Herb

Yi Mu Cao

Motherwort herb | 益母草

Also known as:

Kun Cao (坤草)

Yi Mu Cao

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Properties

Blood-invigorating and stasis-dispelling herbs (活血化瘀药) · Slightly Cool

Traditionally supports*

Menstrual Health Postpartum recovery Women's Health Fluid Retention and Edema Skin Health

Parts Used

Whole plant / Aerial parts (全草 quán cǎo)

*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

Yi Mu Cao, or Chinese motherwort, is one of the most important herbs in Chinese medicine for women's health. Its Chinese name literally means "beneficial herb for mothers," reflecting centuries of use for menstrual irregularity, period pain, and recovery after childbirth. It also promotes urination to reduce swelling and can help clear mild skin conditions linked to Blood Heat.

Herb Category

Blood-invigorating and stasis-dispelling herbs (活血化瘀药)

Main Actions

  • Invigorates Blood and Regulates Menstruation
  • Invigorates Blood and Dispels Stasis
  • Promotes Urination and Reduces Edema
  • Clears Heat and Resolves Toxicity

How These Actions Work

'Invigorates Blood and regulates menstruation' means Yi Mu Cao actively promotes Blood circulation, especially through the uterus and pelvic area. Its acrid taste disperses stagnation while its bitter taste drives Blood downward and outward. This is why it is considered the foremost herb for menstrual disorders caused by Blood stasis, including painful periods, absent periods, and incomplete discharge of lochia (postpartum bleeding). Classical texts call it a "holy herb for Blood" (血家之圣药) because it moves old stagnant Blood without damaging new, healthy Blood.

'Dispels Blood stasis' refers to its ability to break up and clear accumulated old Blood. When Blood stops moving properly, it can cause sharp, fixed pain, dark clots during menstruation, or masses. Yi Mu Cao's combined acrid-dispersing and bitter-draining nature makes it effective for dissolving these stagnant accumulations. This action also extends to traumatic injuries where bruising and internal Blood stasis cause pain.

'Promotes urination and reduces edema' means the herb helps the body eliminate excess fluid through the urinary system. This action is linked to its entry into the Urinary Bladder channel. It is particularly useful when edema (swelling) coexists with Blood stasis, a combination frequently seen in kidney conditions. Modern clinical practice commonly uses it for acute and chronic nephritis with edema.

'Clears Heat and resolves toxins' reflects the herb's slightly cool nature working in the Blood level. It can address skin conditions like rashes, itching, boils, and abscesses where Heat and toxins have entered the Blood. It is used both internally and as a topical wash for sores and carbuncles.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Yi Mu Cao 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 Yi Mu Cao addresses this pattern

Yi Mu Cao is acrid (dispersing), bitter (draining), and slightly cool, entering the Liver and Heart channels that govern Blood. Its acrid nature opens and moves stagnant Blood, while its bitter nature drives downward to expel accumulated stasis. This dual action directly addresses the core pathomechanism of Blood Stasis, where Blood fails to circulate freely and accumulates, causing fixed pain and clotting. As classical sources describe, it "moves stagnant Blood without damaging new Blood" (行血而不伤新血), making it especially suitable for Blood Stasis in the uterus and lower abdomen.

A practitioner would look for one or more of these signs

Painful Menstruation

Menstrual pain with dark clots, pain relieved after clots pass

Amenorrhea

Absent periods due to Blood stasis obstruction

Postmenstrual Bleeding

Prolonged postpartum lochia with abdominal pain

Abdominal Pain

Fixed, stabbing lower abdominal pain

TCM Properties

Temperature

Slightly Cool

Taste

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

Channels Entered
Heart Liver Urinary Bladder
Parts Used

Whole plant / Aerial parts (全草 quán cǎo)

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 dried Yi Mu Cao should have young, tender stems that are yellow-green to gray-green in color, with leaves still attached and, ideally, some flowers present. The stems should be square with four longitudinal grooves, light in weight, and somewhat pliable (not overly woody). The cross-section shows white pith in the center. Leaves should be gray-green, and the small axillary flowers should be pale purple. The aroma is faint and the taste is slightly bitter. Material that is overly mature (thick, woody stems with few leaves and abundant seeds) is considered inferior quality. The freshest, most tender herb yields the highest alkaloid content. Studies have shown that the leonurine content in stored or processed material drops significantly compared to fresh herb, so freshness is an important quality factor. Avoid material that is heavily browned, moldy, or has lost most of its leaves.

Primary Growing Regions

Yi Mu Cao grows widely across nearly all provinces of China and is not strongly associated with a single 'terroir' region (道地药材) in the way that some premium herbs are. It is found throughout temperate and subtropical areas of China, from lowlands up to 3,400 m elevation. Major production areas include Henan, Anhui, Sichuan, Hubei, Jiangsu, Zhejiang, and Guangdong provinces. In southern China, especially Guangdong, fresh young Yi Mu Cao is even eaten as a vegetable. The plant also grows natively in Japan, Korea, and throughout Southeast Asia, and has naturalized in tropical and subtropical regions worldwide.

Harvesting Season

Fresh herb: spring (young seedling stage) through early summer (before flowering). Dried herb: summer, when stems and leaves are lush and flowers have not yet opened or have just begun to open. Material harvested after full bloom or fruit maturation is considered lower quality.

Supplier Information

Treasure of the East

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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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Traditional Dosage Reference

Standard

9-30g (dried herb); 12-40g (fresh herb)

Maximum

Up to 60g under practitioner supervision for acute conditions. Exceeding 60-90g per day risks toxicity symptoms including dizziness, limb numbness, blood pressure drop, and potential kidney damage.

Notes

Use lower doses (9-15g) for mild menstrual irregularity, promoting circulation, and reducing mild edema. Use higher doses (15-30g) for more stubborn Blood stasis conditions such as amenorrhea, severe postpartum blood retention, or significant edema. Fresh herb (12-40g) may be preferred when available, as the active alkaloid content is significantly higher in fresh material compared to stored dried herb. For external use (skin rashes, sores), the herb can be decocted for washing or the fresh juice applied topically without strict dose limits. Do not use continuously for extended periods, especially at higher doses, due to the risk of cumulative kidney stress. Treatment courses should be limited and monitored.

Processing Methods

Processing method

The dried herb segments are mixed with yellow rice wine (huáng jiǔ), allowed to absorb the wine, then stir-fried over gentle heat until dry. Standard ratio: 15kg wine per 100kg herb.

How it changes properties

Wine processing enhances the herb's ability to invigorate Blood, dispel stasis, and relieve menstrual pain. Wine is warm in nature and has an ascending, dispersing quality that strengthens the herb's Blood-moving action and helps guide it through the channels. The slightly cool nature of the raw herb is somewhat moderated.

When to use this form

Preferred when the primary goal is treating Blood stasis menstrual pain, amenorrhea, or postpartum stasis. The wine-processed form has a stronger Blood-invigorating effect than the raw herb, making it the form of choice for stubborn Blood stasis conditions.

Toxicity Classification

Slightly toxic

Yi Mu Cao contains alkaloids including leonurine (益母草碱) and stachydrine (水苏碱), which are responsible for both its therapeutic effects and its toxicity at high doses. Within the standard dosage range of 9-30g, the herb is generally safe. However, at excessive doses (reported above 60-90g in a single day), toxicity symptoms can occur: dizziness, fatigue, chest tightness, numbness in the limbs, profuse sweating, and a drop in blood pressure. In severe cases, paralysis of the lower limbs, respiratory depression, and circulatory collapse have been reported. Modern research has identified dose-dependent kidney toxicity as the most clinically significant concern. The damage primarily affects the renal medulla, manifesting as interstitial fibrosis, capillary dilation, and renal tubular atrophy. This kidney damage is mostly reversible with cessation of the herb and is strongly correlated with dosage, making proper dose control the key to safe use. Animal studies have also shown potential liver toxicity (hepatocyte vacuolization) with prolonged high-dose administration. Controlling dosage and duration of use, and avoiding the herb in patients with pre-existing kidney or liver disease, are essential safety measures.

Contraindications

Avoid

Pregnancy: Yi Mu Cao strongly promotes blood circulation and has a demonstrated ergot-like uterotonic effect that causes uterine contractions, increasing the risk of miscarriage or premature labor.

Avoid

Active heavy menstrual bleeding (menorrhagia) or uterine hemorrhage (Blood collapse / 血崩): the herb's blood-moving properties can worsen excessive bleeding.

Caution

Blood deficiency without stasis: in patients who are Blood-deficient with pale complexion, fatigue, and scanty pale menses, using this strongly blood-moving herb without Blood-nourishing support can further deplete Blood and worsen the condition.

Caution

Yin deficiency with insufficient Blood: classical sources warn against using Yi Mu Cao when there is 'Blood deficiency and a frail constitution, or Liver deficiency with dilated pupils' (肝虚血少，瞳仁散大者).

Caution

Pre-existing kidney disease or impaired renal function: modern research has identified a dose-dependent risk of renal tubular damage, primarily affecting the renal medulla, particularly with prolonged or high-dose use.

Caution

Spleen and Stomach deficiency with loose stools: the herb is bitter, acrid, and slightly cold, which can further injure a weak digestive system. Classical texts note it should not be used when the 'Spleen and Stomach are not substantial and the Large Intestine is not firm.'

Caution

During menstruation in women with normal or heavy flow: the herb can increase menstrual volume and prolong bleeding time due to its anti-platelet aggregation effects.

Special Populations

Pregnancy

Contraindicated during pregnancy. Yi Mu Cao has a well-documented ergot-like uterotonic effect: its primary alkaloid leonurine stimulates uterine smooth muscle, increasing contraction strength and frequency. This can increase the risk of miscarriage in early pregnancy and premature labor in later stages. The Chinese Pharmacopoeia explicitly states that Yi Mu Cao is prohibited for use by pregnant women (孕妇禁用). This is consistent with classical warnings and the herb's fundamental action of strongly moving Blood and dispelling stasis. Interestingly, an animal developmental toxicity study of isolated leonurine at high doses (up to 2000 mg/kg) found no significant teratogenicity, but the whole herb contains multiple active compounds that act synergistically on the uterus, and clinical safety in human pregnancy has not been established.

Breastfeeding

Use with caution during breastfeeding. While Yi Mu Cao is traditionally used in the postpartum period to help clear retained blood (lochia) and promote uterine recovery, it should only be used under practitioner guidance during breastfeeding. The herb's alkaloids (leonurine, stachydrine) may transfer into breast milk, but specific data on breast milk excretion is limited. The herb's slightly cold nature and blood-moving properties could theoretically affect the nursing infant's digestion. Short-term use for specific postpartum conditions under professional supervision is generally considered acceptable, but prolonged unsupervised use should be avoided.

Pediatric Use

Yi Mu Cao is primarily used for gynecological conditions and has limited application in pediatric practice. When used in children for other indications (such as edema or skin conditions), dosage should be reduced proportionally based on age and body weight, typically to one-third to one-half of the adult dose. It is generally not appropriate for very young children or infants. Any pediatric use should be under the direct supervision of a qualified practitioner.

Drug Interactions

Anticoagulants and antiplatelet drugs (e.g. warfarin, heparin, aspirin, clopidogrel): Yi Mu Cao has demonstrated anti-platelet aggregation activity and blood-viscosity-lowering effects through its alkaloid components. Concurrent use with anticoagulant or antiplatelet medications may increase the risk of bleeding. Close monitoring of coagulation parameters is advised if co-administration is unavoidable.

Antihypertensive medications: Leonurine has vasodilatory effects and can lower blood pressure. Combined use with antihypertensive drugs may cause an additive hypotensive effect, potentially leading to dizziness, fainting, or dangerously low blood pressure.

Oxytocin and other uterotonic agents: Yi Mu Cao has ergot-like uterotonic activity. If used together with pharmaceutical uterotonic agents (such as oxytocin or methylergometrine), the combined uterine stimulating effect may be excessive, increasing the risk of uterine hyperstimulation.

Dietary Advice

Because Yi Mu Cao is slightly cold in nature, it is best to avoid excessive consumption of cold, raw foods while taking it to prevent further chilling the digestive system. This is especially important for individuals with a tendency toward Spleen-Stomach cold or weakness. Warm, easily digestible, Blood-nourishing foods (such as cooked dark leafy greens, red dates, and well-cooked grains) are supportive when using this herb for menstrual or postpartum conditions. Avoid alcohol, which can intensify the herb's blood-moving effects and increase the risk of excessive bleeding.

Cautions & Warnings

Although this herb 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.