Herb Rhizome (根茎 gēn jīng)

Xiang Fu

Nutgrass rhizome · 香附

Cyperus rotundus L. · Rhizoma Cyperi

Also known as: Xiang Fu Zi (香附子), Sha Cao Gen (莎草根), Xiang Fu Mi (香附米),

Xiang Fu (Nutgrass rhizome) plant

Images shown are for educational purposes only

Xiang Fu is one of the most important Qi-moving herbs in Chinese medicine, prized for its ability to relieve emotional tension, digestive discomfort, and menstrual problems. It works by smoothing the flow of Qi throughout the body, particularly in the Liver, and has been called the 'leading general for women's ailments' in classical texts. It is gentle and balanced in nature, making it suitable for a wide range of conditions where stress, frustration, or stagnation is the underlying issue.

Category Qi-regulating herbs (理气药)
Therapeutic focus Menstrual Health Stress and Anxiety Digestive Health Breast Health

TCM Properties

Temperature

Neutral

Taste

Acrid / Pungent (辛 xīn), Bitter (苦 kǔ), Sweet (甘 gān)

Channels entered

Liver, Spleen, San Jiao (Triple Burner)

Parts used

Rhizome (根茎 gēn jīng)

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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 Xiang Fu does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Xiang Fu is primarily used to support these areas of health:

Menstrual Health Stress and Anxiety Digestive Health Breast Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Xiang Fu performs to restore balance in the body:

Soothes the Liver and Regulates Qi Regulates Qi and Broadens the Middle Burner Regulates Menstruation and Alleviates Pain

How these actions work

'Spreads and regulates Liver Qi' is Xiang Fu's most important action and the one it is most famous for. When the Liver's natural function of keeping Qi flowing smoothly is disrupted (often by emotional stress, frustration, or anger), Qi becomes stuck or stagnant. This shows up as a feeling of tightness or distension in the chest and flanks, mood swings, irritability, sighing, or a sensation of something being 'blocked.' Xiang Fu's acrid, aromatic nature allows it to move and spread, while its slight bitterness helps it descend. Together these qualities make it exceptionally effective at unblocking stuck Liver Qi. The Ben Cao Gang Mu called it the 'chief commander for all Qi diseases and the leading general for women's ailments' (气病之总司，女科之主帅).

'Regulates Qi and loosens the chest' means Xiang Fu can also address Qi stagnation in the Spleen and Stomach. When Qi stalls in the middle of the body, it produces bloating, epigastric fullness, poor appetite, belching, or nausea. Because Xiang Fu enters both the Liver and Spleen channels, it smooths the flow of Qi across both organs, which is especially useful when Liver Qi 'invades' the Stomach or Spleen, causing digestive upset alongside emotional distress.

'Regulates menstruation and alleviates pain' reflects Xiang Fu's special importance in gynecology. Smooth Qi flow is essential for regular, pain-free menstruation. When Liver Qi stagnation disrupts the flow of Blood in the uterus, the result can be irregular periods, painful cramping, premenstrual breast tenderness, or missed periods. By restoring Liver Qi movement, Xiang Fu helps Blood circulate properly, which is why it appears in so many classical formulas for menstrual disorders. It is often described as a 'Qi-level herb that works within the Blood' (血中气药), meaning it addresses Blood-related problems by first resolving the underlying Qi stagnation.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Xiang Fu is used to help correct these specific patterns.

Why Xiang Fu addresses this pattern

Liver Qi Stagnation is the pattern most closely associated with Xiang Fu. When emotional stress, frustration, or repressed anger causes the Liver to lose its smooth-flowing nature, Qi becomes stuck. Xiang Fu's acrid taste disperses and moves, while its slight bitterness helps descend stuck Qi. It enters the Liver channel directly, making it the foremost herb for unblocking Liver Qi. Its neutral temperature means it can be used regardless of whether the stagnation has a warm or cool tendency, without risk of adding Heat or Cold.

A practitioner would look for one or more of these signs

Chest Stiffness

Distension and fullness in the chest and ribcage area

Irritability

Mood swings, irritability, or a feeling of emotional frustration

Hypochondriac Pain

Pain or distension along the flanks beneath the ribs

Frequent Bleeding

Frequent sighing as an unconscious attempt to release stuck Qi

Commonly Used For

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

Arises from: Qi Stagnation Liver Qi Stagnation

TCM Interpretation

TCM views painful menstruation primarily as a problem of obstructed flow. The uterus depends on the smooth movement of both Qi and Blood for a painless menstrual cycle. When the Liver fails to keep Qi flowing freely (often due to emotional stress, frustration, or suppressed anger), Qi stagnates in the lower abdomen. Because Qi drives Blood, stagnant Qi leads to sluggish Blood movement. Before and during menstruation, this manifests as cramping pain, clotting, and premenstrual tension. The pain is typically worse with stress and better with warmth or after the flow begins. The Liver channel itself passes through the lower abdomen and pelvic region, making this organ system directly relevant to uterine function.

Why Xiang Fu Helps

Xiang Fu is the single most important herb in Chinese medicine for Qi-stagnation-type dysmenorrhea. Its acrid, aromatic nature powerfully moves stuck Liver Qi, while its classical designation as a 'Qi-level herb within the Blood' means it reaches the Blood level indirectly by restoring Qi flow. It enters the Liver channel (the channel most directly involved in menstrual regulation) and the San Jiao (Triple Burner), which governs the waterways and passages in the lower body. By unblocking the root Qi stagnation, Xiang Fu allows Blood to circulate through the uterus normally, reducing cramping and clotting. Modern pharmacological research confirms that Xiang Fu extracts have antispasmodic effects on uterine smooth muscle and analgesic activity, supporting its traditional use.

Also commonly used for

Irregular Menstruation

Liver Qi stagnation disrupting menstrual timing

Premenstrual Syndrome

Breast distension, mood swings, and irritability before menses

Dyspepsia

Bloating, poor appetite, and fullness from Qi stagnation

Irritable Bowel Syndrome

Stress-related digestive symptoms with abdominal distension

Intercostal Neuralgia

Ribcage pain from Qi stagnation along the Liver channel

Epigastric Pain Relieved With Pressure Or Eating

Cold-type or stress-related stomach pain, especially with Liang Fu Wan

Endometriosis

Emerging research on anti-inflammatory effects for endometriosis pain

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

Acrid / Pungent (辛 xīn), Bitter (苦 kǔ), Sweet (甘 gān)

Channels Entered

Liver Spleen San Jiao (Triple Burner)

Parts Used

Rhizome (根茎 gēn jīng)

Dosage & Preparation

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

Standard dosage

6-10g

Maximum dosage

Up to 15g in severe Qi stagnation, under practitioner supervision. Standard range of 6-10g should not be routinely exceeded.

Dosage notes

The standard decoction dose is 6 to 10g. For mild Qi stagnation with emotional constraint, the lower range (6g) is usually sufficient. For significant menstrual pain or severe epigastric/abdominal distension, doses toward 10g or slightly above may be used. Processing method affects the dosage strategy: vinegar-processed Xiang Fu (Cu Xiang Fu) is preferred for pain and stagnation, particularly menstrual pain; wine-processed (Jiu Xiang Fu) is preferred for coursing through the channels; raw/unprocessed Xiang Fu is used when the target is the upper body or exterior. The aromatic oils that give Xiang Fu its therapeutic action are somewhat volatile, so it should not be decocted for excessively long periods.

Preparation

Xiang Fu should not be decocted for excessively long periods, as its key therapeutic volatile oils are aromatic and may be lost with prolonged boiling. When included in a multi-herb formula, it is best added in the last 10 to 15 minutes of decoction rather than the full cooking time. This preserves the aromatic Qi-moving compounds that give the herb its primary clinical effect.

Processing Methods

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

Processing method

The raw herb is stir-fried with rice vinegar until dry and slightly yellow, or cooked with diluted vinegar until the liquid is absorbed, then steamed for about 5 hours and dried. The standard ratio is 20 kg rice vinegar per 100 kg of Xiang Fu.

How it changes properties

Vinegar processing directs the herb more strongly into the Liver channel and significantly enhances its pain-relieving and Liver-soothing actions. It also adds a capacity to break up food stagnation and accumulations. The overall Qi-regulating effect becomes more focused and penetrating. Modern research confirms that vinegar-processed Xiang Fu has stronger antispasmodic and analgesic effects than the raw form.

When to use this form

The most commonly used processed form in clinical practice. Choose it over raw Xiang Fu when the primary goal is to soothe the Liver and stop pain, particularly for epigastric pain, menstrual cramps, and Liver Qi stagnation with food stagnation. It is the standard form used in most internal medicine formulas.

Common Herb Pairs

These ingredients are traditionally combined with Xiang Fu for enhanced therapeutic effect

Chuan Xiong
Chuan Xiong Xiang Fu 2 : Chuan Xiong 1 (classical headache formula uses Xiang Fu 120g : Chuan Xiong 60g)

Xiang Fu moves Qi while Chuan Xiong moves Blood. Together they address both Qi stagnation and Blood stasis simultaneously. Both are classified as 'Qi herbs within the Blood' (血中气药) and together they 'resolve all types of stagnation' (总解诸郁). This pairing also effectively treats Qi-stagnation headaches, as Chuan Xiong ascends to the head while Xiang Fu regulates the underlying Liver Qi.

When to use: Headaches from Liver Qi stagnation, dysmenorrhea with both Qi and Blood stasis, or as part of Yue Ju Wan for multiple types of stagnation.

Gao Liang Jiang
Gao Liang Jiang 1:1 for mixed cold-and-stress pain; 2:1 Gao Liang Jiang : Xiang Fu if cold predominates; 1:2 if stress predominates

Gao Liang Jiang (galangal) is hot and disperses Cold in the Stomach, while Xiang Fu moves Qi and soothes the Liver. One warms, the other moves. Together they address the combined pathology of Cold congealing and Qi stagnating in the Stomach, which neither herb resolves as well alone. This is the classical pair in Liang Fu Wan.

When to use: Stomach pain aggravated by cold food or cold weather, especially when also linked to emotional stress. Epigastric pain that improves with warmth and worsens with anger or frustration.

Dang Gui
Dang Gui 1:1 (typically Xiang Fu 10g : Dang Gui 10g)

Xiang Fu regulates Qi in the Liver while Dang Gui nourishes and invigorates Blood. Since Qi drives Blood, this pair works synergistically: Xiang Fu removes the Qi-level obstruction while Dang Gui replenishes and moves Blood directly. Together they treat both the cause (Qi stagnation) and effect (Blood deficiency or stasis) of menstrual disorders.

When to use: Dysmenorrhea, irregular menstruation, or amenorrhea from combined Qi stagnation and Blood deficiency or stasis. Premenstrual breast tenderness with scanty periods.

Chai Hu
Chai Hu 1:1 (typically 6g each)

Both herbs regulate Liver Qi, but through different mechanisms. Chai Hu lifts and disperses Liver Qi upward and outward (and also clears Shaoyang-level pathogens), while Xiang Fu moves Qi laterally and downward through the Liver channel, flanks, and lower abdomen. Together they provide a more complete resolution of Liver Qi stagnation across the entire body.

When to use: Liver Qi stagnation with pronounced flank pain, emotional frustration, chest tightness, and digestive upset. The core combination in Chai Hu Shu Gan San.

Zi Su Ye
Zi Su Ye Xiang Fu 2 : Zi Su Ye 1

Zi Su Ye (perilla leaf) releases the exterior and warms the middle, while Xiang Fu moves interior Qi stagnation. Together they address the common clinical scenario of catching a cold (exterior wind-cold) while also having pre-existing Qi stagnation causing chest stuffiness and poor appetite. The pairing forms the core of Xiang Su San.

When to use: Common cold (wind-cold type) in someone who also has chest tightness, epigastric fullness, or poor appetite. Particularly useful when external illness and internal Qi constraint overlap.

Key Formulas

These well-known formulas feature Xiang Fu in a prominent role

Yue Ju Wan 越鞠丸 King

Yue Ju Wan (Escape Restraint Pill) from Zhu Danxi's Dan Xi Xin Fa is the definitive formula for treating the 'six stagnations' (Qi, Blood, Phlegm, Fire, Dampness, Food). Xiang Fu serves as King herb to resolve Qi stagnation, the root cause from which all other types of stagnation arise. This formula perfectly showcases Xiang Fu's core identity as the chief Qi-regulating herb in Chinese medicine.

Xiang Su San 香蘇散 King

Xiang Su San (Cyperus and Perilla Powder) from the Tai Ping Hui Min He Ji Ju Fang treats wind-cold exterior patterns complicated by internal Qi stagnation. Xiang Fu serves as King alongside Zi Su Ye, demonstrating its ability to regulate Qi in the chest and middle burner during common colds, especially when accompanied by chest stuffiness and poor appetite.

Chai Hu Shu Gan San 柴胡疏肝散 Deputy

Chai Hu Shu Gan San (Bupleurum Powder to Spread the Liver) from the Yi Xue Tong Zhi is the representative formula for Liver Qi stagnation with flank pain. Xiang Fu serves as Deputy to Chai Hu, entering the Liver channel to enhance Qi-moving and pain-relieving effects. This formula demonstrates Xiang Fu's role as the ideal partner herb in Liver-soothing prescriptions.

Liang Fu Wan 良附丸 Deputy

Liang Fu Wan (Galangal and Cyperus Pill) from the Liang Fang Ji Yi is a simple two-herb formula pairing Gao Liang Jiang with Xiang Fu. It showcases Xiang Fu's Qi-moving action in the Stomach, complementing Gao Liang Jiang's warming effect to treat cold-type gastric pain with Qi stagnation. The flexible dosage ratio (adjusted based on whether cold or Qi stagnation predominates) highlights Xiang Fu's versatile clinical use.

Comparable Ingredients

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

Mu Xiang
Xiang Fu vs Mu Xiang

Both are leading Qi-regulating herbs, but they target different areas. Xiang Fu primarily enters the Liver channel and excels at soothing Liver Qi stagnation, emotional constraint, and menstrual disorders. Mu Xiang primarily enters the Spleen, Stomach, and Large Intestine channels and excels at moving Qi in the digestive tract to relieve abdominal pain, diarrhea, and tenesmus. For digestive Qi stagnation without Liver involvement, Mu Xiang is preferred. For Liver-related Qi stagnation (emotional, menstrual, flank pain), Xiang Fu is the better choice.

Chai Hu
Xiang Fu vs Chai Hu

Both regulate Liver Qi, but Chai Hu is cool and ascending, making it suited for Shaoyang patterns with alternating chills and fever, or for raising sunken Yang Qi. Xiang Fu is neutral and moves Qi more broadly across the middle and lower body, making it better for chronic Liver Qi stagnation with menstrual, digestive, or emotional symptoms without exterior pathology. Chai Hu also resolves exterior patterns, while Xiang Fu does not.

Qing Pi
Xiang Fu vs Qing Pi

Both enter the Liver channel and move stagnant Qi, but Qing Pi is more forceful and harsh, with a strongly descending, breaking action that can scatter Liver Qi accumulations and reduce hard masses. Xiang Fu is gentler and more broadly regulating, suited for chronic, mild-to-moderate Qi stagnation and long-term use. Qing Pi is chosen when Qi stagnation is severe or has formed palpable masses, but should be used cautiously in patients with Qi deficiency because of its strongly dispersing nature.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Xiang Fu

Xiang Fu (Cyperus rotundus) can be confused with the closely related Cyperus esculentus (yellow nutsedge, known as 'You Sha Cao'), which has similar tubers but lacks the characteristic aromatic fragrance and has a sweeter, nuttier taste. The tubers of C. esculentus are rounder, lighter in color, and less fibrous. Another potential confusion is with Sha Cao Gen (the broader aerial parts of the plant rather than the specific rhizome tubers), which has weaker therapeutic effect. Authentic Xiang Fu should be clearly aromatic, firmly textured, and spindle-shaped with visible ring nodes. When purchasing, verify the characteristic strong fragrance and slightly bitter taste. Regional varieties (Dong Xiang Fu from Shandong, Nan Xiang Fu from Zhejiang, Guang Xiang Fu from Guangdong) have slight variations in size and oil content but are all considered authentic.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Xiang Fu

Non-toxic

Xiang Fu is classified as non-toxic in the Chinese Pharmacopoeia. Animal toxicity studies have shown a very high safety margin: oral administration of ethanolic extract at 5,000 mg/kg in mice did not produce any toxicity signs, behavioral changes, mortality, or gross organ abnormalities. The intraperitoneal LD50 of the root extract is reported at approximately 90 g/kg. In feeding studies, up to 25% Xiang Fu in the diet was well tolerated by rats. No special toxicity concerns exist at standard clinical doses. However, very prolonged use at doses well above the standard range has been associated with possible mild liver enzyme elevation, likely related to accumulation of certain terpene compounds. This is not a concern at normal therapeutic dosages and durations.

Contraindications

Situations where Xiang Fu should not be used or requires extra caution

Caution

Qi deficiency without stagnation (气虚无滞). Xiang Fu is a Qi-moving herb and can further deplete Qi in people who are already deficient. It should only be used when there is genuine Qi stagnation present.

Caution

Yin deficiency with Blood Heat (阴虚血热). The herb's dispersing and Qi-moving nature can aggravate Heat symptoms and further consume Yin fluids in those with underlying Yin deficiency.

Avoid

Pregnancy. Xiang Fu has Qi-moving and mild Blood-activating properties that could theoretically stimulate uterine activity. It should be avoided during pregnancy unless specifically prescribed by a qualified practitioner.

Caution

Menorrhagia or heavy menstrual bleeding without Qi stagnation. While Xiang Fu is a key gynecological herb, its Qi-moving action may worsen excessive bleeding if the underlying cause is Qi deficiency failing to hold Blood, rather than stagnation.

Caution

Long-term unsupervised use at high doses. Prolonged use at excessive dosages (well above the standard range) may deplete Qi and could potentially cause liver enzyme elevation due to accumulation of certain terpene components.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Xiang Fu should be avoided during pregnancy. As a Qi-moving herb with mild Blood-activating properties, it could theoretically stimulate uterine contractions or disturb fetal stability, particularly in the first trimester. Classical sources note that Qi-moving herbs can be harmful during pregnancy by disrupting the Qi that secures the fetus. Some Chinese medical references list it among herbs that pregnant women should avoid. If a qualified practitioner determines that a pregnant patient has severe Liver Qi stagnation requiring treatment, Xiang Fu might be used with great caution at reduced dosage and for a limited time, but this decision should only be made by an experienced clinician after careful assessment.

Breastfeeding

There is limited specific data on the safety of Xiang Fu during breastfeeding. Classical Chinese medical texts do not specifically address this. Given its Qi-moving nature and aromatic volatile oil content, some caution is warranted as these compounds may theoretically pass into breast milk. However, the herb is not considered toxic and has been used traditionally in postpartum formulas to promote recovery and regulate menstruation after childbirth. Use during breastfeeding should be under the guidance of a qualified practitioner, at standard doses, and for limited durations.

Children

Xiang Fu can be used in children at appropriately reduced dosages, typically one-third to one-half of the adult dose depending on age and weight. Li Shizhen noted in the Ben Cao Gang Mu that for children, 'Qi grows daily and the form becomes solid,' suggesting Xiang Fu's Qi-regulating properties are appropriate across age groups. However, because children's digestive systems are delicate and their Qi is still developing, prolonged or unsupervised use should be avoided. It is most suitable for children over age 3 with clear signs of Qi stagnation (such as abdominal distension or food stagnation). Always consult a practitioner experienced in pediatric TCM.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Xiang Fu

No serious drug interactions have been definitively established for Xiang Fu through rigorous clinical studies. However, based on its known pharmacological properties, the following theoretical interactions should be considered:

  • Anticoagulant and antiplatelet medications (e.g. warfarin, aspirin): Xiang Fu has mild Blood-activating properties, and some sources suggest possible additive effects on bleeding risk when combined with anticoagulants. Patients on these medications should exercise caution and inform their healthcare provider.
  • Calcium channel blockers and antihypertensives: In vitro and animal studies have shown that C. rotundus extracts exhibit vasodilatory activity through calcium channel blockade. Concurrent use with calcium channel blockers or other antihypertensive drugs could theoretically enhance blood pressure lowering effects.
  • Antidiabetic medications: Some research suggests C. rotundus may have mild hypoglycemic effects. Diabetic patients on blood sugar lowering medications should monitor blood glucose levels if using Xiang Fu concurrently.

These interactions are based on pharmacological reasoning from preclinical data rather than documented clinical cases. Nonetheless, patients taking pharmaceutical medications should always inform their doctor before using Xiang Fu.

Dietary Advice

Foods and dietary considerations when taking Xiang Fu

When taking Xiang Fu to treat Liver Qi stagnation and digestive discomfort, avoid cold and raw foods that may further impair Spleen and Stomach function. Lightly cooked, warm foods are preferable. Avoid greasy, heavy, or overly rich foods that contribute to stagnation. When Xiang Fu is being used for menstrual regulation, avoid excessively sour or astringent foods that may counteract its dispersing and moving nature. Moderate consumption of mildly aromatic foods like tangerine peel, ginger, and mint can complement its Qi-moving action.

Botanical Description

Physical characteristics and morphology of the Xiang Fu source plant

Cyperus rotundus L. (purple nutsedge) is a perennial sedge in the family Cyperaceae, growing in small tufts typically 15 to 50 cm tall, occasionally reaching up to 75 cm. The stems are erect and distinctively triangular in cross-section, thickened at the base into a dark, bulb-like structure. Leaves are linear, deep green and glossy, arranged in ranks of three from the base, up to 30 cm long and about 5 to 7 mm wide, with rough (scabrous) margins.

The plant spreads aggressively through underground rhizomes that produce chains of small, irregularly shaped tubers (the medicinal part). These tubers are spindle-shaped, roughly 1 to 3 cm long, covered in dark fibrous scales, and emit a characteristic aromatic, slightly peppery scent when crushed. The flowers are small spikelets in reddish-purple to reddish-brown clusters at the stem tips, blooming from May to August, with fruits maturing from July to November.

C. rotundus is native to Africa, southern Europe, and southern Asia but has become one of the world's most widespread and invasive weeds, found across tropical and warm temperate regions worldwide. It thrives in full sun, tolerates a range of soil types, and grows in fields, roadsides, wastelands, and wetland margins.

Sourcing & Harvesting

Where Xiang Fu is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Autumn (September to October), when the underground tubers have accumulated the highest concentration of essential oils and active compounds.

Primary growing regions

Xiang Fu is mainly produced in Shandong, Zhejiang, Fujian, Hunan, and Henan provinces of China. It is also cultivated in Guangxi and other southern regions. The highest quality is traditionally attributed to Shandong (called 'Dong Xiang Fu' / 东香附) and Zhejiang (called 'Nan Xiang Fu' / 南香附), which are considered the principal dao di (terroir) sources. Guangdong also produces a recognized variety called 'Guang Xiang Fu' (广香附). The plant grows wild in warm temperate to tropical zones across the globe, from southern Europe and Africa through to Southeast Asia and the Americas.

Quality indicators

Good quality Xiang Fu rhizomes are large (2 to 3.5 cm long), spindle-shaped, with a firm, hard texture. The surface should be dark brown to blackish-brown with visible longitudinal wrinkles and 6 to 10 slightly raised ring-like nodes. When processed by steaming or boiling, the cross-section should appear yellowish-brown to reddish-brown with a glossy, horn-like (角质) appearance. Sun-dried specimens show a whitish, starchy cross-section with a distinct inner cortex ring and a slightly darker central column with scattered vascular bundles. The key quality indicator is a strong, characteristic aromatic fragrance. The taste should be distinctly, though mildly, bitter. The 2020 Chinese Pharmacopoeia uses volatile oil content as the quality control standard. Avoid pieces that are soft, moldy, or lacking fragrance.

Classical Texts

Key passages from the classical Chinese medical texts that describe Xiang Fu and its therapeutic uses

《本草纲目》 (Ben Cao Gang Mu) — Li Shizhen

Original: 香附之气平而不寒，香而能窜，其味多辛能散，微苦能降，微甘能和。生则上行胸膈，外达皮肤，熟则下走肝肾，外彻腰足。……乃气病之总司，女科之主帅也。

Translation: "The nature of Xiang Fu is balanced and not cold. Its fragrance allows it to penetrate. Its predominantly acrid flavor enables dispersal, its slight bitterness enables descent, and its slight sweetness enables harmonization. Used raw, it ascends to the chest and reaches the skin; processed, it descends to the Liver and Kidneys and reaches the lower back and feet. … It is the General Commander over all Qi diseases, and the Chief Marshal of gynecology."

《名医别录》 (Ming Yi Bie Lu)

Original: 主除胸中热，充皮毛，久服利人，益气，长须眉。

Translation: "It mainly clears Heat from the chest, enriches the skin and hair. Taken over a long period, it benefits the person, supplements Qi, and promotes the growth of whiskers and eyebrows."

《滇南本草》 (Dian Nan Ben Cao) — Lan Mao

Original: 调血中之气，开郁，宽中，消食，止呕吐。

Translation: "It regulates the Qi within the Blood, opens constraint, relaxes the middle, aids digestion, and stops nausea and vomiting."

《本草衍义补遗》 (Ben Cao Yan Yi Bu Yi) — Zhu Danxi

Original: 香附子，必用童便浸，凡血气药必用之，引至气分而生血，此阳生阴长之义也。

Translation: "Xiang Fu should be soaked in child's urine [a traditional processing method]. It is essential in any formula for Blood and Qi conditions. It guides [the formula] into the Qi aspect to generate Blood — this is the meaning of Yang generating Yin."

Historical Context

The history and evolution of Xiang Fu's use in Chinese medicine over the centuries

Xiang Fu was first recorded as "Sha Cao" (莎草) in the Ming Yi Bie Lu (Supplementary Records of Famous Physicians) during the Wei-Jin period, listed as a middle-grade herb. The Tang Ben Cao (Tang Dynasty Materia Medica, 659 CE) was the first text to use the name "Xiang Fu Zi" (香附子). Li Shizhen's Ben Cao Gang Mu (1578 CE) placed it in the fragrant herbs section and gave it the monumental title "General Commander of all Qi diseases, Chief Marshal of gynecology" (气病之总司，女科之主帅), a title that has defined the herb's clinical identity ever since.

The Jin-Yuan period physician Zhu Danxi (朱丹溪, 1281–1358) was instrumental in establishing Xiang Fu's central role in treating constraint (Yu Zheng / 郁证). His famous formula Yue Ju Wan (越鞠丸), which addresses the six types of constraint (Qi, Blood, Phlegm, Fire, Food, and Dampness), uses Xiang Fu as its chief herb. Another famous pairing is with Gao Liang Jiang (galangal) in Liang Fu Wan (良附丸), a simple yet effective formula for cold-stagnation stomach pain. Li Shizhen further elaborated that different processing methods direct the herb's action to specific areas: raw for ascending to the chest and exterior, vinegar-processed for resolving accumulation, wine-processed for coursing through the channels, and charred for stopping bleeding. This detailed processing theory, described vividly in the Ben Cao Gang Mu, remains a cornerstone of Xiang Fu's clinical use.

The name "Xiang Fu" literally means "fragrant appendage," referring to its aromatic tuber (the appendage or root extension). Interestingly, outside of Chinese medicine, the tuber of Cyperus rotundus has a long history of use in ancient Egypt, Mycenaean Greece, India (Ayurveda, where it is known as "Musta" or "Nagarmotha"), and Sudan, where archaeological evidence shows it was consumed by humans as far back as the Mesolithic period.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Xiang Fu

1

Comprehensive review of phytochemistry, pharmacology, toxicology and analytical methods of Cyperus rotundus L. (2023)

Xue BX, He RS, Lai JX, Mireku-Gyimah NA, Zhang LH, Wu HH. Phytochemistry Reviews, 2023, Online ahead of print.

This extensive review systematically collated 552 compounds identified from C. rotundus, including sesquiterpenoids, flavonoids, and alkaloids. It summarized pharmacological effects on the digestive system, nervous system, and gynecological conditions, as well as anti-inflammatory, antioxidant, and anticancer activities. Toxicological studies confirmed the general safety of the herb.

DOI
2

Traditional uses, phytochemistry, and pharmacological activities of Cyperus rotundus L. (Review, 2015)

Pirzada AM, Ali HH, Naeem M, Latif M, Bukhari AH, Tanveer A. Journal of Ethnopharmacology, 2015, 174: 540-560.

A comprehensive review covering literature from 2000 to 2015 that documented C. rotundus as possessing antiandrogenic, antibacterial, anticancer, anticonvulsant, antidiabetic, anti-inflammatory, antimalarial, antioxidant, hepatoprotective, cardioprotective, and neuroprotective properties. Acute toxicity testing at 5,000 mg/kg showed no signs of toxicity in mice.

DOI
3

Pharmacological validation of folkloric uses of Cyperus rotundus in gastrointestinal, bronchial and vascular disorders (In vivo and in vitro, 2018)

Published in Journal of Ethnopharmacology, 2018.

This study demonstrated that crude extract of C. rotundus exhibited dose-dependent spasmolytic effects on rabbit jejunum, bronchodilator activity on trachea preparations, and vasodilator effects on aorta preparations, all through calcium channel blockade. These findings validate the traditional use of Xiang Fu for digestive discomfort and pain relief.

PubMed
4

Cyperus spp.: A Review on Phytochemical Composition, Biological Activity, and Health-Promoting Effects (Review, 2021)

Published in Evidence-Based Complementary and Alternative Medicine, 2021.

This review across Cyperus species confirmed C. rotundus as the most pharmacologically studied species in the genus, with demonstrated antioxidant, anti-inflammatory, antimicrobial, anticancer, neuroprotective, and antidepressant activities. The LD50 of the essential oil was found to be 5,000 mg/kg in rats, confirming low toxicity.

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.