Herb

Can Sha

Silkworm feces | 蚕沙

Also known as:

Silkworm Droppings

Can Sha

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Properties

Wind-Damp dispelling herbs (祛风湿药) · Warm

Traditionally supports*

Joint and Muscle Health Digestive Health Skin Health Menstrual Health

Parts Used

Animal — secretion (动物分泌物 dòng wù fēn mì wù)

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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About This Herb

Traditional Chinese Medicine background and properties

Herb Description

Silkworm droppings are the dried feces of the domestic silkworm larva, used in Chinese medicine primarily for joint and muscle pain caused by Wind and Dampness, and for digestive upset with vomiting, diarrhea, and muscle cramping. It is a mild, gentle herb that can also be applied externally for itchy skin conditions.

Herb Category

Wind-Damp dispelling herbs (祛风湿药)

Main Actions

  • Dispels Wind-Dampness
  • Harmonizes the Stomach and transforms turbid Dampness
  • Invigorates Blood and Unblocks the Channels and Collaterals
  • Relieves Itching

How These Actions Work

'Dispels Wind-Dampness' means this herb helps clear the pathogenic factors of Wind and Dampness from the muscles, joints, and channels. In TCM, when Wind and Dampness lodge in the body, they cause joint pain, stiffness, numbness, and heaviness in the limbs. Cán Shā's warm, acrid nature allows it to gently open the channels and push these pathogens out. It is mild enough to be used even in patients who are somewhat weak, and it addresses painful obstruction (bì zhèng) throughout the upper and lower body.

'Harmonizes the Stomach and transforms turbid Dampness' means this herb helps the Stomach and Spleen recover their normal digestive function when turbid Dampness has accumulated in the middle part of the body. This is the scenario seen in acute vomiting and diarrhea (historically described in cholera-like illness), where Dampness clogs the digestive system and disrupts the normal rising and descending of Qi. Cán Shā is uniquely suited because it is described as a 'clear substance within the turbid' (浊中清品), meaning it can penetrate and resolve murky Dampness while restoring clarity to the digestive organs.

'Activates Blood and unblocks the channels' refers to its ability to promote circulation and address menstrual irregularities, particularly absent periods (amenorrhea) and excessive uterine bleeding. This action relates to its channel entry into the Liver, which governs the smooth flow of Blood. Classical formulas used it steeped in wine for these gynecological complaints.

'Relieves itching' refers to its use both internally and as an external wash for itchy rashes and skin conditions caused by Wind-Dampness. Boiling it and using the liquid to bathe affected areas is a longstanding folk remedy for widespread itching and hives.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Can Sha is traditionally associated with these specific patterns.

The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.

Why Can Sha addresses this pattern

Cán Shā is warm in temperature and acrid in taste, giving it the ability to disperse and move through the channels. Its channel entry into the Liver (which governs sinews) and Spleen (which governs muscles and the four limbs) makes it well suited for Wind-Damp painful obstruction (bì zhèng). In this pattern, external Wind and Dampness invade the channels and joints, causing pain, heaviness, numbness, and restricted movement. Cán Shā's warmth dries Dampness while its acrid quality disperses Wind, and its gentle nature makes it appropriate for prolonged use or in patients with underlying deficiency.

A practitioner would look for one or more of these signs

Moving Pain

Pain in multiple joints aggravated by damp weather

Skin Numbness

Numbness or heaviness of the limbs

Muscle Pain

Generalized muscle aches

TCM Properties

Temperature

Warm

Taste

Acrid / Pungent (辛 xīn), Sweet (甘 gān)

Channels Entered
Liver Spleen Stomach
Parts Used

Animal — secretion (动物分泌物 dòng wù fēn mì wù)

This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page

Product Details

Manufacturing, supplier, and product specifications

Product Type

Granules

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Botanical & Sourcing

Quality Indicators

Good quality Can Sha consists of uniformly sized granules that are dry, firm, and dark black in color. Each granule should show a clear hexagonal shape with six distinct longitudinal ridges. The material should feel hard and brittle, snapping cleanly rather than crumbling into powder. It should have a faint, clean grassy scent (from the mulberry leaf content) and a bland taste. Avoid material that is brownish, irregularly shaped, damp, moldy, or mixed with excessive soil, sand, or leaf debris. Uniform granule size indicates consistent collection from the same instar stage.

Primary Growing Regions

Can Sha is produced wherever sericulture (silkworm farming) is practiced in China. The largest and highest-quality production comes from Jiangsu, Zhejiang, and Sichuan provinces, which are the traditional heartland of Chinese silk production. Additional significant production areas include Hunan, Yunnan, and Guangxi provinces. Because Can Sha is an animal byproduct rather than a cultivated plant, its quality depends more on the health of the silkworms, the quality of mulberry leaves used as feed, and proper post-collection processing than on a single terroir region.

Harvesting Season

June to August, primarily collecting droppings from the second to third instar (molting stage) silkworms. Droppings are then sun-dried and winnowed to remove soil and mulberry leaf debris.

Supplier Information

Treasure of the East

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Miscellaneous Info

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Usage & Safety

How to use this herb and important safety information

Important Medical Disclaimer

The information provided here is for educational purposes only and is not intended as medical advice or to replace consultation with a qualified healthcare professional. This herb is a dietary supplement and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease.

Always consult with a qualified healthcare provider, particularly if you are pregnant, nursing, have a medical condition, or are taking other medications. Discontinue use and consult your healthcare provider if you experience any adverse reactions.

Recommended Dosage

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Instructions for safe storage and consumption

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Traditional Dosage Reference

Standard

5-15g

Maximum

Up to 30g in decoction for severe Wind-Damp painful obstruction, under practitioner supervision. External use has no strict upper limit.

Notes

Standard internal dose is 5-15g in decoction. For Wind-Damp painful obstruction (bi syndrome) with joint pain, doses in the range of 10-15g are typical. For harmonizing the Stomach and resolving turbid Dampness in cases of vomiting, diarrhea, and leg cramps, 10-15g is used. Can Sha may also be prepared as a wine infusion (typically around 30g steeped in rice wine) for treating amenorrhea or chronic Wind-Damp pain. For external use, there is no strict dosage limit: the droppings can be decocted into a wash for skin conditions, or stir-fried, placed in cloth bags, and used as warm compresses applied to painful joints or affected areas.

Processing Methods

Processing method

Stir-fried in a dry wok until the color turns slightly yellow and the herb becomes fragrant.

How it changes properties

Stir-frying enhances the warming and drying properties, strengthening its ability to dispel Cold-Dampness. The heat processing also makes it better suited for external application as a warm compress (the ironing method), where it is placed in a cloth bag while still hot and applied to painful joints or the abdomen.

When to use this form

Preferred for external application as a warm compress on painful joints or the abdomen. Also used for the wine-steeping preparation to treat amenorrhea and uterine bleeding, where the enhanced warmth helps activate Blood circulation.

Toxicity Classification

Non-toxic

Can Sha is classified as non-toxic in the Chinese Pharmacopoeia and classical sources. There are no reports of serious adverse reactions at standard doses. Animal toxicity studies on its chlorophyll-derivative extracts (used in photodynamic therapy research) showed that the oral tolerable dose in mice was very high (over 6,600 mg/kg), confirming a wide margin of safety for the crude substance. The main safety consideration is potential allergic reaction in individuals sensitized to silkworm proteins, as silkworms and their metabolites contain identified allergens. Proper storage in a dry, ventilated environment is important to prevent mold contamination.

Contraindications

Caution

Weak Stomach and intestines (Spleen-Stomach deficiency with poor digestion). Can Sha's wind-dispelling and dampness-resolving nature may further tax weak digestion when no dampness pattern is present.

Avoid

Blood deficiency causing limb numbness or impaired movement. Classical sources specifically note that when numbness or paralysis arises from Blood deficiency rather than Wind-Dampness, Can Sha should not be used as it addresses the wrong root cause.

Avoid

Known allergy to silkworm products. Silkworms and their metabolites contain potential allergens that may cause allergic reactions in sensitized individuals.

Special Populations

Pregnancy

Can Sha has Blood-moving and channel-unblocking properties, and classical sources record its use for treating amenorrhea and promoting menstruation. Because of this Blood-activating action, it should be used with caution during pregnancy. While not classified as strongly contraindicated like potent Blood-moving herbs, pregnant women should avoid use unless specifically prescribed by a qualified practitioner who has determined that the benefit outweighs potential risk of stimulating uterine activity.

Breastfeeding

No specific safety data exists for the use of Can Sha during breastfeeding. While it is considered non-toxic at standard doses, its Blood-moving properties warrant some caution. The potential for transfer of allergenic silkworm proteins or active compounds into breast milk has not been studied. Nursing mothers should consult a qualified practitioner before use.

Pediatric Use

Can Sha can be used in children at appropriately reduced doses (typically one-third to one-half of the adult dose, depending on age and body weight). External use as a warm compress or wash is commonly employed for children with skin rashes or itching, and is generally well tolerated. As with all herbal medicines in pediatric use, a qualified practitioner should determine the appropriate dose. Watch for any signs of allergic reaction, particularly in children with known sensitivities to insect products.

Drug Interactions

Can Sha has demonstrated anticoagulant activity in laboratory studies, with water extracts showing anti-thrombin effects that significantly extend human fibrinogen clotting time. Individuals taking anticoagulant or antiplatelet medications (such as warfarin, heparin, or aspirin) should exercise caution, as concurrent use could theoretically potentiate bleeding risk.

No other well-documented pharmaceutical drug interactions have been established. However, given its Blood-activating properties, general caution is advisable when combining with other Blood-thinning agents or supplements.

Dietary Advice

When taking Can Sha for Wind-Damp conditions, avoid cold, raw, and greasy foods that may generate further Dampness and impair Spleen function. Warm, easily digestible foods are preferred. When Can Sha is used for vomiting and diarrhea due to Dampness, bland, plain foods such as congee are most appropriate. Rice wine or warm yellow wine is traditionally used as a vehicle to enhance Can Sha's Wind-Damp dispelling and Blood-moving effects.

Cautions & Warnings

Although this formula is typically safe for most individuals, it may cause side effects in some people. Pregnant women, nursing mothers, postpartum women, and those with liver disease should use the formula with caution.

As with any Chinese herbal remedy, it is advisable to seek guidance from a qualified TCM practitioner before beginning treatment.