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

Fei Zi

Torreya seed · 榧子

Torreya grandis Fort. · Semen Torreyae

Also known as: Fei Shi (榧实), Xiang Fei (香榧)

Fei Zi (Torreya seed) plant

Images shown are for educational purposes only

Torreya seed is a mild, gentle herb best known for expelling intestinal parasites such as tapeworms, hookworms, and roundworms without harsh side effects. Its oily, sweet nature also makes it useful for dry coughs and constipation caused by intestinal dryness. Unlike many antiparasitic herbs, it is pleasant-tasting and does not damage the stomach, making it particularly suitable for children.

Category Parasite-expelling herbs (驱虫药)
Therapeutic focus Digestive Health Intestinal Parasite Support Respiratory Health Digestive Regularity

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān), Astringent (涩 sè)

Channels entered

Lungs, Stomach, Large Intestine

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

Therapeutic focus

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

Digestive Health Intestinal Parasite Support Respiratory Health Digestive Regularity

TCM Actions

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

Expels Parasites Resolves Accumulation Moistens the Lungs and Stops Cough Moistens the Intestines and Unblocks the Bowels

How these actions work

'Kills parasites' is the primary and most famous action of Torreya seed. The oil-rich seed contains compounds that can paralyze and expel various intestinal worms, including tapeworms, hookworms, roundworms, and pinworms. Unlike many antiparasitic herbs that are bitter and harsh on the digestive system, Torreya seed is sweet and gentle, so it does not require additional purgatives to flush out the dead parasites and does not irritate the stomach. This makes it especially well-suited for treating worm infestations in children.

'Disperses accumulation' means Torreya seed helps break down stagnant food and digestive buildup, particularly in cases of childhood nutritional impairment (known as 'gan ji' or accumulation disorder). Children who are thin, yellow-faced, have poor appetites, and distended abdomens from chronic digestive weakness and possible parasites can benefit from this herb's gentle dispersing action.

'Moistens the Lungs and stops coughing' refers to the herb's ability to nourish dry Lung tissue and relieve coughs caused by dryness rather than by infection or phlegm. Its rich oil content provides a lubricating, moistening quality that soothes dry, irritated airways. This applies to dry, unproductive coughs that worsen in dry weather or dry indoor environments.

'Moistens the intestines and unblocks the bowels' works through the same oil-rich, lubricating nature. For people with constipation caused by dryness in the intestines (rather than by heat or Qi stagnation), the fats in Torreya seed help lubricate the bowel and ease passage. This action also makes it helpful for hemorrhoids accompanied by dry, difficult stools.

Patterns Addressed

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

Why Fei Zi addresses this pattern

Torreya seed's sweet, neutral nature and its entry into the Stomach and Large Intestine channels make it ideally suited for addressing intestinal parasite infestations. Its oil-rich composition contains compounds that paralyze and expel worms directly. Unlike bitter, cold antiparasitic herbs that can damage the Spleen and Stomach, Torreya seed's sweetness actually supports digestive function while killing parasites. Its gentle moistening quality also helps the body expel dead parasites naturally through the bowels without needing additional harsh purgatives.

A practitioner would look for one or more of these signs

Abdominal Pain

Worm-related abdominal pain, often intermittent and around the navel

Loss Of Appetite

Poor appetite due to parasitic burden

Emaciation

Wasting and weight loss, especially in children

Nausea

Nausea associated with worm infestation

Commonly Used For

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

Arises from: Intestinal Parasite

TCM Interpretation

In TCM, intestinal parasites are understood as 'chong ji' (worm accumulation), a condition where parasites settle in the gastrointestinal tract, consuming the body's nutrients and obstructing normal Spleen and Stomach function. Hookworm disease specifically depletes Qi and Blood over time because the worms feed on blood, leading to a pale complexion, fatigue, and general weakness. The presence of worms also creates local stagnation and pain in the abdomen, particularly around the navel area.

Why Fei Zi Helps

Torreya seed directly kills and expels hookworms through its oil-based active compounds. Its entry into the Stomach and Large Intestine channels means it acts precisely where the parasites reside. Crucially, its sweet, neutral nature means it does not further weaken the already depleted Spleen and Stomach the way harsh, bitter antiparasitic herbs might. Clinical reports have documented successful hookworm clearance using daily doses of roasted Torreya seeds over approximately one month, with stool examinations confirming elimination of worm eggs.

Also commonly used for

Hookworm Infection

Ascaris lumbricoides infestation with abdominal pain

Tapeworm Infection

Classical texts specifically note efficacy against tapeworm ('cun bai chong')

Hookworm Infection

Often combined with Shi Jun Zi for pinworm

Hemorrhoids

When accompanied by dry, difficult stools

Dry Cough

Lung dryness type with minimal phlegm

Malnutrition In Children

Childhood accumulation disorder (gan ji) with emaciation

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), Astringent (涩 sè)

Channels Entered

Lungs Stomach Large Intestine

Parts Used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

Dosage & Preparation

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

Standard dosage

9-15g

Maximum dosage

Up to 50g in decoction for antiparasitic use (taken as a single large dose on an empty stomach), or 40 roasted kernels chewed and eaten. Doses above this may cause gastrointestinal discomfort due to the high oil content.

Dosage notes

For antiparasitic purposes (roundworm, hookworm, tapeworm), use the higher end of the dosage range (30-50g in decoction, or 30-40 roasted kernels eaten on an empty stomach), often as a single large dose or over several consecutive days. For a classical tapeworm protocol, 7 seeds per day for 7 days was recommended. For chronic conditions like constipation and hemorrhoids, use smaller doses (9-15g) taken regularly over a longer period. The seeds can be decocted with the shell on (cracked open before adding to the pot) or the kernels can be roasted and eaten directly. Combining with Shi Jun Zi (Quisqualis fruit) and garlic enhances antiparasitic efficacy.

Preparation

When used in decoction, the seeds should be cracked open (with the shell on) or sliced before adding to the pot to allow the active constituents to be extracted. Chen Shiduo specifically recommended slicing the seeds for decoction use. For antiparasitic purposes, the roasted kernels are often chewed and eaten directly rather than decocted, as this delivers the oil-based active compounds more effectively.

Processing Methods

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

Processing method

The cleaned seed kernels are dry-fried (or stir-fried with hot sand) until the exterior turns brownish-black and the interior becomes yellow, with a fragrant toasted aroma developing.

How it changes properties

Stir-frying does not significantly change the thermal nature (remains neutral) but makes the seed more fragrant and easier to digest. The roasting enhances the herb's ability to disperse food accumulation and strengthens its palatability, especially for children. The oil becomes more accessible, slightly enhancing the lubricating intestinal effect while reducing any mild astringency.

When to use this form

The roasted form is preferred for treating childhood accumulation disorder (gan ji) and for general food stagnation, as the enhanced flavor makes it easier to administer to children. It is also commonly used when the herb is chewed directly rather than decocted, since roasting makes it more palatable and digestible.

Common Herb Pairs

These ingredients are traditionally combined with Fei Zi for enhanced therapeutic effect

Shi Jun Zi
Shi Jun Zi 1:1 (e.g. Fei Zi 30g : Shi Jun Zi 30g)

Torreya seed and Shi Jun Zi (Quisqualis fruit) are both sweet-flavored antiparasitic herbs that kill intestinal worms without damaging the Spleen and Stomach. Together they broaden the spectrum of parasite coverage: Shi Jun Zi is particularly effective against roundworms, while Torreya seed is classically noted for its strength against tapeworms. Their combined action provides comprehensive antiparasitic treatment while remaining gentle on digestion.

When to use: Mixed intestinal parasite infestations, especially in children who cannot tolerate harsh, bitter antiparasitic herbs. Also used when worm-related abdominal pain is accompanied by poor appetite and emaciation.

Bing Lang
Bing Lang 1:1 (e.g. Fei Zi 30g : Bing Lang 30g)

Torreya seed moistens and kills parasites, while Bing Lang (Areca seed) powerfully drives Qi downward and promotes bowel movement, flushing dead parasites out of the body. Torreya seed's gentle, moistening nature complements Bing Lang's stronger purgative action, creating a combination that both kills worms and ensures their prompt expulsion.

When to use: Tapeworm and other large intestinal parasite infestations where dead worms need to be actively expelled. Particularly useful when parasites are firmly lodged and simple killing is not enough.

Wu Mei
Wu Mei Fei Zi 30g : Wu Mei 10g

Torreya seed kills parasites while Wu Mei (dark plum) uses its intensely sour taste to calm and immobilize worms, preventing them from moving erratically and causing pain. The combination first pacifies the parasites (Wu Mei) and then kills them (Torreya seed), reducing the risk of worms burrowing deeper or migrating in response to the antiparasitic treatment.

When to use: Worm-related abdominal pain where the parasites are actively causing cramping and distress. Especially useful in biliary ascariasis or when roundworms are agitated and causing severe colicky pain.

Huo Ma Ren
Huo Ma Ren 1:1 (e.g. Fei Zi 15g : Huo Ma Ren 15g)

Both herbs are oil-rich seeds that moisten and lubricate the intestines. Together they provide enhanced bowel-moistening action for stubborn dry constipation. Torreya seed adds mild accumulation-dispersing action while Huo Ma Ren (hemp seed) focuses purely on moistening and unblocking.

When to use: Chronic constipation from intestinal dryness, particularly in elderly patients or those recovering from illness where intestinal fluids are depleted.

Comparable Ingredients

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

Shi Jun Zi
Fei Zi vs Shi Jun Zi

Both are sweet, gentle antiparasitic herbs safe for children, but they differ in their specialties: Shi Jun Zi is most effective against roundworms (Ascaris) and is considered the primary herb for childhood worm diseases with accumulation disorder, while Torreya seed has a broader spectrum and is classically highlighted for tapeworms. Torreya seed also has significant moistening actions for dry cough and constipation that Shi Jun Zi lacks. As noted in the Ben Cao Gang Mu, both are unusually sweet among antiparasitic herbs, which are typically bitter.

Bing Lang
Fei Zi vs Bing Lang

Both expel intestinal parasites, but Bing Lang is far more powerful and aggressive. It strongly breaks Qi downward, drives parasites out by force, and acts as a purgative. Torreya seed works more gently, killing parasites through its oil-based compounds and allowing them to pass naturally. Bing Lang is better for acute, severe infestations requiring forceful expulsion, while Torreya seed is better for milder cases, children, or patients too weak to tolerate Bing Lang's harsh downward-driving nature.

Ku Lian Pi
Fei Zi vs Ku Lian Pi

Both kill intestinal parasites, but Ku Lian Pi (Melia bark) is bitter and cold with slight toxicity, making it powerful but potentially harmful to the Spleen and Stomach. Torreya seed is sweet, neutral, and non-toxic, so it can be used safely over longer periods and in weaker patients or children. Ku Lian Pi is chosen when a stronger antiparasitic action is needed and the patient's digestion is robust enough to tolerate it.

Common Substitutes & Adulterants

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

The most important adulterant to watch for is the seed of Cephalotaxus (san jian shan / cu fei, 三尖杉 / 粗榧). These seeds are spindle-shaped, smaller (about 2-2.5 cm), reddish-brown with longitudinal striations, and have a slightly bitter taste. Unlike true Fei Zi, Cephalotaxus seeds are recorded as toxic in classical sources and do not share the same antiparasitic actions. The shell of true Fei Zi snaps open to reveal a reddish-brown interior with a mesh pattern, while the Cephalotaxus shell is hard but not crisp and the kernel shows distinct ridges with reddish-brown or whitish scale-like hairs. True Fei Zi has a mild, pleasant sweetness, whereas the adulterant tastes slightly bitter. Always verify identity before 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 Fei Zi

Non-toxic

Fei Zi is classified as non-toxic in both classical texts and the Chinese Pharmacopoeia. It has a long history of safe use as both food and medicine. The Ming Yi Bie Lu records that one can eat one to two jin (roughly 500-1000g) without ill effect. However, overconsumption of the oily seeds may cause loose stools due to their lubricating effect on the intestines. One classical warning from Zhu Danxi notes that excessive consumption may draw Fire into the Lungs. The related Japanese species Torreya nucifera has been reported to contain alkaloids with uterine-contracting properties, but this should not be confused with the Chinese species T. grandis used medicinally. The common adulterant, Cephalotaxus (san jian shan) seeds, is noted in classical sources as toxic and must not be substituted for true Fei Zi.

Contraindications

Situations where Fei Zi should not be used or requires extra caution

Caution

Spleen deficiency with diarrhea or loose stools. Fei Zi has a lubricating, bowel-moistening quality that can worsen existing diarrhea or soft stools in people with weak digestion.

Caution

Intestinal slipperiness (chang hua) with unformed stools. The oily, moistening nature of the seeds may aggravate this condition.

Caution

Concurrent consumption with mung beans (green beans). Classical sources note that Fei Zi is incompatible with mung beans (fan lu dou), which may cause diarrhea.

Caution

Excessive consumption in people with Heat signs, sore throat with yellow phlegm, or cough from Lung Heat. Overconsumption is said to draw Fire into the Lungs.

Classical Incompatibilities

Traditional Chinese pharmacological incompatibilities — herbs or substances to avoid combining with Fei Zi

Fei Zi does not appear on the classical Eighteen Incompatibilities (shi ba fan) or Nineteen Mutual Fears (shi jiu wei) lists. However, classical sources (notably the Ben Cao Bei Yao) record that Fei Zi is incompatible with mung beans (lu dou), stating 'fan lu dou' (antagonizes mung beans). This is a food incompatibility warning rather than a formal entry on the canonical lists.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use with caution during pregnancy. A related species (Torreya nucifera, the Japanese torreya) has been reported to contain alkaloids with uterine-contracting properties and has been used as a folk abortifacient. Although the Chinese species T. grandis used medicinally has not been specifically studied for this effect, caution is advised as a precaution. The oily, bowel-loosening nature of Fei Zi is an additional minor concern. Pregnant women should consult a qualified practitioner before use.

Breastfeeding

No specific safety data exists for Fei Zi during breastfeeding. As a food-grade seed with non-toxic classification and a long history of dietary use, it is generally considered low risk at standard doses. However, its oily nature and bowel-loosening effect could theoretically affect the nursing infant through breast milk. Use at standard medicinal doses only under practitioner guidance.

Children

Fei Zi has a long tradition of safe use in children, particularly for intestinal parasites and childhood nutritional impairment (gan ji, a pattern of wasting and yellowish complexion from worm infestation or malnutrition). The Ri Yong Ben Cao specifically notes it for children who are 'yellow and thin with worm accumulation.' Because of its sweet taste and food-grade safety, it is considered one of the gentler antiparasitic options for pediatric use. Children can eat roasted seeds directly (typically 5-10 kernels per day for young children, adjusted by age and body weight), or a reduced decoction dose of roughly one-third to one-half the adult dose. Avoid use in children with diarrhea or weak digestion.

Drug Interactions

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

No well-documented pharmaceutical drug interactions have been reported for Fei Zi. However, based on its pharmacological properties, the following theoretical considerations apply:

  • Laxatives: The bowel-moistening and mildly laxative effect of Fei Zi could potentiate the effects of pharmaceutical laxatives, increasing the risk of diarrhea or electrolyte imbalance.
  • Anticoagulant/antiplatelet drugs: The seeds are rich in unsaturated fatty acids. While no direct interaction has been documented, high-dose concurrent use with blood-thinning medications should be monitored as a general precaution.
  • Anthelmintic drugs: Concurrent use with pharmaceutical antiparasitic agents (albendazole, mebendazole, praziquantel) has not been studied. Additive effects are theoretically possible.

These are theoretical considerations based on the herb's known properties, not confirmed clinical interactions. No pharmacokinetic interaction studies (e.g. CYP450 effects) have been published for Fei Zi.

Dietary Advice

Foods and dietary considerations when taking Fei Zi

Avoid eating mung beans (green beans) while taking Fei Zi, as classical sources specifically warn against this combination. Because Fei Zi moistens the intestines, avoid consuming other strongly oily or greasy foods at the same time if the person already tends toward loose stools. For antiparasitic use, taking Fei Zi on an empty stomach enhances its effectiveness against intestinal worms. Light, easily digested foods are recommended during a course of antiparasitic treatment.

Botanical Description

Physical characteristics and morphology of the Fei Zi source plant

Fei Zi comes from the Torreya tree (Torreya grandis Fort.), a large evergreen conifer in the Taxaceae (yew) family. The tree can reach up to 25 metres tall with a trunk diameter of over 50 cm. Its bark is pale greyish-yellow to grey-brown with irregular vertical fissures. The leaves are narrow and linear, arranged in two rows along the branches, resembling those of the Chinese fir (Cunninghamia) but smaller, typically 1.1 to 2.5 cm long, dark glossy green above and pale green below with two whitish stomatal bands.

Torreya trees are dioecious, meaning male and female flowers grow on separate trees. Male pollen cones are small and round, borne singly in the leaf axils. Female structures occur in pairs in the leaf axils, each bearing a single ovule enclosed in a fleshy aril. The fruit-like seeds are elliptical to ovoid, 2 to 4.5 cm long, with a fleshy purplish-brown outer coating (false seed coat) dusted with white powder when ripe. Remarkably, the seeds take two full years from pollination to maturity, so trees commonly bear two generations of developing seeds simultaneously, a phenomenon called "three generations on one tree" (san dai tong shu). Flowering occurs in April, and seeds ripen in October of the following year.

The tree prefers warm, humid, shaded mountain slopes with deep, fertile acidic soils, growing in subtropical forests at elevations from near sea level up to about 1,400 metres. It is a slow-growing, long-lived species, with some specimens surviving over 400 to 500 years. Torreya grandis is endemic to China and is classified as a national second-class protected wild plant.

Sourcing & Harvesting

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

Harvesting season

Autumn (October to November), when the seeds ripen in the year following pollination. The fleshy outer aril is removed, and the seeds are washed and sun-dried.

Primary growing regions

Fei Zi is endemic to southeastern China. The premier production region (dao di yao cai) is Zhejiang Province, particularly the Kuaiji Mountain area including Zhuji, Dongyang, Shengzhou, and Shaoxing, where Torreya trees have been cultivated for over 1,300 years. The famous edible cultivar 'Xiang Fei' (fragrant torreya) originates from this region. Other producing areas include southern Anhui (especially around Huangshan), northern Fujian (Wuyi Mountain region), northern Jiangxi, southern Jiangsu, and scattered locations in Hunan and Guizhou. Zhejiang Province holds the vast majority of China's Torreya resources, with over 600,000 trees, including many centuries-old specimens.

Quality indicators

Good quality Fei Zi seeds are large, ovoid, with thin shells. The outer surface should be greyish-yellow to light yellowish-brown with visible longitudinal wrinkles. One end is blunt and rounded with a pale oval scar (the seed hilum), the other end slightly pointed. The shell should be hard and crisp, snapping cleanly to reveal a reddish-brown inner surface with a mesh-like pattern. The kernel (seed meat) inside should be plump, firm, and wrinkled on the surface with a greyish-brown membrane. The inner endosperm should be yellowish-white, oily but not greasy or rancid. The aroma should be faintly fragrant (more pronounced when roasted), and the taste mildly sweet with a slight astringency that becomes more pleasant with prolonged chewing. Avoid seeds that are broken, cracked, oily on the surface (indicating rancidity), hollow, or infested with insects. Store in a cool, dry place to prevent spoilage.

Classical Texts

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

Shen Nong Ben Cao Jing (The Divine Farmer's Classic of Materia Medica)

Original: 主腹中邪气，去三虫，蛇螫。

Translation: "Governs pathogenic Qi in the abdomen, eliminates the three types of worms, and treats snakebite."

Ming Yi Bie Lu (Supplementary Records of Famous Physicians)

Original: 能消谷，助筋骨，行营卫，明目轻身，令人能食。

Translation: "It can aid digestion, strengthen the sinews and bones, promote the movement of nutritive and defensive Qi, brighten the eyes, lighten the body, and increase the appetite."

Ben Cao Xin Bian (New Compilation of Materia Medica, by Chen Shiduo, Qing dynasty)

Original: 榧子杀虫最胜，但从未有用入汤药者，切片用之至妙。凡杀虫之物，多伤气血，惟榧子不然。

Translation: "Fei Zi is supreme at killing worms, but it was previously never used in decoctions. Slicing it for decoction works wonderfully. Most antiparasitic substances damage Qi and Blood, but Fei Zi does not."

Ben Cao Gang Mu (Comperta of Materia Medica, by Li Shizhen, Ming dynasty)

Original: 常食，治三痔，去三虫蛊毒，鬼疟恶毒。

Translation: "When eaten regularly, it treats the three types of hemorrhoids, eliminates the three worms and gu-toxin, and resolves malarial and noxious poisons."

Ben Cao Jing Shu (Commentary on the Classic of Materia Medica, by Miao Xiyong, Ming dynasty)

Original: 榧实，味甘无毒，然尝其味，多带微涩。五痔三虫，皆大肠湿热所致，苦寒能泻湿热，则大肠清宁而二证愈矣。

Translation: "Fei Zi is sweet and non-toxic, though when tasted it has a slightly astringent quality. Hemorrhoids and intestinal worms both arise from Damp-Heat in the Large Intestine. Its ability to drain Damp-Heat restores clarity and calm to the Large Intestine, thus curing both conditions."

Historical Context

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

Fei Zi has a long and distinguished history in Chinese civilization, dating back over 2,000 years. The earliest record of the Torreya tree appears in the Er Ya (circa 2nd century BCE), China's oldest surviving dictionary, where it was called 'bi' (彼) and described as resembling a fir with fine, soft wood suitable for making utensils. Its medicinal use was first documented in the Shen Nong Ben Cao Jing, where it was listed as a lower-grade drug for expelling abdominal pathogens and intestinal worms.

The Song dynasty poet Su Shi (Su Dongpo, 1037-1101) gave Fei Zi one of its literary names, 'Yu Shan Guo' (Jade Mountain Fruit), celebrating it in a poem as a precious delicacy and noting its antiparasitic virtues. By the Tang dynasty (618-907), people in the Kuaiji Mountain region of Zhejiang began eating the seeds as food, and superior cultivars were gradually selected through grafting. The name 'Xiang Fei' (fragrant torreya) first appeared in the Qing dynasty Qianlong Zhuji County Gazetteer. Chen Shiduo, in his Qing dynasty Ben Cao Xin Bian, was notably the first to advocate using Fei Zi in decoctions (rather than simply eating the seeds), reporting that sliced seeds in decoction gave immediate relief for worm-related abdominal pain. A distinctive feature praised across classical texts is that unlike most antiparasitic herbs, which tend to be bitter and harsh on digestion, Fei Zi is sweet and gentle, killing worms without damaging Qi or Blood.

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Fei Zi

1

Bioassay-guided isolation of active substances from Semen Torreyae identifies two new anthelmintic compounds with novel mechanism of action (Preclinical, 2018)

Liu M, Veryser C, Lu JG, Wenseleers T, De Borggraeve WM, Jiang ZH, Luyten W. Journal of Ethnopharmacology, 2018, 224, 421-428.

This study used the nematode C. elegans as a model to identify the active antiparasitic compounds in Fei Zi for the first time. Researchers isolated two compounds, galangal acetate and miogadial, which showed dose-dependent activity against the worms. Importantly, nematode strains resistant to conventional anthelmintic drugs did not show cross-resistance to these compounds, suggesting a novel mechanism of action. The two compounds also acted synergistically together.

PubMed
2

Antioxidative and acute anti-inflammatory effects of Torreya grandis (Preclinical, 2006)

Saeed MK, Deng Y, Dai R, Li W, Yu Y, Iqbal Z, Yu K. Fitoterapia, 2006, 77(7-8), 592-594.

This study from Peking University investigated the antioxidant and anti-inflammatory properties of an ethanol extract of Torreya grandis seeds. The extract protected human skin fibroblasts from hydrogen peroxide damage, scavenged free radicals (DPPH and superoxide), and dose-dependently reduced ear swelling in mouse models of acute inflammation when applied topically.

PubMed
3

Ethanol extracts from Torreya grandis seed have potential to reduce hyperuricemia in mouse models by influencing purine metabolism (Preclinical, 2024)

Chen Y, Pan H, Hao S, Pan D, Wang G, Yu W. Foods, 2024, 13(6), 840.

This study evaluated Torreya grandis seed ethanol extract in mice with induced high uric acid levels. The extract significantly reduced blood uric acid by 71.9%, comparable to the standard drug allopurinol. It inhibited the liver enzyme xanthine oxidase, reduced inflammation and oxidative stress in the kidneys, and positively altered gut bacteria composition. The active components were identified as flavonoids and phenolic compounds.

Link

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.