness. The classical Shen Nong Ben Cao Jing noted that this herb is "especially beneficial for the elderly" because age-related Liver-Kidney depletion is so common.

A practitioner would look for one or more of these signs

Lower Back Pain

Chronic, dull aching in the lower back

Knee Pain

Weak, soft knees with difficulty standing

Muscle Weakness

Weak legs, difficulty walking

Frequent Urination

Especially in elderly patients

Commonly Used For

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

Arises from: Kidney and Liver Yin Deficiency Wind-Cold

TCM Interpretation

TCM considers the lower back the 'mansion of the Kidneys.' When the Kidneys are weak, the lower back loses its structural support and becomes sore and weak. Cold and Dampness can also settle into the lumbar region, obstructing the channels and causing stiffness and pain. Chronic lower back pain often involves both Kidney deficiency (the root cause) and pathogenic Cold-Dampness (the triggering factor), creating a mixed deficiency-excess pattern that requires simultaneous tonification and pathogen expulsion.

Why Gou Ji Helps

Gou Ji directly addresses both sides of chronic lower back pain. Its warm, sweet nature tonifies the Liver and Kidneys to strengthen the spine from within, while its bitter taste dries Dampness and its warmth scatters Cold from the lumbar channels. Classical commentators described it as "supplementing while moving" (补而能走), meaning it nourishes without causing stagnation. Its particular affinity for the spinal region makes it one of the most targeted herbs for this condition.

Also commonly used for

Rheumatoid Arthritis

Joint pain and stiffness from Wind-Cold-Damp Bi

Sciatica

Radiating lower back and leg pain

Frequent Urination

Due to Kidney Qi deficiency

Urinary Incontinence

Especially in the elderly

Thin Vaginal Discharge

Excessive clear/white discharge from Kidney deficiency

Ankylosing Spondylitis

Spinal stiffness and pain

Bone Spurs

Lumbar and cervical osteophytes

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), Sweet (甘 gān)

Channels Entered

Liver Kidneys

Parts Used

Rhizome (根茎 gēn jīng)

Dosage & Preparation

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

Standard dosage

6–12g

Maximum dosage

Up to 15–20g in decoction for severe painful obstruction or significant Kidney deficiency, under practitioner supervision.

Dosage notes

Use standard doses (6–12g) for general tonification of the Liver and Kidney and strengthening the lower back and knees. Higher doses (up to 15g) may be used for more pronounced wind-damp painful obstruction with significant lower back stiffness. The sand-fried form (tang gou ji) is preferred for tonifying the Liver and Kidney and strengthening bones, while the raw form emphasizes dispelling wind-dampness and freeing the joints. For external hemostatic use, the golden hairs can be applied directly to wounds after sterilization.

Preparation

The golden hairs on the rhizome must be thoroughly removed before internal use. For decoction, Gou Ji is typically used in sand-fried form (tang gou ji), which makes the material crisp and easier to decoct while removing residual hairs. No special decoction handling (such as pre-decocting or wrapping) is required for the properly processed form.

Processing Methods

In TCM, the same herb can be prepared in different ways to change its effects — here's how processing alters what Gou Ji does

Processing method

Raw Gou Ji slices are stir-fried with hot sand (sand-baking) until they puff up and the golden hairs turn scorched brown. The sand is then sieved out and any remaining hairs are removed after cooling.

How it changes properties

Sand-baking makes the hard rhizome crisp and easier to decoct, allowing better extraction of active compounds. It also removes the irritating golden hairs. The therapeutic emphasis shifts from dispelling Wind-Dampness and freeing the joints (the raw form's strength) toward tonifying the Liver and Kidneys and strengthening sinews and bones. The warming, consolidating action becomes more prominent. The temperature remains warm.

When to use this form

Use the sand-baked form when Liver-Kidney deficiency is the primary concern, such as chronic lower back weakness, soft knees, frequent urination, spermatorrhea, or excessive vaginal discharge from Chong-Ren deficiency-cold. This is the most commonly dispensed form in clinical practice.

Common Herb Pairs

These ingredients are traditionally combined with Gou Ji for enhanced therapeutic effect

Xu Duan
Xu Duan 1:1 (Gou Ji 15g : Xu Duan 15g)

Both herbs tonify the Liver and Kidneys and strengthen sinews and bones, but each brings a distinct strength. Gou Ji excels at dispelling Wind-Dampness and relieving spinal pain, while Xu Duan is stronger at tonifying the Kidneys and promoting blood circulation to heal damaged tissues. Together they produce a more comprehensive effect on chronic lower back and knee conditions.

When to use: Chronic lower back and knee pain from Liver-Kidney deficiency complicated by Wind-Dampness, especially with spinal stiffness and difficulty bending.

Bi Xie
Bi Xie 1:1 (Gou Ji 15g : Bi Xie 15g)

Gou Ji tonifies the Kidneys and strengthens the lower back, while Bi Xie dispels Wind-Dampness and promotes the separation of clear and turbid fluids. Together they address both the root (Kidney deficiency) and the branch (Wind-Damp obstruction) of chronic lower body pain and stiffness.

When to use: Elderly or constitutionally weak patients with Wind-Damp Bi pain in the lower back and knees, especially when accompanied by heavy or swollen legs.

Du Zhong
Du Zhong 1:1 (Gou Ji 15g : Du Zhong 15g)

Both herbs tonify the Liver and Kidneys and strengthen the lower back. Du Zhong is the stronger Kidney tonifier and can also calm Liver Yang and stabilize the fetus, while Gou Ji is superior at dispelling Wind-Dampness. Together they provide robust lumbar support with both tonifying and pathogen-clearing actions.

When to use: Chronic lower back pain with Kidney deficiency as the primary factor, where some Wind-Cold-Damp exposure is also involved.

Bu Gu Zhi
Bu Gu Zhi 1:1 (Gou Ji 15g : Bu Gu Zhi 10g)

Gou Ji dispels Wind-Dampness and strengthens the sinews and bones, while Bu Gu Zhi warms Kidney Yang and consolidates essence. Together they warm and strengthen the lower back for conditions rooted in Kidney Yang deficiency with cold-type lower back pain.

When to use: Cold pain in the lower back and knees, weak and soft legs, and urinary frequency from Kidney Yang deficiency.

Comparable Ingredients

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

Du Zhong
Gou Ji vs Du Zhong

Both tonify the Liver and Kidneys and strengthen the lower back. Du Zhong is a stronger Kidney tonifier and can also calm Liver Yang and stabilize the fetus, making it the first choice for pure Kidney deficiency lower back pain or during pregnancy. Gou Ji has the additional ability to dispel Wind-Dampness, making it more suitable when Bi syndrome (joint pain from external pathogens) coexists with Kidney deficiency.

Sang Ji Sheng
Gou Ji vs Sang Ji Sheng

Both dispel Wind-Dampness and tonify the Liver and Kidneys, with similar tastes (bitter, sweet) and channel entries. Sang Ji Sheng is neutral in temperature and has an additional ability to nourish Blood and calm the fetus, making it preferable for pregnant women or those with Blood deficiency. Gou Ji is warm and has a stronger warming and consolidating effect on the lower back, making it better for cold-type Bi syndrome and urinary or vaginal discharge from Kidney Yang deficiency.

Ba Ji Tian
Gou Ji vs Ba Ji Tian

Both are warm herbs that tonify the Kidneys and dispel Wind-Dampness. Ba Ji Tian is more moistening and also strongly tonifies Kidney Yang and strengthens the reproductive function, making it a better choice for impotence and infertility. Gou Ji is better at drying Dampness (due to its bitter taste) and has a special affinity for the spine, making it superior for spinal stiffness and lumbar Bi pain.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Gou Ji

In some regions of Hunan, the rhizome of Woodwardia unigemmata (Ding Ya Gou Ji, 顶芽狗脊) is sometimes used as a local substitute for the official Cibotium barometz. The two can be distinguished by morphology: authentic Jin Mao Gou Ji has the characteristic dense golden silky hairs on the rhizome surface, while Woodwardia unigemmata lacks this distinctive golden woolly covering. Additionally, the classical texts describe an older variety of Gou Ji that resembles a dog's spine bone, which is a different plant from the golden-haired variety used in modern practice. Always verify the presence of golden-brown woolly hairs on the rhizome to confirm authentic material.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Gou Ji

Non-toxic

Gou Ji is classified as non-toxic in the Chinese Pharmacopoeia and has a long history of safe use at standard doses. The golden hairs covering the rhizome must be thoroughly removed before internal use, as they can irritate the throat and digestive tract. Processing by sand-frying (tang gou ji) makes the material crisp, easier to decoct, and helps remove residual hairs. No significant toxic components have been identified in pharmacological studies.

Contraindications

Situations where Gou Ji should not be used or requires extra caution

Caution

Kidney deficiency with Heat signs (Yin deficiency with Heat), presenting as scanty dark yellow urine, dry mouth, bitter taste, and a dry tongue. Gou Ji is warm in nature and would worsen these Heat signs.

Caution

Difficult urination (dysuria) due to Heat or damp-heat in the lower burner. The warming and consolidating nature of Gou Ji could aggravate urinary obstruction caused by Heat.

Caution

Conditions with prominent Heat or Fire signs, such as red swollen joints from hot-type painful obstruction (re bi). Gou Ji's warm nature is inappropriate when inflammatory Heat predominates.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific pregnancy contraindication is widely documented in classical or modern sources. However, as Gou Ji is a warm herb that moves Qi and strengthens the lower back and Kidney, it should be used with caution during pregnancy. Pregnant women should only take it under the guidance of a qualified practitioner, particularly given its warming and consolidating properties which could theoretically affect the lower burner dynamics during pregnancy.

Breastfeeding

No specific concerns regarding breastfeeding are documented in classical or modern sources. Gou Ji is non-toxic and is generally considered low-risk. However, there is insufficient specific data on transfer through breast milk. Nursing mothers should consult a practitioner before use.

Children

No specific classical guidance exists for pediatric use. As Gou Ji primarily treats conditions of the elderly and those with Liver-Kidney deficiency, it is rarely indicated in children. If used in pediatric cases, dosage should be reduced proportionally based on age and body weight, under practitioner supervision.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Gou Ji

No well-documented pharmaceutical drug interactions have been established for Gou Ji in peer-reviewed literature. One Chinese clinical reference suggests caution when combining with enzyme preparations, ferrous sulfate, zinc sulfate, cardiac glycosides, aminopyrine, tetracycline, rifampicin, chloramphenicol, erythromycin, and sulfonamide drugs, though these interactions are not well substantiated by pharmacological studies. As with many tannin-containing herbs, Gou Ji may theoretically reduce the absorption of certain oral medications if taken simultaneously. It is advisable to separate dosing by at least 1–2 hours when taking concurrently with Western medications.

Dietary Advice

Foods and dietary considerations when taking Gou Ji

When taking Gou Ji to strengthen the Liver, Kidney, and lower back, favour warming, nourishing foods such as bone broths, lamb, walnuts, and black beans, which support Kidney function. Avoid excessive cold, raw foods and iced drinks, which can impair Spleen and Kidney Yang. Since Gou Ji is contraindicated in Kidney deficiency with Heat, those with a tendency toward Yin deficiency Heat should moderate intake of spicy, hot, or drying foods while using this herb.

Botanical Description

Physical characteristics and morphology of the Gou Ji source plant

Cibotium barometz (L.) J. Sm. is a large evergreen tree fern belonging to the Cibotiaceae family. It grows from a thick, prostrate, woody rhizome that is densely covered in long, soft, golden-brown hairs, giving it a striking woolly appearance reminiscent of an animal. The plant can reach heights of up to 2.5–3 metres. Its fronds are very large, typically 2.5–4 metres long, bipinnate to almost tripinnate, with deep green upper surfaces and paler undersides. The leaflets are 40–80 cm long. Spore-bearing structures (sori) are located along the margins of the leaflets.

The plant thrives in warm, humid environments, typically found growing in shaded valleys, along stream banks, at the edges of forests, and on hillside gullies at elevations from 100–1,600 metres. It strongly prefers humus-rich, acidic soils and is considered an indicator species for acid soil conditions. It is native to subtropical and tropical East and Southeast Asia. Due to long-term over-harvesting from the wild and its slow regeneration, C. barometz is now listed in CITES Appendix II and is classified as a Class II nationally protected plant in China.

Sourcing & Harvesting

Where Gou Ji is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Autumn and winter (after the above-ground parts have withered), typically from late autumn through early winter.

Primary growing regions

The primary production areas are Sichuan, Fujian, Zhejiang, and Yunnan provinces in China. Additional production comes from Guangxi, Guangdong, Guizhou, Jiangxi, and Hubei. Yunnan is currently considered the main producing region. The herb grows wild across the subtropical and tropical zones of southern China, as well as in Southeast Asian countries including Vietnam, Myanmar, Thailand, and Malaysia. Due to over-harvesting, it is now a nationally protected species in China and is listed under CITES Appendix II.

Quality indicators

Good quality raw Gou Ji rhizome is irregularly block-shaped, 8-18 cm long and 3-7 cm in diameter, with a deep brown surface retaining some golden-yellow silky hairs. The upper surface should show several reddish-brown woody leaf stalk bases, while the underside has clusters of dark fine roots. The material should be hard and difficult to break. Sliced pieces (either raw or processed) should be uniformly thick, solid without hollowness, and free of remaining golden hairs. Raw slices show a visible ring of darker tissue near the outer edge (the inner endodermis). The outer zone appears deep brown and smooth, while the inner portion is lighter brown with a starchy quality. Processed (sand-fried) slices are puffed, crisp, and easy to break. The herb is odourless and has a bland, slightly astringent taste. Avoid pieces that are hollow, too soft, or still heavily covered in unshorn golden hairs.

Classical Texts

Key passages from the classical Chinese medical texts that describe Gou Ji and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

Original: 狗脊，味苦平。主腰背强，关机缓急，周痹，寒湿，膝痛，颇利老人。一名百枝。生川谷。

Translation: Gou Ji, bitter in flavour and balanced in nature. It mainly treats stiffness of the lower back, looseness or tightness of the joints, widespread painful obstruction, cold-dampness, and knee pain. It is especially beneficial for the elderly. Also called Bai Zhi. Grows in river valleys.

Ming Yi Bie Lu (《名医别录》)

Original: 疗失溺不节，男子脚弱腰痛，风邪淋露，少气目闇，坚脊，利俯仰，女子伤中，关节重。

Translation: It treats uncontrolled urination, weakness of the legs and lower back pain in men, wind evil and vaginal discharge, shortness of breath and dim vision, strengthens the spine, eases bending and straightening, and treats internal injury and heavy joints in women.

Ben Cao Zheng Yi (《本草正义》) by Zhang Shanlei

Original: 能温养肝肾，通调百脉，强腰膝，坚脊骨，利关节，而驱痹着，起痿废；又能固摄冲带，坚强督任……且温而不燥，走而不泄，尤为有利无弊，颇有温和中正气象。

Translation: It can warmly nourish the Liver and Kidney, regulate all the vessels, strengthen the lower back and knees, firm the spine, free the joints, dispel stubborn painful obstruction, and raise up atrophy and paralysis. It can also consolidate the Chong and Dai vessels and strengthen the Du and Ren vessels. Moreover, it is warm without being drying, moving without causing leakage, and is beneficial without drawbacks, possessing a gentle and balanced character.

Ben Cao Jing Shu (《本草经疏》) by Miao Xiyong

Original: 狗脊，苦能燥湿，甘能益血，温能养气，是补而能走之药也。

Translation: Gou Ji: its bitterness can dry dampness, its sweetness can nourish Blood, and its warmth can cultivate Qi. It is a herb that tonifies while also being able to move.

Historical Context

The history and evolution of Gou Ji's use in Chinese medicine over the centuries

Gou Ji was first recorded in the Shen Nong Ben Cao Jing (《神农本草经》), where it was classified as a middle-grade herb. Its name literally means "dog spine" (狗脊), reflecting the shape of the rhizome which resembles a dog's backbone. The more commonly used variety today, Jin Mao Gou Ji (金毛狗脊, "golden-haired dog spine"), gets its vivid name from the dense covering of brilliant golden-brown hairs on the rhizome, which makes the whole rootstock look like a small golden dog curled up. The classical text records several alternative names including Bai Zhi (百枝, "hundred branches"), Qiang Lü (强膂, "strengthens the spine"), and Fu Jin (扶筋, "supports the sinews"), all of which reflect its therapeutic reputation for strengthening the back and bones.

In European botanical history, this plant became famous as the legendary "Vegetable Lamb of Tartary" or "Scythian Lamb" (Agnus scythicus). When the hairy rhizome was inverted, its golden wool and root-like projections resembled a small lamb on four legs. This curious appearance led to centuries of European myths about a plant-animal hybrid growing in Central Asia. The species epithet "barometz" itself derives from a Tartar word for "lamb." The Ben Cao Zheng Yi author Zhang Shanlei praised Gou Ji as being "warm without being drying, moving without causing leakage," calling it an herb of gentle and balanced character especially suited for the elderly and constitutionally weak.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Gou Ji

1

Anti-osteoporosis activity of Cibotium barometz extract on ovariectomy-induced bone loss in rats (Preclinical study, 2011)

Zhao X, Wu ZX, Zhang Y, Yan YB, He Q, Cao PC, Lei W. Journal of Ethnopharmacology, 2011, 137(3):1083-1088.

This animal study investigated the effect of Cibotium barometz extract (CBE) on bone loss in rats whose ovaries had been removed to simulate postmenopausal osteoporosis. Rats given CBE orally for 16 weeks showed preserved bone mineral density, reduced bone turnover markers, improved bone strength, and better trabecular bone microarchitecture compared to untreated rats. The study concluded that CBE may be a potential alternative for preventing postmenopausal osteoporosis.

2

Inhibitors of osteoclast formation from rhizomes of Cibotium barometz (Phytochemical study, 2009)

Nguyen PH et al. Journal of Natural Products, 2009, 72(9):1673-1677.

Researchers isolated eight compounds from Cibotium barometz rhizomes, including two new furan derivatives (cibotiumbarosides A and B) and a new glycoglycerolipid. Several of these compounds inhibited the formation of osteoclasts (bone-destroying cells) in laboratory tests without affecting the viability of bone marrow macrophage cells, providing a molecular basis for the herb's traditional bone-protective uses.

3

Two novel polysaccharides from rhizomes of Cibotium barometz promote bone formation via activating the BMP2/SMAD1 signaling pathway (Preclinical study, 2020)

Huang D, Hou X, Zhang D, Zhang Q, Yan C. Carbohydrate Polymers, 2020, 231:115732.

This study isolated two polysaccharides from Cibotium barometz and tested their effects on pre-osteoblast cells. Both polysaccharides promoted the growth, differentiation, and mineralization of bone-forming cells. The mechanism was shown to involve activation of the BMP2/SMAD1 signaling pathway, a key bone formation pathway. The findings suggest these polysaccharides could be potential natural agents against osteoporosis.

4

Cibotium barometz polysaccharides stimulate chondrocyte proliferation in vitro by promoting G1/S cell cycle transition (In vitro study, 2017)

Fu CL, Zheng CS, Lin J, Ye JX, Mei YY, Pan CB, Wu GW, Li XH, Ye HZ, Liu XX. Molecular Medicine Reports, 2017, 15(5):3027-3034.

This laboratory study found that polysaccharides extracted from Cibotium barometz could promote the growth of cartilage cells (chondrocytes) in a dose- and time-dependent manner. The mechanism involved stimulating cells to progress through a key checkpoint in the cell division cycle. Since osteoarthritis involves insufficient cartilage cell proliferation, these polysaccharides may offer a potential treatment approach.

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.