Herb

Chen Xiang

Agarwood | 沉香

Also known as:

Aquilaria Wood

Chen Xiang

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Properties

Qi-regulating herbs (理气药) · Slightly Warm

Traditionally supports*

Digestive Health Respiratory Health Abdominal Pain Relief Kidney Health

Parts Used

Resin / Sap (树脂 shù zhī / 汁 zhī)

*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

Chen Xiang (Agarwood) is a rare and aromatic resinous wood prized in Chinese medicine for its ability to relieve abdominal pain and bloating, settle nausea and hiccups, and calm wheezing caused by weak Kidney function. It works by warming the digestive system and directing the body's Qi powerfully downward, making it especially helpful for conditions where things feel stuck or are rising when they should be descending.

Herb Category

Qi-regulating herbs (理气药)

Main Actions

  • Moves Qi and Alleviates Pain
  • Warms the Middle Burner and Stops Vomiting
  • Directs Rebellious Qi Downward and Stops Hiccup
  • Aids the Kidneys in Grasping Qi

How These Actions Work

'Promotes the movement of Qi and alleviates pain' means Chen Xiang helps break up stagnation when Qi gets stuck in the chest or abdomen, causing feelings of fullness, bloating, or pain. Its pungent taste disperses blockages while its warm nature drives out internal cold. This action is especially relevant when cold weather, emotional stress, or dietary factors cause the body's Qi to stall in the middle and lower torso.

'Warms the middle and stops vomiting' refers to Chen Xiang's ability to warm a cold Stomach and restore its natural downward movement. The Stomach's job is to push food downward; when cold disrupts this, food and fluids rebel upward, causing nausea, vomiting, or hiccups. Chen Xiang's bitter taste and heavy, sinking nature redirect this rebellious upward flow back downward, settling the Stomach.

'Warms the Kidneys and helps grasp Qi to calm wheezing' describes one of Chen Xiang's most distinctive functions. In TCM, the Kidneys are supposed to "grasp" or anchor the Qi that the Lungs breathe in. When the Kidneys are weak and cold, they lose this anchoring ability, and Qi floats upward unchecked, causing breathlessness and wheezing where the person can exhale but struggles to inhale deeply. Chen Xiang warms Kidney Yang and, because its nature is heavy and descending, it draws rebellious Qi back down to its root. Classical texts describe it as the foremost herb for directing Qi downward (降气之最).

Patterns Addressed

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

Chen Xiang's pungent, aromatic nature disperses cold that has congealed in the chest and abdomen, while its warm temperature directly counteracts the pathogenic cold causing this pattern. Its bitter taste descends and moves stagnant Qi. Together, these properties break up the combination of cold and Qi blockage that causes distending pain in the chest and belly. The herb enters the Spleen and Stomach channels, placing it precisely where this cold-stagnation pattern tends to lodge.

A practitioner would look for one or more of these signs

Abdominal Pain

Cold, distending pain in the abdomen that improves with warmth

Chest Pain

Sense of fullness and stuffiness in the chest

Post-Surgical Constipation And Bloating

Abdominal bloating worsened by cold food or weather

TCM Properties

Temperature

Slightly Warm

Taste

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

Channels Entered
Spleen Stomach Kidneys
Parts Used

Resin / Sap (树脂 shù zhī / 汁 zhī)

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

The highest quality Chen Xiang (agarwood) is dense, dark, and resin-rich. The gold standard is whether the piece sinks in water (沉水): pieces that sink completely contain the most resin and are the most valuable. Pieces that partially sink (半沉半浮) are of medium grade, while those that float are lower quality (classified historically as "huang shu xiang" or yellow-ripe incense). The surface should show a clear pattern of dark brown-to-black resinous areas interspersed with yellowish-white wood. Good quality pieces have a firm, solid texture and are difficult to break. The fragrance should be distinctly aromatic, complex, and sweet when the piece is gently heated. It should not smell like burnt wood or artificial perfume. When burned, authentic Chen Xiang produces white smoke with visible oil seeping from the surface. The taste is bitter. Per the Chinese Pharmacopoeia, the ethanol-soluble extractives should not be less than 15%. Cross-section examination should show resin-filled ray cells and medullary tissue appearing brown under microscopy.

Primary Growing Regions

The premium dao di (道地药材) source of Chen Xiang is Hainan Island, China, which has been celebrated since the Song dynasty as producing the finest quality agarwood. Li Shizhen praised it in the Ben Cao Gang Mu as "one piece worth ten thousand coins, the best under heaven" (海南沉香，一片万钱，冠绝天下). Other important Chinese producing regions include Guangdong province (particularly the Dongguan area, where the local variety is called "Guan Xiang" or "daughter's fragrance"), Guangxi, and Fujian. Internationally, high-quality agarwood also comes from Vietnam (especially the Nha Trang and Hue An regions), Cambodia, Malaysia, and Indonesia, though these are typically derived from related species such as Aquilaria crassna and A. malaccensis rather than the Chinese Pharmacopoeia species A. sinensis.

Harvesting Season

Year-round (全年均可采收). The resin-containing heartwood can be harvested at any time, though traditionally autumn and winter are preferred because the wood is drier with less moisture and purer fragrance. Trees must be at least 10 to 30 years old before meaningful resin formation occurs, with the highest quality agarwood coming from trees over 200 years old.

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

1-5g

Maximum

Generally should not exceed 5g per dose in decoction. When taken as ground powder or water-ground juice, the typical maximum is 1.5-2g per dose.

Notes

Chen Xiang is a precious and potent aromatic herb used in small doses. For Qi stagnation with chest and abdominal pain, 1-3g is typical. For warming the Middle Burner to stop vomiting, 1-3g is standard. For grasping Kidney Qi to calm wheezing (纳气平喘), 1-5g may be used. When combined with Kidney-tonifying formulas such as a modified Liu Wei Di Huang Wan (as described in the Ben Cao Hui Yan), a small amount of Chen Xiang juice (数分, several fen) is ground separately and stirred into the strained decoction. Higher doses are not more effective and may cause excessive downward movement of Qi, leading to flatulence, poor appetite, and deficiency symptoms with prolonged use.

Processing Methods

Processing method

The resinous wood is filed or ground into a fine powder (过120目以上筛网). Because Chen Xiang's volatile aromatic compounds are destroyed by prolonged boiling, powder form is the preferred processing method for internal use.

How it changes properties

Grinding into powder does not change the thermal nature or taste, but it preserves the aromatic volatile oils that would be lost in decoction. The powder form delivers a stronger Qi-moving and descending effect than decocted pieces.

When to use this form

Most internal uses. Chen Xiang powder (0.5-1g per dose) is typically dissolved in warm water or mixed into a strained decoction just before drinking, rather than being boiled with other herbs. This is the standard clinical method.

Toxicity Classification

Non-toxic

Chen Xiang is classified as non-toxic in both classical sources and the Chinese Pharmacopoeia. The Hai Yao Ben Cao (Tang dynasty) explicitly states it is "without toxicity" (无毒). No toxic components have been identified in the resinous heartwood at standard medicinal doses. Safety studies on Aquilaria extracts in animal models have shown no significant toxic reactions at doses of 2000 mg/kg over 14 days. However, excessive oral consumption may cause gastrointestinal discomfort including abdominal pain and loose stools in sensitive individuals, and prolonged use without appropriate indication may lead to Qi depletion symptoms as warned in classical texts.

Contraindications

Caution

Yin deficiency with Fire flaring (阴虚火旺). Chen Xiang is warm and aromatic, which can further deplete Yin fluids and aggravate internal Heat in those with Yin deficiency patterns. Classical sources such as the Ben Cao Jing Shu specifically warn against its use in this context.

Caution

Qi deficiency with sinking (气虚下陷). Chen Xiang's primary direction is downward-moving, which can worsen conditions where Qi is already collapsing or sinking, such as in severe fatigue with organ prolapse.

Caution

Heat patterns in the Heart channel with excess Fire (心经有实邪). As noted in the Ben Cao Jing Shu, when there is real excess Heat in the Heart, the warming nature of Chen Xiang is inappropriate and may worsen the condition.

Caution

Overuse or prolonged use without appropriate indication. The Ben Jing Feng Yuan warns that Chen Xiang 'descends more than it ascends' and long-term use may lead to excessive downward movement of Qi, manifesting as uncontrollable flatulence, poor appetite, sallow complexion, and various deficiency symptoms.

Special Populations

Pregnancy

Use with caution during pregnancy. Chen Xiang is a Qi-moving aromatic herb, and its downward-directing and Qi-mobilizing actions could theoretically stimulate uterine activity or disturb fetal Qi. Classical and modern Chinese sources consistently list pregnant women (孕妇) as a population that should either avoid or use Chen Xiang with caution. It is not classified as absolutely contraindicated in pregnancy, but should only be used when specifically indicated and under practitioner supervision.

Breastfeeding

No specific classical or modern contraindication exists for Chen Xiang during breastfeeding. However, as an aromatic Qi-moving herb with warming properties, it should be used cautiously and only when clearly indicated. There is insufficient data on whether its volatile components transfer through breast milk. Practitioners generally advise conservative use in nursing mothers, at reduced doses and for limited duration.

Pediatric Use

Chen Xiang may be used in children when specifically indicated for conditions such as Qi stagnation with vomiting or wheezing, but dosage should be reduced proportionally according to age and body weight (typically one-third to one-half the adult dose). Due to the herb's aromatic, warm, and Qi-moving nature, it should be used for short courses only. It is not commonly used as a standalone pediatric herb but appears in paediatric formulas. Avoid use in young children with Yin deficiency or Heat patterns.

Drug Interactions

No well-documented pharmaceutical drug interactions have been established for Chen Xiang through rigorous clinical studies. However, based on its known pharmacological properties, the following theoretical considerations apply:

  • Sedative and CNS-depressant medications: Agarwood extracts have demonstrated sedative and anxiolytic effects in animal models, possibly through GABAergic modulation. Concurrent use with benzodiazepines, barbiturates, or other CNS depressants could theoretically have additive effects.
  • Gastrointestinal motility drugs: Chen Xiang has been shown to inhibit intestinal smooth muscle contraction and reduce acetylcholine-induced gut spasm. This could theoretically interact with prokinetic agents (metoclopramide, domperidone) by opposing their effects, or enhance the effects of antispasmodic medications.
  • Anticoagulant and antiplatelet drugs: While no direct interaction data exists, some chromone and sesquiterpene compounds from agarwood have shown anti-inflammatory activity. Caution may be warranted with concurrent anticoagulant therapy until more data is available.

Clinical interaction data remains limited. Patients on medications should inform their healthcare provider before using Chen Xiang.

Dietary Advice

While taking Chen Xiang, avoid cold and raw foods (ice water, raw salads, cold fruits) as these can counteract its warming, Qi-moving effects and impair Spleen function. Since Chen Xiang warms the Middle Burner and descends Qi, it works best when supported by a diet of warm, easily digestible foods such as congee, soups, and cooked vegetables. Avoid excessively spicy or greasy foods, which can generate additional Heat or Dampness and complicate the clinical picture. Those taking Chen Xiang for Kidney Qi grasping should also limit caffeine and stimulants, which can agitate Qi upward.

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.