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

Li Zhi He

Lychee seed · 荔枝核

Litchi chinensis Sonn. · Semen Litchi

Also known as: Lì Rén (荔仁), Zhī Hé (枝核), Dà Lì Hé (大荔核),

Li Zhi He (Lychee seed) plant

Images shown are for educational purposes only

Lychee seed is the dried pit of the lychee fruit, used in Chinese medicine primarily for pain in the lower abdomen, groin, and testicles caused by Cold and stagnation. It gently warms the body, moves stuck Qi, and breaks up nodules, making it especially useful for hernias, testicular discomfort, stomach pain, and menstrual cramps related to Cold conditions.

Category Qi-regulating herbs (理气药)
Therapeutic focus Hernia Support Stomach Pain Relief Menstrual Pain Relief Lower Abdominal Pain Relief

TCM Properties

Temperature

Warm

Taste

Sweet (甘 gān), Bitter (苦 kǔ), Astringent (涩 sè)

Channels entered

Liver, Kidneys

Parts used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

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What This Herb Does

Every herb has a specific set of actions — here's what Li Zhi He does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Li Zhi He is primarily used to support these areas of health:

Hernia Support Stomach Pain Relief Menstrual Pain Relief Lower Abdominal Pain Relief

TCM Actions

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

Moves Qi and Dissipates Nodules Dispels Cold and Alleviates Pain Soothes the Liver and Regulates Qi Warms the Middle Burner and Stops Pain

How these actions work

'Regulates Qi and dissipates nodules' means this herb breaks up stagnation where Qi has become stuck and formed masses or swellings along the Liver channel. This is why it is a go-to herb for conditions like hernias and testicular swelling, where Cold has caused Qi to congeal in the lower abdomen and groin. In classical thinking, the seed's shape even resembles a testicle, reflecting the traditional principle of 'treating like with like' (取象比类).

'Dispels Cold and stops pain' refers to the herb's warm nature, which drives out Cold that has lodged in the Liver channel and lower body. When Cold blocks the flow of Qi and Blood, it causes cramping, sharp pain in the lower abdomen, or aching in the testicles. Li Zhi He's warmth unblocks these pathways and relieves the pain. This is the action behind its use in menstrual cramps and postpartum abdominal pain caused by Cold stagnation.

'Soothes the Liver and regulates Qi' means it gently moves stuck Liver Qi, which can manifest as flank pain, stomach discomfort, or emotional tension that leads to digestive problems. When the Liver fails to ensure smooth Qi flow and this affects the Stomach, Li Zhi He can help restore harmony between these two organs, easing bloating and epigastric pain.

Patterns Addressed

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

Why Li Zhi He addresses this pattern

Cold Stagnation in the Liver channel occurs when pathogenic Cold invades and blocks the Liver's pathway, which runs through the groin and wraps around the genitalia. This causes contraction, knotting, and severe pain in the lower abdomen and testicles. Li Zhi He is warm in nature and enters the Liver channel, giving it direct access to this territory. Its Qi-moving and Cold-dispersing actions unblock the congealed Qi, relieve the contraction, and dissolve the nodular swelling that characterises this pattern.

A practitioner would look for one or more of these signs

Hernia

Hernia pain in the groin worsened by cold

Orchitis

Testicular swelling and pain

Abdominal Pain

Cold pain in the lower abdomen radiating to the scrotum

Commonly Used For

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

Arises from: Cold Stagnation in the Liver Channel

TCM Interpretation

In TCM, hernias (疝气 shàn qì) are understood primarily as disorders of the Liver channel. The Liver's channel pathway runs through the inguinal region and wraps around the external genitalia. When Cold invades this channel, Qi congeals and fails to flow smoothly, causing the tissue to contract, swell, and bulge. The resulting pain is typically worse with cold exposure and improves with warmth. The condition reflects a combination of Cold pathogen invasion and underlying Qi stagnation in the Liver channel's lower territory.

Why Li Zhi He Helps

Li Zhi He directly enters the Liver channel and has a warm nature that counters the Cold responsible for the blockage. Its core actions of regulating Qi, dissipating nodules, and dispelling Cold precisely target the pathomechanism of hernia pain. By warming the channel and moving stuck Qi, it relaxes the contraction and reduces the swelling and pain. It is typically combined with other warm, Qi-moving herbs like Xiao Hui Xiang (fennel seed) and Ju He (tangerine seed) to strengthen this effect.

Also commonly used for

Orchitis

Testicular swelling and pain

Postpartum Abdominal Pain

Lower abdominal pain after childbirth

Hydrocele

Scrotal fluid accumulation (鞘膜积液)

Intercostal Neuralgia

Rib-area nerve pain

Epididymitis

Chronic epididymitis with Cold signs

Herb Properties

Every herb has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Warm

Taste

Sweet (甘 gān), Bitter (苦 kǔ), Astringent (涩 sè)

Channels Entered

Liver Kidneys

Parts Used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

Dosage & Preparation

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

Standard dosage

5–10g

Maximum dosage

Up to 15g in severe cold-stagnation pain, under practitioner supervision. Classical formulas sometimes use the seed individually (one whole seed, charred) for acute conditions.

Dosage notes

The standard dosage of 5–10g is used in decoction for hernia pain and cold abdominal pain. For enhanced effect on the Liver and Kidney channels (such as testicular pain and inguinal hernia), salt-processed Li Zhi He (yan li zhi he) is preferred. The seeds must be crushed or broken before decoction to release the active components. In classical practice, the seed was sometimes charred (burned to retain its properties, 'shao cun xing') and ground to fine powder, then taken with warm wine for acute pain, typically one seed per dose.

Preparation

The seeds must be crushed or broken into pieces (da sui, 打碎) before adding to a decoction, as the whole seed is too hard to extract effectively. For salt-processing (yan zhi, 盐炙), the crushed seeds are stir-fried with salt water until dry. No other special decoction handling is required.

Processing Methods

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

Processing method

The raw lychee seeds are crushed, then stir-fried with salt water until dry (盐水炙法).

How it changes properties

Salt processing guides the herb's action downward toward the Kidneys and lower body (lower Jiao), enhancing its ability to target the Liver and Kidney channels. This strengthens its pain-relieving effects on the lower abdomen, testicles, and groin area. The thermal nature remains warm, but the directional focus is sharpened downward.

When to use this form

The salt-processed form is preferred for hernia pain, testicular swelling, and lower abdominal Cold pain where the clinical focus is clearly in the lower body. It is the standard dispensary form when a prescription simply calls for Li Zhi He.

Common Herb Pairs

These ingredients are traditionally combined with Li Zhi He for enhanced therapeutic effect

Ju He
Ju He 1:1 (Li Zhi He 9g : Ju He 9g)

Both herbs enter the Liver channel and target the lower abdomen and groin. Ju He (tangerine seed) sinks downward and specialises in moving Qi and dissipating nodules, while Li Zhi He adds warmth to dispel Cold. Together they powerfully move Qi, scatter Cold, and reduce swelling in the inguinal and scrotal region.

When to use: Hernia pain, testicular swelling, and scrotal pain caused by Cold-Dampness congealing in the Liver channel.

Xiang Fu
Xiang Fu 1:2 (Li Zhi He 15g : Xiang Fu 30g), based on the classical Juan Tong San

Xiang Fu (Cyperus) is renowned for soothing Liver Qi and regulating menstruation, while Li Zhi He adds warmth and Cold-dispersing power. Together they address both the Qi stagnation and the Cold component of gynaecological pain, making this an effective pair for Blood-level and Qi-level pain in women.

When to use: Menstrual cramps, premenstrual pain, and postpartum abdominal pain where Liver Qi stagnation and Cold are both present.

Mu Xiang
Mu Xiang Li Zhi He 3g : Mu Xiang 2.4g (from Li Xiang San)

Mu Xiang (Costus root) excels at moving Qi in the Middle Jiao (Spleen and Stomach), while Li Zhi He focuses on Liver Qi. Together they address Liver-Stomach disharmony from two angles, providing comprehensive Qi-moving and pain-relieving coverage for the entire abdomen.

When to use: Chronic recurring epigastric or stomach pain caused by Liver Qi stagnation affecting the Stomach, especially when triggered by emotional stress.

Xiao Hui Xiang
Xiao Hui Xiang 1:1 (Li Zhi He 9g : Xiao Hui Xiang 9g)

Both are warm herbs that dispel Cold and move Qi in the lower body. Xiao Hui Xiang (fennel seed) warms the Kidneys and scatters Cold, while Li Zhi He focuses on the Liver channel. Together they treat Liver and Kidney Cold simultaneously, powerfully relieving hernia pain and lower abdominal Cold cramping.

When to use: Cold-type hernia with testicular swelling and pain, lower abdominal cramping worsened by cold.

Comparable Ingredients

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

Xiao Hui Xiang
Li Zhi He vs Xiao Hui Xiang

Both herbs dispel Cold from the lower body and treat hernia pain and testicular swelling. However, Li Zhi He more powerfully dredges stagnant Qi and Cold from the Liver channel and also acts on Blood stagnation, while Xiao Hui Xiang is more focused on warming the Kidneys and Stomach and is milder in its Qi-moving action. For pure Cold-type hernia, Xiao Hui Xiang is often first choice; when there is significant Qi stagnation with nodular swelling, Li Zhi He is preferred.

Ju He
Li Zhi He vs Ju He

Both enter the Liver channel and treat hernia and testicular pain. Ju He (tangerine seed) is more focused on dissipating hard nodules and swelling, making it better for palpable masses in the scrotum or breast. Li Zhi He has a stronger warming and Cold-dispersing action, making it more suitable when Cold is the dominant pathogenic factor. In practice, they are often used together.

Chuan Lian Zi
Li Zhi He vs Chuan Lian Zi

Both regulate Liver Qi and relieve pain in the flanks, abdomen, and groin. The critical difference is thermal nature: Chuan Lian Zi (Melia fruit) is cold and clears Liver Heat, so it suits Liver Qi stagnation with Heat signs (irritability, bitter taste, red tongue). Li Zhi He is warm and dispels Cold, so it suits Liver Qi stagnation with Cold signs (pain relieved by warmth, pale tongue, cold extremities). Choosing the wrong one can worsen the condition.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Li Zhi He

Li Zhi He is relatively distinctive and not commonly adulterated, as lychee seeds are abundant and inexpensive. However, the seeds of Long Yan (龙眼, longan, Dimocarpus longan) can sometimes be confused with lychee seeds, since both are from the Sapindaceae family and appear somewhat similar. Longan seeds are generally rounder and darker black-brown, while lychee seeds are more elongated, lighter reddish-brown, and glossy. When purchasing dried seeds, ensure they are not hollow, insect-eaten, or substituted with seeds from other Sapindaceae species. Different lychee cultivars produce seeds of varying sizes; the larger, more plump seeds are preferred for medicinal use.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Li Zhi He

Non-toxic

Li Zhi He is classified as non-toxic in the Chinese Pharmacopoeia and in classical texts such as the Ben Cao Gang Mu, which explicitly states it is 'sweet, warm, astringent, non-toxic' (甘，温，涩，无毒). It does not contain known toxic compounds at standard dosage. The active compound alpha-methylene cyclopropyl glycine (found in lychee seeds) has hypoglycemic properties, so very large doses could theoretically cause low blood sugar in susceptible individuals. At standard medicinal dosages (5-10g in decoction), no toxicity concerns have been reported.

Contraindications

Situations where Li Zhi He should not be used or requires extra caution

Caution

Not suitable for people without cold-damp Qi stagnation. As the classical text Ben Cao Cong Xin states, those without cold-dampness and stagnant Qi should not take this herb. Using it when there is no cold pattern may worsen Heat conditions.

Caution

Use with caution in Yin-deficient or Heat-excess constitutions. The warm nature of Li Zhi He may aggravate internal Heat or dry up Yin fluids in people with Yin deficiency or excess Heat patterns.

Caution

Use with caution in patients with damp-Heat patterns. The warming, Qi-moving nature of this herb is designed for cold stagnation and may worsen damp-Heat conditions.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific pregnancy contraindication is recorded in classical texts for Li Zhi He. However, as a warm, Qi-moving herb that acts on the Liver channel, it should be used with caution during pregnancy. Its Qi-moving properties could theoretically stimulate uterine activity. Pregnant women should consult a qualified practitioner before use and it should generally be avoided in the absence of a clear cold-stagnation indication.

Breastfeeding

No specific contraindication for breastfeeding is recorded in classical or modern sources. Li Zhi He is non-toxic and generally considered low-risk. However, as with most medicinal herbs, it should only be used during breastfeeding under practitioner guidance. There is no data on whether its active components transfer into breast milk.

Children

Li Zhi He is occasionally used in paediatric practice for conditions such as childhood hernia (shan qi), but the dosage should be reduced proportionally to the child's age and weight (typically one-third to one-half of the adult dose). It should only be used under the supervision of a qualified practitioner. Not generally recommended for very young children without specific indication.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Li Zhi He

Hypoglycemic medications: Pharmacological research has demonstrated that lychee seed extracts have significant blood-sugar-lowering effects. Patients taking oral hypoglycemic agents (such as metformin or sulfonylureas) or insulin should exercise caution, as concurrent use may potentiate the hypoglycemic effect and risk excessively low blood sugar. Blood glucose should be monitored closely if this herb is taken alongside diabetes medications.

Anticoagulant/antiplatelet drugs: No specific interaction has been documented, but as Li Zhi He moves Qi and Blood, theoretical caution is warranted in patients on warfarin or similar medications.

Dietary Advice

Foods and dietary considerations when taking Li Zhi He

When taking Li Zhi He for cold-stagnation pain, avoid cold and raw foods, iced drinks, and cooling fruits, as these may counteract the herb's warming, Qi-moving effect. Warm, easily digestible foods are encouraged. If being used for Liver Qi stagnation conditions, also reduce intake of greasy, heavy foods and alcohol that burden the Liver.

Botanical Description

Physical characteristics and morphology of the Li Zhi He source plant

Lychee (Litchi chinensis Sonn.) is an evergreen tree in the Sapindaceae (soapberry) family. It typically grows to 5–15 metres tall, with a round, dense canopy and a smooth grey trunk. The leaves are leathery, pinnately compound with 4–8 pairs of elliptic to lanceolate, glossy leaflets that are reddish when young, maturing to bright green. Small yellowish-white flowers appear in many-branched terminal panicles 5–30 cm long. The fruit is roughly round to oval, about 2.5 cm in diameter, covered in a bumpy red pericarp (skin). Inside lies the translucent, juicy white aril (the edible flesh), which encloses a single hard seed.

The medicinal part, Li Zhi He, is this seed. It is oval to elongated, slightly flattened, 1.5–2.2 cm long and 1–1.5 cm in diameter, with a smooth, glossy reddish-brown to purplish-brown surface. The tree thrives in tropical to subtropical climates with warm temperatures and high humidity, and is widely cultivated in southern China.

Sourcing & Harvesting

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

Harvesting season

Summer (June to August), when the lychee fruit is fully ripe. Seeds are collected after eating or processing the fruit flesh, then washed and sun-dried.

Primary growing regions

Primarily produced in Fujian, Guangdong, and Guangxi provinces in southern China. Guangdong (especially Maoming and Zhanjiang) and Fujian (especially Putian, known as 'Lychee City') are considered the premium producing regions (dao di yao cai). Lychee is also cultivated in Hainan, Sichuan, Yunnan, and Taiwan, as well as in tropical regions of Southeast Asia and India.

Quality indicators

Good quality Li Zhi He seeds are large, plump, and full-bodied with a smooth, glossy surface that is reddish-brown to purplish-brown in colour. The surface should have slight depressions and fine wavy lines, with a clearly visible round yellowish-brown hilum (seed scar) at one end, about 7mm in diameter. The seed should feel very hard and solid. When cut, the two cotyledons inside should be brownish-yellow. The aroma is faint, and the taste is mildly sweet, slightly bitter, and astringent. Avoid seeds that are small, shrivelled, dull in colour, insect-damaged, or mouldy.

Classical Texts

Key passages from the classical Chinese medical texts that describe Li Zhi He and its therapeutic uses

Ben Cao Yan Yi 《本草衍义》 (Song Dynasty, 1116 AD)

Original: 「以核慢火中烧存性，为末，新酒调一枚末服，治心痛及小肠气。」

Translation: "Slowly roast the seed in fire until charred (retaining its properties), grind to powder, and take one seed's worth mixed with fresh wine. Treats heartache and Small Intestine Qi pain."

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

Original: 「荔枝核入厥阴，行散滞气。其实双结而核肖睾丸，故其治颓疝卵肿，有述类象形之义。」

Translation: "Lychee seed enters the Jue Yin (Liver) channel and disperses stagnant Qi. The paired seeds resemble testicles in form, hence its use in treating hernias and testicular swelling follows the principle of 'like treats like' (doctrine of signatures)."

Ben Cao Gang Mu 《本草纲目》

Original: 「行散滞气。治颓疝气痛，妇人血气刺痛。」

Translation: "Moves and disperses stagnant Qi. Treats hernia pain and women's stabbing pain from Blood and Qi stagnation."

Ben Cao Bei Yao 《本草备要》

Original: 「散滞气，辟寒邪。治胃脘痛。」

Translation: "Disperses stagnant Qi, expels cold pathogenic factors. Treats epigastric pain."

Ben Cao Cong Xin 《本草从新》

Original: 「无寒湿滞气者勿服。」

Translation: "Those without cold-damp Qi stagnation should not take it."

Historical Context

The history and evolution of Li Zhi He's use in Chinese medicine over the centuries

Li Zhi He (lychee seed) was first recorded as a medicine in the Song Dynasty text Ben Cao Yan Yi (本草衍义, 1116 AD) by Kou Zongshi, where it was described as a treatment for heart pain and Small Intestine Qi pain when charred and taken with wine. The lychee fruit itself has a much longer history, first appearing in Sima Xiangru's Shang Lin Fu (上林赋) from the Western Han Dynasty (circa 2nd century BCE), where it was written as "li zhi" (离支), meaning "cut from the branch," because it spoils quickly once separated from the tree.

Li Shizhen's Ben Cao Gang Mu (Ming Dynasty) provided the most influential classical analysis, noting that the paired shape of the seed resembles testicles, explaining its traditional use for hernias and testicular conditions through the "doctrine of signatures" (以形补形). Several famous formulas feature the seed, including Li Xiang San (荔香散) from Zhang Jingyue's Jing Yue Quan Shu, which pairs it with Mu Xiang for chronic epigastric pain, and Li He San (荔核散) from Shi Yi De Xiao Fang for severe testicular swelling. A popular folk tale attributes the discovery of lychee seed's medicinal use to the Tang Dynasty poet Bai Juyi, whose wife is said to have accidentally found that the seeds could treat hernia.

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Li Zhi He

1

Lychee Seed as a Potential Hypoglycemic Agent, and Exploration of its Underlying Mechanisms (Systematic Review, 2021)

Zhang Y, Jin D, An X, Duan L, Duan Y, Lian F. Frontiers in Pharmacology, 2021, 12: 737803.

This review summarized the evidence for lychee seed's blood-sugar-lowering effects. Studies in cells and animal models showed that lychee seed extracts improve insulin resistance, reduce blood glucose, regulate lipid metabolism, and offer kidney and nerve protection in diabetic conditions. The authors concluded lychee seed shows promising potential as a natural hypoglycemic agent, though more human clinical trials are needed.

2

A Review on the Medicinal Potential, Toxicology, and Phytochemistry of Litchi Fruit Peel and Seed (Review, 2021)

Chukwuma CI, Izu GO, Chukwuma MS, Samson MS, Makhafola TJ, Erukainure OL. Journal of Food Biochemistry, 2021, 45(12): e13997.

This review analysed published research on the medicinal and phytochemical profiles of litchi peel and seed. The seed was found to contain bioactive compounds exhibiting antioxidant, antidiabetic, cancer-preventive, anti-obesity, and anti-inflammatory properties. The authors noted that appropriate toxicity studies are still lacking and called for further investigation.

3

Polyphenol-Rich Extract from Litchi chinensis Seeds Alleviates Hypertension-Induced Renal Damage in Rats (Preclinical Study, 2021)

Yao Y, Liu T, Yin L, Man S, Ye S, Ma L. Journal of Agricultural and Food Chemistry, 2021, 69(7): 2138-2148.

Polyphenol-rich lychee seed extract was given to hypertensive rats and found to reduce systolic blood pressure and protect the kidneys from hypertension-related damage. The protective effect was mediated through reduced inflammation and oxidative stress. The extract also beneficially altered gut microbiota, increasing Lactobacillus and short-chain fatty acid production.

4

Litchi chinensis: Medicinal Uses, Phytochemistry, and Pharmacology (Review, 2015)

Ibrahim SR, Mohamed GA. Journal of Ethnopharmacology, 2015, 174: 492-513.

A comprehensive review of litchi's traditional uses, chemical constituents, and pharmacological activities. Extracts and pure compounds showed significant antioxidant, anticancer, anti-inflammatory, antimicrobial, antiviral, antidiabetic, anti-obesity, hepatoprotective, and immunomodulatory properties. From a safety perspective, litchi fruit juice and extracts were found to be safe at doses up to 1 g/kg in animal studies.

5

Systemic Perturbations of Key Metabolites in Type 2 Diabetic Rats Treated by Polyphenol Extracts from Litchi chinensis Seeds (Preclinical Study, 2017)

Man S, Ma J, Yao J, Cui J, Wang C, Li Y, Ma L, Lu F. Journal of Agricultural and Food Chemistry, 2017, 65(35): 7698-7704.

Lychee seed polyphenol extract was administered to type 2 diabetic rats. The extract decreased insulin resistance and blood glucose levels by enhancing pancreatic function, upregulating glucose transporter expression, and restoring impaired insulin signalling pathways in the liver. The study demonstrated that lychee seed extracts broadly regulate glucose and fatty acid metabolism.

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.