Herb Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

Zhi Ju Zi

Oriental Raisin Tree Fruit · 枳椇子

Hovenia dulcis Thunb. · Semen Hoveniae

Also known as: Guai Zao (拐枣), Ji Zhua Li (鸡爪梨)

Zhi Ju Zi (Oriental Raisin Tree Fruit) plant

Images shown are for educational purposes only

Zhǐ Jǔ Zǐ is best known as the premier alcohol-detoxifying herb in Chinese medicine, with a folk saying that it can keep a person sober through "a thousand cups." It is a mild, neutral seed that helps relieve hangover symptoms like nausea, thirst, and headache, while also supporting healthy urination and reducing fluid retention. It is gentle enough to be used as a food supplement and is included in China's list of medicinal-food dual-use ingredients.

Category Dampness-draining herbs (利水渗湿药) Water-draining and edema-reducing herbs (利水消肿药)
Therapeutic focus Liver Health Hangover Relief Urinary Health Digestive Health

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān)

Channels entered

Stomach

Parts used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

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 Zhi Ju Zi does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Zhi Ju Zi is primarily used to support these areas of health:

Liver Health Hangover Relief Urinary Health Digestive Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Zhi Ju Zi performs to restore balance in the body:

Relieves Alcohol Toxicity Eliminates Irritability and Relieves Thirst Promotes Urination and Reduces Edema Stops Vomiting Promotes Bowel and Urinary Movement

How these actions work

'Resolves alcohol toxicity' is the most celebrated action of Zhǐ Jǔ Zǐ. It means this herb helps the body clear and neutralize the harmful effects of alcohol. It has been praised in classical texts for centuries as being superior to Gé Huā (Kudzu flower) for this purpose. It is used for hangover symptoms such as headache, nausea, vomiting, and thirst after drinking.

'Promotes urination and reduces edema' means the herb helps open the water passages and drain excess fluid accumulation. When dampness or water collects in the body causing swelling and difficult urination, Zhǐ Jǔ Zǐ gently promotes fluid movement. It can be combined with herbs like Fú Líng and Zé Xiè to strengthen this effect.

'Relieves thirst and eliminates irritability' refers to the herb's ability to generate fluids and calm restlessness. This applies in cases of feverish illness where body fluids have been consumed, or in heat conditions following alcohol excess, where the person feels intensely thirsty and agitated. Its sweet, neutral nature gently nourishes without being overly cold or warm.

'Stops vomiting' describes the herb's capacity to harmonize the Stomach and settle rebellious Qi that rises upward. This is especially relevant for nausea and vomiting caused by alcohol intoxication or Damp-Heat disturbing the Stomach.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Zhi Ju Zi is used to help correct these specific patterns.

Why Zhi Ju Zi addresses this pattern

When excessive alcohol consumption generates Damp-Heat in the middle burner (Stomach and Spleen), it disrupts the Stomach's descending function and impairs the Spleen's ability to transform and transport fluids. Zhǐ Jǔ Zǐ's sweet, neutral nature enters the Stomach channel directly, where it resolves alcohol toxicity and clears the accumulated Damp-Heat. Its ability to promote urination helps drain the dampness downward through the water passages, while its anti-vomiting action restores the Stomach's normal descending movement. This makes it particularly suited for the aftermath of alcohol overindulgence where Damp-Heat lodges in the middle burner.

A practitioner would look for one or more of these signs

Nausea Or Vomiting

Especially after alcohol consumption

Excessive Thirst

Intense thirst with desire for cold drinks

Scanty And Yellow Urine

Reduced, dark urination after drinking

Abdominal Pain

Epigastric fullness and discomfort

Commonly Used For

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

Arises from: Damp-Heat in Stomach and Spleen

TCM Interpretation

In TCM, alcohol is understood as a substance that is Hot and Damp in nature. When consumed in excess, it generates intense internal Heat while simultaneously producing pathological Dampness. This Damp-Heat lodges primarily in the Stomach and Spleen, disrupting the Stomach's descending function (causing nausea and vomiting) and the Spleen's transforming function (causing fluid accumulation and sluggishness). The Heat consumes body fluids, leading to intense thirst and irritability. The toxic byproducts of alcohol further burden the Liver, which is responsible for the smooth flow of Qi throughout the body.

Why Zhi Ju Zi Helps

Zhǐ Jǔ Zǐ directly addresses the core pathology of hangover by resolving alcohol toxicity in the Stomach. Its sweet, neutral nature is gentle enough to use when the Stomach is already irritated and cannot tolerate harsh or dispersing herbs. By entering the Stomach channel, it works right where the damage occurs. It restores the Stomach's descending function (stopping vomiting), generates fluids to relieve thirst, and promotes urination to help the body eliminate the dampness and toxic residues of alcohol. Modern research has confirmed that compounds in Zhǐ Jǔ Zǐ, particularly dihydromyricetin, enhance the activity of alcohol dehydrogenase (ADH) in the liver, accelerating the breakdown of alcohol in the blood.

Also commonly used for

Nausea Or Vomiting

Especially alcohol-related nausea

Excessive Thirst

Thirst from heat illness or alcohol excess

Edema

Mild edema with difficult urination

Fatty Liver

Especially alcohol-related fatty liver

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

Sweet (甘 gān)

Channels Entered

Stomach

Parts Used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

Dosage & Preparation

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

Standard dosage

6-15g

Maximum dosage

Up to 30g in decoction for acute alcohol intoxication, under practitioner guidance. Some folk prescriptions use fresh material at 30g.

Dosage notes

Standard decoction dose is 6-15g. For resolving alcohol intoxication, higher doses around 12-30g may be used, often crushed before decocting to release the active compounds from the hard seed coat. Some clinical references cite a range of 4.5-9g for milder applications. The herb can also be prepared as pills with the seeds ground into powder, or soaked in wine for Wind-Damp conditions affecting the limbs. When combined with Ge Hua (Kudzu Flower) for hangover, 12g of Zhi Ju Zi with 9g of Ge Hua is a common pairing.

Preparation

The seeds should be crushed (捣碎) before decocting to allow adequate extraction of active compounds through the hard seed coat. No other special decoction handling is required.

Common Herb Pairs

These ingredients are traditionally combined with Zhi Ju Zi for enhanced therapeutic effect

Ge Hua
Ge Hua Zhǐ Jǔ Zǐ 12g : Gé Huā 9g

This is the most classical alcohol-detoxifying pair in Chinese medicine. Zhǐ Jǔ Zǐ resolves alcohol toxicity through the Stomach channel and promotes urination to drain Damp-Heat downward, while Gé Huā (Kudzu flower) awakens the Spleen and resolves dampness through aromatic transformation. Together they address alcohol toxicity from two angles: Zhǐ Jǔ Zǐ clears the toxic residue while Gé Huā revives the Spleen's digestive function.

When to use: For acute hangover with nausea, vomiting, thirst, headache, and epigastric discomfort after alcohol overindulgence.

Ge Gen
Ge Gen 1:1 (e.g. Zhǐ Jǔ Zǐ 15g : Gé Gēn 15g)

Zhǐ Jǔ Zǐ resolves alcohol toxicity and promotes urination, while Gé Gēn (Kudzu root) generates fluids, relieves thirst, and raises clear Yang. The combination provides comprehensive support for the body's recovery from alcohol, addressing both the toxic accumulation and the depletion of fluids that heavy drinking causes.

When to use: For hangover with pronounced thirst, headache, dizziness, and general fatigue. Also used preventively before drinking occasions.

Fu Ling
Fu Ling Zhǐ Jǔ Zǐ 12g : Fú Líng 15g

Zhǐ Jǔ Zǐ gently promotes urination and resolves toxicity, while Fú Líng (Poria) strengthens the Spleen and powerfully drains dampness. Together they effectively address water retention and edema by both supporting the Spleen's fluid-transforming function and opening the urinary pathway.

When to use: For edema and difficult urination due to impaired water metabolism, particularly when dampness stems from weakened Spleen function or chronic alcohol use.

Comparable Ingredients

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

Ge Hua
Zhi Ju Zi vs Ge Hua

Both Zhǐ Jǔ Zǐ and Gé Huā are premier alcohol-detoxifying herbs. However, Gé Huā is aromatic and works primarily by awakening the Spleen and resolving dampness through aromatic transformation, making it better for cases where the Spleen is sluggish and digestion is poor. Zhǐ Jǔ Zǐ enters the Stomach channel more directly, resolves alcohol toxicity, and additionally promotes urination, making it more suitable when there is also fluid retention or difficult urination. Classical texts note that Zhǐ Jǔ Zǐ's alcohol-resolving power surpasses that of Gé Huā.

Ge Gen
Zhi Ju Zi vs Ge Gen

Gé Gēn (Kudzu root) is a much broader-acting herb that releases the exterior, generates fluids, raises Yang, and stops diarrhea. Its alcohol-resolving effect is secondary to these other actions. Zhǐ Jǔ Zǐ, by contrast, is a specialist: its primary indication is alcohol toxicity. Gé Gēn is better when hangover is accompanied by muscle tension, diarrhea, or exterior symptoms. Zhǐ Jǔ Zǐ is preferred when the main concerns are nausea, thirst, and water retention from drinking.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Zhi Ju Zi

The three official source species (Hovenia dulcis, H. acerba, and H. trichocarpa) are all accepted as Zhi Ju Zi, though they differ slightly in seed appearance. H. dulcis seeds are typically reddish-brown with a flat round shape; H. acerba seeds are darker (brownish-black to dark purple); H. trichocarpa seeds are larger (4-5.5 mm), black or dark purple, sometimes with nipple-like protrusions on the back. In some regions (Guangdong, Guangxi), the entire fleshy fruit peduncle is sold together with or instead of the seeds. Buyers should verify they are getting the correct medicinal part (seeds versus fruit stalks), as the two have overlapping but different clinical profiles. The sweet fleshy peduncles are more commonly used as food, while the seeds are the primary medicinal form.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Zhi Ju Zi

Non-toxic

Zhi Ju Zi is classified as non-toxic in classical sources, including the Xin Xiu Ben Cao. It is also officially listed as a "medicine-food dual use" (药食同源) substance by China's health authorities. No significant toxic components or adverse effects have been documented at standard therapeutic doses. The key bioactive compound dihydromyricetin (DHM) has been assessed by the NIH LiverTox database with no reported instances of liver injury, and mammalian cell studies show no cytotoxic effects from the herb's extracts.

Contraindications

Situations where Zhi Ju Zi should not be used or requires extra caution

Caution

Spleen and Stomach deficiency-cold (脾胃虚寒): Zhi Ju Zi has a cooling, fluid-promoting action that can worsen cold-type digestive weakness with loose stools, poor appetite, or abdominal cold pain. Classical source: De Pei Ben Cao (《得配本草》) states this herb is prohibited for those with Spleen-Stomach deficiency-cold.

Caution

Diarrhea due to Spleen deficiency: Because this herb promotes urination and moves fluids downward, it may aggravate existing diarrhea in people with weak digestive function.

Caution

Excessive or prolonged use without indication: As a fluid-moving herb, taking it unnecessarily over long periods may deplete body fluids in people who do not have Dampness or alcohol toxin accumulation.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific pregnancy contraindication is documented in classical or modern sources. However, because Zhi Ju Zi promotes urination and moves fluids, and because safety data in pregnant women is absent, it is best avoided during pregnancy or used only under practitioner guidance. There are no known teratogenic or uterine-stimulating properties.

Breastfeeding

No specific breastfeeding contraindication is documented. Zhi Ju Zi is classified as a medicine-food dual use substance and is considered mild and non-toxic. However, as formal safety data for nursing mothers is lacking, it should be used at standard doses and preferably under practitioner guidance during breastfeeding.

Children

Classical sources (Dian Nan Ben Cao) mention use in children for dispelling parasites and nourishing the Spleen. The herb is mild and classified as non-toxic, and its medicine-food dual status suggests reasonable safety. However, paediatric doses should be reduced proportionally based on age and body weight (typically one-third to one-half of the adult dose for children over 6). Use in very young children should be under practitioner guidance.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Zhi Ju Zi

No well-documented pharmaceutical drug interactions are established in clinical literature for whole Zhi Ju Zi seeds. However, given the herb's pharmacological profile, the following theoretical considerations apply:

  • Alcohol metabolism drugs (disulfiram/Antabuse): Because Zhi Ju Zi and its key compound dihydromyricetin (DHM) enhance alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) activity to speed alcohol metabolism, concurrent use with disulfiram (which deliberately blocks ALDH to create alcohol aversion) could result in opposing pharmacological effects. Avoid combining.
  • Sedatives and GABA-active drugs (benzodiazepines, barbiturates): Preclinical research shows DHM modulates GABA-A receptors and can counteract alcohol-induced sedation. This raises a theoretical concern for interaction with other GABA-targeting medications, potentially reducing their sedative efficacy.
  • Hypoglycaemic agents: Some research suggests DHM may improve glucose metabolism. People taking insulin or oral hypoglycaemic drugs should monitor blood sugar, as additive effects are theoretically possible.

Dietary Advice

Foods and dietary considerations when taking Zhi Ju Zi

When taking Zhi Ju Zi for alcohol detoxification, it is advisable to avoid further alcohol consumption and greasy, fried foods that burden the liver. Cold, raw foods should be limited if the person has underlying Spleen weakness. The herb itself is classified as a medicine-food dual use substance and can be incorporated into soups and teas.

Botanical Description

Physical characteristics and morphology of the Zhi Ju Zi source plant

Hovenia dulcis Thunb. (and related species H. acerba and H. trichocarpa) is a deciduous tree in the Rhamnaceae (buckthorn) family, commonly known as the Oriental Raisin Tree or Japanese Raisin Tree. It typically grows 10 to 30 metres tall with grey-black bark and brown to dark purple branchlets. The leaves are large, glossy, heart-shaped to oval, with serrated edges and prominent veins. In summer (around July), it produces clusters of small cream to pale yellow hermaphroditic flowers.

The most distinctive feature is its fruit structure: small round drupes (containing the medicinal seeds) sit at the tips of swollen, fleshy, twisted fruit stalks (peduncles) that become sweet and edible when ripe, tasting somewhat like raisins or dried dates, hence the common name. The seeds themselves are flattened and round, 3 to 5 mm in diameter, with a hard, glossy seed coat ranging from reddish-brown to blackish-purple. The tree thrives in sunny positions on moist, well-drained soils at elevations up to 2,100 metres and is found both wild and cultivated across East Asia.

Sourcing & Harvesting

Where Zhi Ju Zi is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Autumn (October to November), when the fruits are fully ripe. The fruit is picked together with the fleshy peduncle (flower stalk), sun-dried, then the seeds are separated from the fruit shells.

Primary growing regions

Mainly produced in Shaanxi, Guangdong, and Hubei provinces. Also found across Zhejiang, Jiangsu, Anhui, Fujian, Jiangxi, Hunan, Sichuan, Yunnan, Guizhou, and Hebei. Shaanxi Province (particularly Xunyang County in Ankang) is the most significant modern production area, with Xunyang Hovenia fruit recognized as a National Geographic Indication Product. The Han River Plain region (including Wuhan, Hubei) has been shown to produce seeds with particularly high dihydromyricetin content. The tree grows wild across a wide range from Hebei in the north to Guangdong in the south, at elevations up to 2,100 metres.

Quality indicators

Good quality Zhi Ju Zi seeds are plump, solid, and full with a glossy surface. The colour should be reddish-brown to dark brown (brownish-black for some species). Under a magnifying glass, scattered small pits should be visible on the surface, with a pale seed scar at the base and a raised seed ridge along the ventral surface. The seed coat should be hard, with white endosperm and pale yellow, oily cotyledons when cut open. The odour is faint and the taste slightly astringent. Avoid seeds that are shrivelled, broken, or dull in colour.

Classical Texts

Key passages from the classical Chinese medical texts that describe Zhi Ju Zi and its therapeutic uses

Shi Liao Ben Cao (《食疗本草》, Tang Dynasty)

Chinese: 昔有南人修舍此木，误落一片入酒瓮中，酒化为水也。

English: "In the past, a southerner was repairing a house using this wood, and a piece accidentally fell into a wine jar. The wine turned into water." (This vivid anecdote illustrates the powerful alcohol-neutralizing reputation of Hovenia.)

Ben Cao Shi Yi (《本草拾遗》, Tang Dynasty, Chen Cangqi)

Chinese: 止渴除烦，润五脏，利大小便，去膈上热，功用如蜜。

English: "It stops thirst and eliminates vexation, moistens the five organs, promotes urination and bowel movement, removes Heat from the diaphragm, and its function is like honey."

Dian Nan Ben Cao (《滇南本草》, Ming Dynasty)

Chinese: 治一切左瘫右痪，风湿麻木，能解酒毒；或泡酒服之，亦能舒筋络。小儿服之，化虫，养脾。

English: "Treats all forms of hemiplegia and paralysis, Wind-Damp numbness, and can resolve alcohol toxin. Soaked in wine and taken, it also relaxes the sinews and channels. When children take it, it dispels parasites and nourishes the Spleen."

Ben Cao Gang Mu (《本草纲目》, Ming Dynasty, Li Shizhen)

Chinese: 止呕逆。

English: "Stops vomiting and counterflow."

Yi Fang Kao (《医方考》, Ming Dynasty)

Chinese: 枳椇子解酒，过于葛花。今后凡遇伤酒中酒者，宜用之。

English: "Zhi Ju Zi resolves alcohol intoxication more effectively than Ge Hua (Kudzu Flower). Henceforth, whenever encountering alcohol injury or intoxication, it should be used."

Historical Context

The history and evolution of Zhi Ju Zi's use in Chinese medicine over the centuries

Zhi Ju Zi has a documented history spanning over 3,000 years in China. It first appears in the Shi Jing (Book of Songs, c. 1000 BCE), where the tree is referenced by its ancient name "gou" (枸). Its first formal pharmaceutical documentation was in the Xin Xiu Ben Cao (Tang Materia Medica, 659 CE), China's first government-compiled pharmacopoeia. The Tang-era Shi Liao Ben Cao preserved the famous folk story of a wood chip falling into a wine jar and turning the wine to water, cementing its reputation as the premier anti-alcohol herb.

During the Yuan Dynasty, the Ben Cao Yan Yi Bu Yi recorded a notable case where Ge Gen (Kudzu Root) failed to relieve alcohol-related heat in a debilitated patient because its dispersing nature was too harsh, but Zhi Ju Zi succeeded. The Yuan-era Shi Yi De Xiao Fang formalized the "Zhi Ju Zi Wan" (Hovenia Seed Pill) for chronic alcohol damage. By the Ming Dynasty, the Yi Fang Kao declared Zhi Ju Zi superior to Ge Hua (Kudzu Flower) for resolving alcohol intoxication. The folk saying "a thousand cups cannot intoxicate with Zhi Ju Zi" (千杯不醉枳椇子) reflects its deep cultural association with alcohol detoxification. The herb has accumulated many colourful folk names over the centuries, including "Chicken Claw Pear" (鸡爪梨), "Longevity Fruit" (万寿果), and "Wood Honey" (木蜜), the last reflecting the sweet taste of its fleshy fruit stalks.

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Zhi Ju Zi

1

Randomized Controlled Crossover Trial: Hovenia dulcis fruit extract for alcohol-induced hangover in subjects with heterozygous ALDH2 (2017)

Kim H, Kim YJ, Jeong HY, Kim JY, Choi EK, Chae SW, Kwon O. Journal of Ethnopharmacology, 2017, 209: 167-174.

This trial enrolled 26 healthy men with the ALDH2 gene variant (common in East Asians, causing poor alcohol metabolism). Participants consumed 50g of alcohol with either a standardized Hovenia dulcis fruit extract (2,460 mg) or placebo. The extract group showed significantly faster declines in blood alcohol, acetaldehyde levels, and hangover symptom scores compared to placebo, supporting the traditional use for resolving alcohol intoxication.

2

Preclinical Study: Dihydromyricetin as a novel anti-alcohol intoxication medication (2012)

Shen Y, Lindemeyer AK, Gonzalez C, Shao XM, Spigelman I, Bhatt D, Bhatt SL, Olsen RW, Liang J. Journal of Neuroscience, 2012, 32(1): 390-401.

This landmark study from UCLA identified dihydromyricetin (DHM), a flavonoid from Hovenia dulcis, as a potent counteragent to acute alcohol intoxication in rats. At just 1 mg/kg, DHM reversed loss of righting reflex (a measure of sedation), reduced anxiety during alcohol withdrawal, and prevented escalation of voluntary alcohol consumption. The mechanism involves modulation of GABA-A receptors, which are a primary target of alcohol in the brain.

PubMed
3

Randomized Controlled Trial: Dihydromyricetin for glucose/lipid metabolism in non-alcoholic fatty liver disease (2015)

Chen S, Zhao X, Wan J, Ran L, Qin Y, Wang X, Gao Y, Shu F, Zhang Y, Liu P, Zhang Q, Zhu J, Mi M. Pharmacological Research, 2015, 99: 74-81.

This RCT investigated dihydromyricetin (the main bioactive flavonoid in Zhi Ju Zi) in patients with non-alcoholic fatty liver disease. The treatment group showed improved glucose and lipid metabolism along with reduced inflammatory markers compared to controls, suggesting hepatoprotective and metabolic benefits beyond alcohol-related conditions.

PubMed
4

Review: Hovenia dulcis Thunberg - Phytochemistry, Pharmacology, Toxicology and Regulatory Framework (2021)

Sferrazza G, Brusotti G, Zonfrillo M, Temporini C, Tengattini S, Bononi M, Tateo F, Calleri E, Pierimarchi P. Molecules, 2021, 26(4): 903.

A comprehensive review documenting the pharmacological properties of Hovenia dulcis, including antidiabetic, anticancer, antioxidant, anti-inflammatory, and hepatoprotective activities. The review catalogues the main chemical constituents (flavonoids, triterpenoid saponins, alkaloids) and notes that extracts increase alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) activity, accelerating alcohol clearance from the blood.

5

Review: Hovenia dulcis in alcohol-associated liver disease (2024)

He YX, Liu MN, Wang YY, Wu H, Wei M, Xue JY, Zou Y, Zhou X, Chen H, Li Z. Frontiers in Pharmacology, 2024, 15: 1337633.

This review synthesized evidence on Hovenia dulcis chemical constituents (dihydromyricetin, quercetin, beta-sitosterol) and their effects on alcohol-associated liver disease through multiple pathways including ethanol metabolism enhancement, immune response modulation, anti-fibrosis, antioxidant activity, improved lipid metabolism, and strengthened intestinal barrier function. The authors note that most evidence comes from preclinical studies and call for rigorous clinical trials.

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.