Herb

Rou Dou Kou

Nutmeg seed | 肉豆蔻

Also known as:

Rou Guo (肉果) , Yu Guo (玉果)

Rou Dou Kou

Product appearance may vary from images shown

Properties

Astringent / Stabilizing herbs (收涩药) · Warm

Traditionally supports*

Digestive Health Chronic Diarrhea Abdominal Pain Relief Gut Health

Parts Used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

*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.

Select Product Type

Select Supplier

Select Size

Quantity

$63.00 ($0.63/g)
For shipments to: United States Change
Standard Shipping (3-5 business days): $4.99
Express Shipping (1-2 business days): $9.99
Free shipping on orders over $75

About This Herb

Traditional Chinese Medicine background and properties

Herb Description

Nutmeg seed is a warming digestive herb prized in Chinese medicine for stopping chronic diarrhea and easing cold-related stomach pain and bloating. It is best known as a key ingredient in formulas for early-morning diarrhea caused by weakness of the Spleen and Kidneys, and is almost always used in its roasted (processed) form to remove excess oils and reduce potential irritation.

Herb Category

Astringent / Stabilizing herbs (收涩药) Herbs that astringe the Lungs and bind the intestines (敛肺涩肠药)

Main Actions

  • Regulates Qi and Harmonizes the Middle Burner
  • Astringes the Intestines and Stops Diarrhea
  • Warms the Interior and Dispels Cold
  • Promotes Digestion and Resolves Food Stagnation

How These Actions Work

'Warms the Middle Jiao and moves Qi' means Rou Dou Kou uses its warm, pungent, and aromatic nature to heat the digestive centre (Spleen and Stomach) and disperse cold accumulation. When cold stagnates in the abdomen, it blocks the normal flow of Qi, leading to distending pain, nausea, and vomiting. The herb's aromatic quality 'awakens' the Spleen and gets digestive Qi moving again. This is the action at work when it is used for cold-type stomach and abdominal pain with bloating and poor appetite.

'Astringes the intestines and stops diarrhea' is the action Rou Dou Kou is most famous for. In TCM, chronic or dawn diarrhea often results from the Spleen and Kidneys being too cold and weak to 'hold' digested material in the intestines. Rou Dou Kou has a binding, astringent quality that tightens the intestines and prevents this slippage. This is why the herb is considered a key remedy for long-standing, watery diarrhea that will not resolve, not for acute diarrhea caused by infection or heat.

'Promotes digestion and resolves food stagnation' refers to the herb's ability to stimulate the Stomach's digestive function through its warm aromatic properties. Classical sources describe it as 'opening the Stomach' and 'descending Qi', meaning it helps food move through the digestive system rather than sitting and fermenting. This applies in cases of poor appetite, undigested food in the stool, and a heavy feeling after eating.

Patterns Addressed

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

When both the Spleen and Kidney Yang are deficient, the 'fire of the Gate of Vitality' (Kidney Yang) can no longer warm the Spleen to transform food and fluids. This leads to the characteristic 'fifth-watch diarrhea' (early-morning diarrhea around 3-5 AM), when Yin is at its peak and the already-weak Yang cannot mount a response. Rou Dou Kou's warm, pungent nature directly addresses this by warming the Spleen and Stomach while its astringent quality binds the intestines. As a classical teaching notes, 'warming the Spleen is also warming the Kidney' (温脾即以温肾), making Rou Dou Kou effective for both the middle and lower Jiao. It is the Deputy herb in Si Shen Wan specifically for this pattern.

A practitioner would look for one or more of these signs

Diarrhea

Characteristic 'cock-crow' diarrhea around dawn

Loose Stools

Watery stools with undigested food

Cold Limbs

Cold extremities from Yang deficiency

Poor Appetite

Reduced appetite and food intake

Eye Fatigue

Tiredness and lack of strength

TCM Properties

Temperature

Warm

Taste

Acrid / Pungent (辛 xīn)

Channels Entered
Spleen Stomach Large Intestine
Parts Used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

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

Quantity Description

Loading quantity information...

Concentration Ratio

Loading concentration information...

Fabrication Method

Loading fabrication information...

Supplier Certifications

Loading certifications information...

Botanical & Sourcing

Quality Indicators

Good quality Rou Dou Kou kernels should be large, heavy, firm, and solid, with an oval or egg-like shape. The surface should be greyish-brown to greyish-yellow in colour with a network of fine wrinkles. When broken open, the cross-section should display a distinctive marbled pattern of dark brown and creamy white veins (resembling betel nut), with visibly oily content. The aroma should be strong, warm, and distinctly aromatic with a pungent, slightly bitter taste. The richness of the oil (which can be seen glistening on the cut surface) is a key marker of quality. Avoid kernels that are shrivelled, lightweight, dry and pale (枯白瘦虚), worm-eaten, or lacking in aroma. Be wary of unnaturally bright-coloured specimens, which may have been sulfur-fumigated.

Primary Growing Regions

Rou Dou Kou is native to the Maluku Islands (Moluccas) of Indonesia and is not indigenous to China. The primary producing regions are Indonesia (especially the Banda Islands and eastern Java) and Malaysia, which are considered the premier sources (dao di) for this herb. It is also cultivated in Grenada, India, Sri Lanka, and other tropical regions. In China, small-scale cultivation occurs in Guangdong, Yunnan, and Taiwan, though most medicinal supply continues to rely on Southeast Asian imports, as has been the case since the Tang Dynasty.

Harvesting Season

Harvested twice yearly: once from April to June and again from November to December, when the fruits are mature. Ripe fruits are picked in the morning, the pericarp is split open, the red aril (mace) is peeled away, and the hard shell is cracked to extract the seed kernel.

Supplier Information

Treasure of the East

Loading supplier information...

Loading supplier attributes...

Miscellaneous Info

No additional information available

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

Loading dosage information...

Instructions for safe storage and consumption

Loading storage and consumption information...

Traditional Dosage Reference

Standard

3–9g

Maximum

Up to 10g in decoction under practitioner supervision. Do not exceed standard doses, as myristicin in raw nutmeg powder becomes psychoactive above approximately 5g.

Notes

Use lower doses (3-5g) when primarily seeking Qi-moving and warming effects for Stomach cold with bloating and poor appetite. Use higher doses (6-9g) when the primary goal is astringent action to stop chronic diarrhea, particularly in formulas like Si Shen Wan for pre-dawn diarrhea. Always use the processed (bran-roasted, 煨) form rather than the raw herb, as processing reduces the volatile oil content and potential for gastrointestinal irritation while enhancing the astringent effect. Excessive use may overconsume Qi, as noted by the Song Dynasty physician Kou Zongshi: "It is also good at descending Qi; too much intake will drain Qi."

Processing Methods

Processing method

The nutmeg seed is wrapped in flour dough (or its surface is moistened and coated with 3-4 layers of flour), then roasted in heated talcum powder or sand until the flour crust turns golden-brown. The crust is removed and the seed is cooled. Alternative methods include roasting with wheat bran (麦麸煨) or embedding in hot ashes wrapped in flour until charred on the outside. Per 100kg of nutmeg, approximately 50kg of flour or 40kg of wheat bran is used.

How it changes properties

Processing removes a significant portion of the volatile oils (reduced by approximately 25-27%), particularly the potentially toxic myristicin and safrole. The raw herb contains abundant fatty oils that can have an irritating, paradoxically loosening effect on the bowels. Roasting eliminates this 'slippery intestine' side effect and strengthens the astringent, intestine-binding action. The thermal nature remains warm, but the overall effect shifts from having both dispersing and binding qualities to being predominantly binding and consolidating.

When to use this form

This is the standard clinical form, used in nearly all prescriptions. Raw Rou Dou Kou is almost never prescribed internally because its oils can cause nausea and loose stools, the opposite of the desired effect. Whenever a formula calls for Rou Dou Kou, the roasted form is assumed unless otherwise specified.

Toxicity Classification

Non-toxic

Rou Dou Kou is classified as non-toxic in standard Chinese Pharmacopoeia entries, though some traditional sources note it has slight toxicity (小毒). Its key volatile constituents include myristicin, elemicin, and safrole. When raw nutmeg powder is consumed in large amounts (above approximately 5g, far exceeding normal TCM decoction doses of 3-9g), myristicin can cause psychoactive and neurotoxic effects including nausea, dizziness, hallucinations, confusion, tachycardia, and in extreme cases organ failure. These effects are dose-dependent and typically appear 1-7 hours after ingestion. In standard TCM practice, safety is ensured through two mechanisms: (1) the herb is always processed by roasting wrapped in flour or bran (麸煨), which reduces the volatile oil content and associated irritation; (2) decoction doses are kept within the 3-9g range, which is well below toxic thresholds. Classical texts specifically instruct to avoid contact with iron during processing (勿令犯铁). At standard medicinal doses, Rou Dou Kou has a long history of safe use.

Contraindications

Avoid

Damp-Heat diarrhea or dysentery. Rou Dou Kou is warm, drying, and astringent, which would trap Heat and worsen the condition in patterns involving damp-heat in the intestines.

Avoid

Yin deficiency with Fire flaring (signs like night sweats, hot flashes, dry mouth). The warm, drying nature of this herb would further damage Yin fluids and aggravate internal Heat.

Avoid

Constipation or dry stools. The astringent nature of Rou Dou Kou binds the intestines and would worsen constipation.

Avoid

Acute diarrhea from food poisoning or excess patterns. Using an astringent herb in this situation would trap the pathogen inside and prevent the body from expelling it.

Caution

Large doses should be avoided, as the active compound myristicin can cause neurological symptoms including dizziness, drowsiness, hallucinations, and confusion when consumed in excess (above approximately 5g of raw nutmeg powder). Standard TCM decoction doses are safe.

Caution

Do not use the raw, unprocessed form internally. Classical texts specify that Rou Dou Kou should be prepared by roasting wrapped in flour or bran (煨制) before internal use, which reduces the volatile oil content and potential for irritation.

Special Populations

Pregnancy

Not explicitly listed among the classical pregnancy-prohibited or pregnancy-cautious herbs. However, myristicin (the primary volatile component) has known psychoactive properties at high doses, and safety data during pregnancy is lacking. The warm, aromatic, Qi-moving nature of the herb warrants caution. It should be used during pregnancy only when clearly indicated and at the lowest effective dose, under practitioner supervision. Avoid in early pregnancy when the fetus is most vulnerable.

Breastfeeding

No specific classical or modern contraindication during breastfeeding. However, volatile compounds such as myristicin may transfer into breast milk. Given the lack of safety data, use with caution during breastfeeding and only at standard therapeutic doses under practitioner guidance. Discontinue if the infant shows any signs of irritability or digestive disturbance.

Pediatric Use

Classical sources specifically mention Rou Dou Kou for childhood conditions such as vomiting, failure to keep down milk, and infantile diarrhea. In pediatric use, dosages should be reduced proportionally by age and body weight (typically one-third to one-half of the adult dose for young children). Always use the processed (roasted/bran-fried) form, never the raw herb. It should only be used for clear cold-deficiency patterns with diarrhea in children, not for acute infectious diarrhea which is more common in pediatric patients.

Drug Interactions

MAO Inhibitors (MAOIs): Myristicin, the primary volatile compound in nutmeg, has weak monoamine oxidase inhibitory properties. Concurrent use with MAOI antidepressants (such as phenelzine, isocarboxazid, tranylcypromine, or selegiline) should be avoided due to the theoretical risk of potentiated psychoactive effects and hypertensive crisis.

SSRI Antidepressants: Due to the serotonergic activity of myristicin metabolites (which are structurally related to MDMA/amphetamine derivatives), caution is warranted when combining Rou Dou Kou with SSRI medications, as there is a theoretical risk of serotonin syndrome.

Sedatives and CNS Depressants: Nutmeg extracts have demonstrated sedative and hypnotic-potentiating effects in animal studies. Combined use with benzodiazepines, barbiturates, or other sedative medications may result in excessive drowsiness.

Cytochrome P450 Substrates: Myristicin has been shown to inhibit certain cytochrome P450 enzymes in laboratory studies, which could theoretically alter the metabolism of drugs processed through these pathways. Clinical significance at standard TCM doses is uncertain but warrants monitoring.

Dietary Advice

Avoid cold, raw, and greasy foods while taking Rou Dou Kou, as these oppose its warming, Spleen-strengthening action and may worsen diarrhea. Warm, easily digestible foods such as congee, cooked grains, and soups are ideal accompaniments. Rou Dou Kou is itself a culinary spice and is commonly used in meat stews, curries, and spice blends (such as Chinese five-spice powder and thirteen-spice blends), making it easy to incorporate into the diet for mild digestive support.

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.