Herb Other

Si Gua Luo

Luffa sponge · 丝瓜络

Luffa cylindrica (L.) Roem. · Retinervus Luffae Fructus

Also known as: Gua Luo (瓜络), Vegetable Sponge

Si Gua Luo (Luffa sponge) plant

Images shown are for educational purposes only

Si Gua Luo, the dried fibrous skeleton of the mature luffa gourd, is best known for its gentle ability to open blocked channels throughout the body. It is most commonly used for joint and muscle pain, chest discomfort, and to help promote breast milk flow in new mothers. Its action is mild, so it is usually combined with other herbs rather than used alone.

Category Wind-Damp dispelling herbs (祛风湿药)
Therapeutic focus Joint and Muscle Health Breastfeeding and Lactation Support Chest Comfort Circulation Support

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān)

Channels entered

Lungs, Liver, Stomach

Parts used

Other

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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 Si Gua Luo does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Si Gua Luo is primarily used to support these areas of health:

Joint and Muscle Health Breastfeeding and Lactation Support Chest Comfort Circulation Support

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Si Gua Luo performs to restore balance in the body:

Unblocks the Channels and Collaterals Invigorates Blood and Dispels Stasis Disperses Wind Promotes Lactation Resolves Phlegm Resolves Toxicity and Reduces Swelling

How these actions work

'Unblocks the channels and collaterals' (通络 tōng luò) is the primary action of Si Gua Luo. Its physical structure as a network of fibrous vascular bundles inside the luffa fruit gives it a natural affinity for the body's own network of channels and collaterals. It gently opens blocked pathways, which makes it useful for joint stiffness, muscle pain, and conditions where circulation through the smaller branches of the channel system is impaired. This is the go-to action when pain or stiffness results from Wind-Dampness lodging in the channels.

'Invigorates Blood' means Si Gua Luo helps to move stagnant Blood through the vessels. Because it enters the Liver channel, it is often used for chest and flank pain caused by Qi and Blood stagnation. It also promotes lactation ('promotes the flow of breast milk') by unblocking the breast's network vessels. This is why it is a commonly used herb for insufficient milk supply or painful breast swelling after childbirth.

'Dispels Wind' refers to its ability to drive out Wind as a pathogenic factor, particularly Wind-Dampness that causes joint pain and muscle cramping. Its action is gentle, so it is typically combined with stronger Wind-dispelling herbs in formulas for rheumatic conditions.

'Transforms Phlegm' means Si Gua Luo can help clear Phlegm accumulation, particularly in the Lungs. When Lung Heat generates thick, sticky Phlegm causing cough and chest pain, Si Gua Luo can be combined with Phlegm-resolving herbs to open the chest and ease breathing.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Si Gua Luo is used to help correct these specific patterns.

Why Si Gua Luo addresses this pattern

Si Gua Luo's sweet, neutral nature and its affinity for the Liver channel make it well suited for unblocking the channels and collaterals when Wind-Dampness lodges in the joints and muscles. Its network-like physical structure has a natural resonance with the body's own collateral vessels, and it gently dispels Wind while promoting Blood flow through the affected areas. Because its medicinal strength is mild, it is typically combined with stronger Wind-Damp dispelling herbs like Qin Jiao or Fang Feng to treat this pattern.

A practitioner would look for one or more of these signs

Moving Pain

Joint pain aggravated by wind and dampness

Muscle Stiffness

Muscle stiffness and cramping

Skin Numbness

Limb numbness and heaviness

Commonly Used For

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

Arises from: Qi And Blood Stagnation

TCM Interpretation

TCM understands insufficient lactation primarily as a problem of obstruction in the breast's network of collateral vessels. After childbirth, if Qi and Blood do not circulate smoothly, the pathways through which milk flows become blocked. This is analogous to a river being dammed: the milk exists but cannot reach its destination. Contributing factors may include Liver Qi stagnation from emotional stress, Blood stagnation from the physical trauma of delivery, or underlying Qi and Blood deficiency that leaves insufficient force to push milk through the breast channels.

Why Si Gua Luo Helps

Si Gua Luo is one of the most classically used herbs for lactation problems because its fibrous, net-like structure has a special affinity for the breast's collateral network. It gently unblocks these collaterals and invigorates Blood flow through them, restoring the pathway for milk to flow. Its sweet, neutral nature means it does not create Heat or Cold, making it safe for postpartum use. It works best for the stagnation type of insufficient lactation (where milk exists but is blocked), often combined with Wang Bu Liu Xing and Lu Lu Tong.

Also commonly used for

Intercostal Neuralgia

Chest and flank pain from channel obstruction

Hypochondrial Pain That Is Worse On Coughing And Breathing

Cough with sticky phlegm from Lung Heat

Edema

Water retention and swelling

Sciatica

Pain along the sciatic nerve from Wind-Damp obstruction

Hemorrhoids

When charred form is used for bleeding

Herb Properties

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

Temperature

Neutral

Taste

Sweet (甘 gān)

Channels Entered

Lungs Liver Stomach

Parts Used

Other

Dosage & Preparation

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

Standard dosage

5-15g

Maximum dosage

Up to 30g in decoction for acute conditions such as severe joint pain or breast abscess, under practitioner supervision. When used as calcined powder (burned to ash), the dose is 1.5-3g per serving.

Dosage notes

Use the lower range (5-9g) for mild channel-unblocking and Phlegm-transforming purposes. Higher doses (10-15g) are used for Wind-Damp painful obstruction, chest pain, and promoting lactation. Some folk medicine traditions use much larger doses (30-50g) for conditions such as gout pain or stubborn joint swelling, but this should be under professional guidance. When calcined to charcoal (Si Gua Luo Tan) for hemostatic use, the dose is typically 1.5-3g of the powder taken with warm water or wine.

Preparation

No special decoction handling required. Simply add cut segments to the decoction pot and boil with other herbs normally. For the calcined form (Si Gua Luo Tan), the herb is charred by stir-frying over high heat until the surface is black and the interior is dark brown, then sprinkled with water, cooled, and ground to powder for internal use.

Processing Methods

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

Processing method

Cut into short segments, then stir-fried with wheat bran until the surface turns yellow. Remove and sift out the bran.

How it changes properties

Dry-frying makes Si Gua Luo slightly more warming and strengthens its Blood-invigorating and pain-stopping actions while moderating any cooling tendency. The channel-unblocking effect becomes more pronounced.

When to use this form

Preferred when the primary goal is to invigorate Blood and stop pain in the collaterals, such as in chronic joint pain or traumatic injuries with channel obstruction.

Common Herb Pairs

These ingredients are traditionally combined with Si Gua Luo for enhanced therapeutic effect

Sang Zhi
Sang Zhi 1:1 (Si Gua Luo 10-15g : Sang Zhi 10-15g)

Si Gua Luo unblocks the collaterals and moves Blood, while Sang Zhi (mulberry twig) dispels Wind-Dampness and frees the joints. Together they create a stronger Wind-dispelling and collateral-opening effect than either herb alone, addressing both the channel obstruction and the joint involvement.

When to use: Wind-Damp Bi syndrome with joint pain, stiffness, or chest and flank pain caused by Wind-Dampness entering the collateral network.

Gua Lou
Gua Lou 1:2 (Si Gua Luo 10g : Gua Lou 15-20g)

Si Gua Luo works in the Blood level to invigorate Blood and unblock the collaterals, while Gua Lou works in the Qi level to clear Heat, transform Phlegm, and move Qi. Together they address both Qi and Blood stagnation simultaneously, enhancing the ability to open the chest, resolve Phlegm, and disperse breast nodules.

When to use: Chest oppression and pain (chest Bi), Lung Heat with sticky phlegm and cough, or breast abscess with pain and swelling.

Pu Gong Ying
Pu Gong Ying 1:2 (Si Gua Luo 10g : Pu Gong Ying 15-30g)

Si Gua Luo opens the breast collaterals and promotes lactation, while Pu Gong Ying (dandelion) clears Heat toxin, reduces swelling, and disperses nodules. Together they form a powerful pair for breast conditions, combining collateral-opening with toxin-clearing action.

When to use: Breast abscess (mastitis) with redness, swelling, heat, and pain, or early-stage breast lumps.

Hong Hua
Hong Hua 2:1 (Si Gua Luo 10g : Hong Hua 5g)

Si Gua Luo opens the collateral network while Hong Hua (safflower) powerfully invigorates Blood and dispels stasis. Red flower's warming, Blood-moving quality complements Si Gua Luo's neutral, collateral-unblocking nature. The classical technique of dyeing Si Gua Luo with Hong Hua (红花染丝瓜络) combines both herbs in a single preparation that directs Blood-invigorating action into the collateral vessels.

When to use: Chronic pain that has 'entered the collaterals' (久病入络), chest and flank pain from Blood stasis, or any condition where long-standing stagnation has settled in the fine collateral network.

Comparable Ingredients

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

Ji Xue Teng
Si Gua Luo vs Ji Xue Teng

Both Si Gua Luo and Ji Xue Teng (Spatholobus stem) are sweet and invigorate the collaterals while expelling Wind. However, Ji Xue Teng is slightly warm and enters the Blood more deeply, enriching Blood while simultaneously invigorating it. This makes Ji Xue Teng better for conditions combining Blood deficiency and Blood stasis. Si Gua Luo is neutral and lighter in nature, working more on promoting the smooth flow of Qi and Blood through the collaterals and transforming Phlegm. Si Gua Luo is preferred when there is Phlegm in the channels or when the breast collaterals need to be opened.

Ch
Si Gua Luo vs Chuan Shan Long

Both herbs dispel Wind, unblock the collaterals, and invigorate Blood for Wind-Damp Bi syndrome. However, Chuan Shan Long (Dioscorea nipponica) is bitter-sweet and warm, entering the Liver, Kidney, and Lung channels. It has a stronger pain-relieving action and can also stop cough and relieve wheezing. Si Gua Luo is sweet and neutral, entering the Lung, Liver, and Stomach channels. It has the unique ability to open the breast collaterals and promote lactation, which Chuan Shan Long does not share.

Lu Lu Tong
Si Gua Luo vs Lu Lu Tong

Both herbs unblock the collaterals and promote lactation. Lu Lu Tong (Liquidambar fruit) is bitter and neutral, with a stronger ability to promote urination and unblock stagnation broadly across many channels. Si Gua Luo is sweeter and gentler, with additional Phlegm-transforming ability and a special affinity for the breast network. For insufficient lactation, the two are often used together for complementary collateral-opening effects.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Si Gua Luo

Si Gua Luo from the standard species Luffa cylindrica (smooth luffa) may be substituted with the vascular skeleton of the ridged luffa, Luffa acutangula (粤丝瓜, Yue Si Gua), which has a similar appearance but retains its outer skin with 10 prominent longitudinal ridges and a greyish-yellow, more brittle rind. The Chinese Pharmacopoeia accepts both species, but they are distinguished commercially. Authentic Si Gua Luo from L. cylindrica has a smooth, clean, white-to-yellowish fibrous skeleton after processing, while the Guangdong-type "Si Gua Bu" from L. acutangula often retains the outer skin and seeds. Quality adulteration is uncommon given the herb's low cost, but poorly processed material with excessive residual seeds, skin, or fruit flesh reduces quality.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Si Gua Luo

Non-toxic

Si Gua Luo is classified as non-toxic. Animal studies have found that oleanolic acid (a key constituent) administered orally at 120 mg/kg showed no obvious toxicity or adverse reactions, and examination of 11 organs revealed no significant damage after 10 consecutive days of dosing. The herb has a long history of safe dietary and medicinal use at standard doses. No toxic components or symptoms of toxicity have been reported in the literature.

Contraindications

Situations where Si Gua Luo should not be used or requires extra caution

Caution

Spleen and Stomach deficiency with cold: Si Gua Luo has a slightly cool nature and is slippery in quality. In people with underlying cold and weakness of the digestive system (loose stools, poor appetite, cold abdomen), it may worsen these symptoms. Use cautiously and combine with warming herbs if necessary.

Caution

Excessive menstrual bleeding or active hemorrhage (raw form): The raw herb invigorates Blood and unblocks the channels, which could theoretically worsen active bleeding. The charred form (Si Gua Luo Tan) is actually used to stop bleeding, so the correct processing form matters.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Si Gua Luo is traditionally noted for its Blood-invigorating and channel-unblocking properties, and Luffa cylindrica has been ethnopharmacologically described as traditionally prescribed for inducing labor. While the vascular bundle (Si Gua Luo) is milder than other parts of the plant, pregnant women should use it with caution and only under professional guidance, particularly during the first trimester. Avoid the charred form and high doses during pregnancy.

Breastfeeding

Si Gua Luo is traditionally considered not only safe but actively beneficial during breastfeeding. One of its primary classical indications is insufficient lactation (乳汁不通) and breast abscess (乳痈). It is commonly combined with Wang Bu Liu Xing, Lu Lu Tong, or pig trotters to promote milk flow. No adverse effects on breastfeeding infants have been reported in the traditional literature or modern sources. It is generally considered safe at standard doses during lactation.

Children

Si Gua Luo is mild and generally well tolerated. It can be used in children at reduced doses proportional to age and body weight (typically one-third to one-half of the adult dose). It has been traditionally used in pediatric practice for treating pox eruptions and skin rashes. No specific age restrictions are noted in the literature.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Si Gua Luo

No well-documented pharmaceutical drug interactions have been reported for Si Gua Luo. Its known pharmacological activities (mild analgesic, anti-inflammatory, sedative) are modest at standard medicinal doses. Theoretically, its Blood-invigorating properties could have an additive effect with anticoagulant or antiplatelet medications, but this has not been clinically demonstrated. The German Commission E Monographs noted no known risks or interactions associated with luffa.

Dietary Advice

Foods and dietary considerations when taking Si Gua Luo

No specific dietary restrictions are noted for Si Gua Luo. When used for promoting lactation, it is traditionally combined with nourishing foods such as pig trotters, crucian carp soup, or figs to support milk production. When used for Wind-Damp joint pain, it is advisable to avoid cold, raw foods and excessive greasy foods that could generate Dampness.

Botanical Description

Physical characteristics and morphology of the Si Gua Luo source plant

Si Gua Luo is the dried vascular bundle (fibrous skeleton) of the mature fruit of Luffa cylindrica (L.) Roem., a vigorous annual climbing vine in the Cucurbitaceae (gourd) family. The plant grows rapidly on trellises or fences, producing long, hairy stems with tendrils and large, lobed leaves. It bears bright yellow flowers and elongated cylindrical fruits that resemble large cucumbers, typically 25–60 cm long and 6–10 cm in diameter.

When the fruit is left on the vine until fully mature and dry, the outer skin and flesh decompose or can be rubbed away, revealing the intricate internal network of fibrous vascular bundles. This sponge-like skeletal framework, yellowish-white in colour, lightweight yet tough and elastic, is the medicinal product known as Si Gua Luo (also called loofah sponge). In many Asian countries, fresh young luffa is commonly eaten as a vegetable in soups and stir-fries.

Sourcing & Harvesting

Where Si Gua Luo is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Summer to autumn, when the fruit is fully mature, the outer skin has turned yellow, and the interior has dried out.

Primary growing regions

Si Gua Luo is cultivated throughout China, both north and south. The recognized high-quality production regions (dao di) are Zhejiang Province (especially Cixi, Haining, and Yuyao counties) and Jiangsu Province (especially Nantong, Suzhou, Qidong, and Haimen). Cixi in Zhejiang is traditionally considered the source of the finest quality Si Gua Luo. The herb is also produced for domestic use in many other provinces but is exported primarily from Zhejiang and Jiangsu.

Quality indicators

Good quality Si Gua Luo should be large, complete, and roughly cylindrical in shape (25-70 cm long). The fibrous network should be clearly defined, fine-textured, tough and elastic but not brittle. The colour should be pale yellowish-white. It should be lightweight, odourless (or with a very faint scent), and bland in taste. The cross-section should reveal three hollow chambers. Avoid pieces that are broken, darkened, discoloured to brown or grey, contain residual seeds or fruit flesh, or are excessively brittle. Pieces from Zhejiang (especially Cixi) are traditionally prized for being white, large, straight, and firm.

Classical Texts

Key passages from the classical Chinese medical texts that describe Si Gua Luo and its therapeutic uses

《本草纲目》(Ben Cao Gang Mu) — Li Shizhen

Original: 丝瓜老者，筋络贯串，房隔联属，故能通人脉络脏腑，而去风解毒，消肿化痰，祛痛杀虫，治诸血病。

Translation: When the luffa is old, its fibrous network runs throughout and its chambers connect to one another. Therefore it can unblock the channels, collaterals, and organs of the human body, dispel Wind and resolve toxins, reduce swelling and transform Phlegm, relieve pain and kill parasites, and treat various Blood disorders.

《本草再新》(Ben Cao Zai Xin)

Original: 通经络，和血脉，化痰顺气。

Translation: Unblocks the channels and collaterals, harmonizes the Blood vessels, transforms Phlegm, and smooths the flow of Qi.

《医林纂要》(Yi Lin Zuan Yao)

Original: 凉血渗血，通经络，托痘毒。

Translation: Cools the Blood and promotes its movement, opens the channels and collaterals, and draws out pox toxins.

《本草便读》(Ben Cao Bian Du)

Original: 丝瓜络，入经络，解邪热。热除则风去，络中津液不致结合而为痰，变成肿毒诸症，故云解毒耳。

Translation: Si Gua Luo enters the channels and collaterals and resolves pathogenic Heat. When Heat is cleared, Wind naturally departs, and the fluids in the collaterals do not congeal into Phlegm or transform into swelling and toxic sores. Hence it is said to resolve toxins.

Historical Context

The history and evolution of Si Gua Luo's use in Chinese medicine over the centuries

The luffa plant is believed to have originated in India and was introduced to China during the late Tang Dynasty. The earliest written record mentioning the use of the luffa sponge appears in the Song Dynasty work Lao Xue An Bi Ji (《老学庵笔记》), which describes using it to scrub ink stains from inkstones without damaging them. This domestic cleaning use persisted for centuries and was also noted by Li Shizhen in the Ben Cao Gang Mu, who recorded that villagers called it "washing-pot gourd" (洗锅罗瓜) because they used the fibrous skeleton to scrub pots and make shoe insoles.

The name "Si Gua Luo" (丝瓜络, literally "silk-gourd network") was first formally used as a medicinal name in the Qing Dynasty text Ben Cao Zai Xin (《本草再新》). Li Shizhen explained the etymology: "When old, its sinews and fibres weave together like a net, hence the name 'silk-thread' gourd." The Ben Cao Gang Mu Shi Yi (《本草纲目拾遗》) recorded the colourful alias "Tian Ku Lou" (天骷髅, "heavenly skull"), referring to its hollow, skeletal appearance with three internal chambers. The classical reasoning for its channel-unblocking action is a beautiful example of "doctrine of signatures" thinking in TCM: because the fibrous network of the old luffa resembles the human body's network of channels and collaterals, it was considered especially suited to treat disorders of the collaterals.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Si Gua Luo

1

Anti-neuroinflammatory and Neuroprotective Effects of Luffa cylindrica Extract on Microglial Activation-Mediated Mild Cognitive Impairment (Preclinical Study, 2025)

Kim JH et al., Effects of Luffa cylindrica (L.) Roem Extract on Microglial Activation-Mediated Mild Cognitive Impairment via Regulation of CREB Signaling Pathway, PubMed, 2025

This study evaluated Luffa cylindrica extract (LCE) in cell and animal models of neuroinflammation-related cognitive impairment. LCE treatment significantly reduced nitric oxide production, pro-inflammatory cytokine expression, and inflammation-associated protein levels in microglial cells. In mice, oral LCE administration improved LPS-induced cognitive impairment and decreased inflammatory markers in the hippocampus. Myricetin was identified as a major active component contributing to the anti-inflammatory effects.

PubMed
2

Ameliorative Effect of Luffa cylindrica Fruits on Alzheimer's Disease-Related Pathology via Autophagy Induction (Preclinical Study, 2023)

Long T, Chen X, Qin DL, Zhu YF, Zhou YJ, He YN, Fu HJ, Tang Y, Yu L, Huang FH, Wang L, Yu CL, Law BYK, Wu JM, Wu AG, Zhou XG. Phytother Res. 2023 Oct;37(10):4639-4654.

Using C. elegans (nematode) and cell models of Alzheimer's disease, researchers found that ethanol extract of Luffa cylindrica fruits inhibited amyloid-beta and tau-induced pathology, including paralysis, reactive oxygen species production, neurotoxicity, and protein deposition. The extract was non-toxic and enhanced the worms' overall health. Its protective effects worked through activation of autophagy (the cell's self-cleaning process), and were weakened when autophagy-related genes were blocked.

3

Immunomodulatory Effects of Two Sapogenins Isolated from Luffa cylindrica in Balb/C Mice (Preclinical Study, 2007)

Bioorg Med Chem Lett. 2007;17(6):1567-1571.

Two triterpenoid sapogenins isolated from Luffa cylindrica were tested for immune-modulating activity in mice. Treatment at three different doses for 15 days showed significant dose-dependent enhancement of multiple immune parameters, including antibody production, delayed-type hypersensitivity response, and macrophage phagocytic activity. The results suggest the plant has immunostimulatory properties.

PubMed
4

Sub-chronic Oral Toxicity Study of the Alkaloid Rich Fraction from Luffa cylindrica Fruit in Sprague-Dawley Rats (Toxicology Study, 2024)

SRM College of Pharmacy, SRMIST. Toxicol Rep. 2024.

This 90-day toxicity study in rats investigated the safety profile of an alkaloid-rich fraction from Luffa cylindrica at doses of 100, 200, and 400 mg/kg/day, followed by a 30-day recovery period. The study confirmed a generally favorable safety profile at the doses tested, supporting the traditional use of the plant as a medicinal agent with low toxicity.

PubMed

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.