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

Bai Guo

Ginkgo seed · 白果

Ginkgo biloba L. · Ginkgo Semen

Also known as: Yin Xing, 银杏, Ginkgo nut,

Bai Guo (Ginkgo seed) plant

Images shown are for educational purposes only

Ginkgo seed is a traditional Chinese herb used primarily for respiratory conditions like asthma and chronic cough with heavy phlegm, as well as for excessive vaginal discharge and frequent urination. It works by restraining and stabilizing bodily functions that have become 'leaky' or overactive. Note that ginkgo seed is different from the ginkgo leaf extract commonly sold as a supplement for memory, and it is mildly toxic when raw, so it must always be cooked and used in controlled amounts.

Category Astringent / Stabilizing herbs (收涩药)
Therapeutic focus Respiratory Health Urinary Health Women's Health Asthma and Wheezing Relief

TCM Properties

Temperature

Neutral

Taste

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

Channels entered

Lungs, Kidneys

Parts used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

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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 Bai Guo does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Bai Guo is primarily used to support these areas of health:

Respiratory Health Urinary Health Women's Health Asthma and Wheezing Relief

TCM Actions

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

Astringes the Lungs and calms wheezing Expels Phlegm Astringes to Stop Vaginal Discharge Secures Essence and Stops Enuresis

How these actions work

'Astringes the Lungs and calms wheezing' means Bái Guǒ tightens and restrains the Lung Qi that has become rebellious (rising upward) and causing coughing or wheezing. Its astringent nature helps hold the Lungs' Qi in check so it descends properly rather than rushing upward. This is why it is a key herb for chronic or acute asthma and cough with copious phlegm. Because Bái Guǒ is neutral in temperature, it can be combined with either warming or cooling herbs depending on whether the cough pattern involves cold or heat.

'Expels Phlegm' refers to its bitter, descending quality that helps resolve accumulated phlegm in the Lungs. It works by drying dampness and directing phlegm downward, making it particularly useful when thick, copious sputum accompanies wheezing.

'Stops vaginal discharge' means this herb can restrain excessive vaginal discharge (leukorrhea). Its astringent and dampness-eliminating properties address both the underlying dampness and the failure of the lower body to hold fluids in place. It is used for both clear/white discharge from deficiency and yellow discharge from damp-heat when combined appropriately.

'Reduces urination' means Bái Guǒ helps control frequent, excessive, or involuntary urination. By entering the Kidney channel and exerting an astringent effect on the lower body, it stabilizes the Bladder's holding function. This makes it useful for urinary frequency, bedwetting in children, or incontinence due to Kidney Qi weakness.

Important safety note: Bái Guǒ is mildly toxic in its raw form and must always be properly cooked before internal use. Dosages should be carefully controlled.

Patterns Addressed

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

Why Bai Guo addresses this pattern

When phlegm and heat accumulate in the Lungs, the Lung Qi rebels upward, causing wheezing, coughing, and copious yellow sticky phlegm. Bái Guǒ's astringent nature restrains the rebellious Lung Qi and calms wheezing, while its bitter taste helps dry dampness and resolve phlegm. Being neutral in temperature, it does not worsen the heat but effectively binds the Lung Qi. This is why it serves as a co-King herb alongside Má Huáng in Dìng Chuǎn Tāng, where the pairing of one dispersing (Má Huáng) and one astringing (Bái Guǒ) herb creates a balanced approach to clearing the airways without exhausting Lung Qi.

A practitioner would look for one or more of these signs

Wheezing

Wheezing with audible sound in the throat

Hypochondrial Pain That Is Worse On Coughing And Breathing

Cough with copious yellow, sticky phlegm

Shortness Of Breath

Shortness of breath and chest tightness

Yellowish Phlegm

Thick yellow phlegm that is difficult to expectorate

Commonly Used For

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

Arises from: Phlegm-Heat in the Lungs

TCM Interpretation

TCM understands asthma as a disorder of Lung Qi that fails to descend properly. In many people, there is a pre-existing accumulation of phlegm in the Lungs (sometimes called a 'root' of the disease). When triggered by external factors like wind-cold, this phlegm flares up, blocks the airways, and forces Lung Qi upward, producing wheezing and labored breathing. In hot-phlegm presentations, the trapped Qi generates heat, producing thick yellow phlegm. The Lungs lose their ability to open and close properly, which is their fundamental role in breathing.

Why Bai Guo Helps

Bái Guǒ's astringent nature directly addresses the Lungs' failure to control their 'opening and closing' function. By restraining the upward-rushing Lung Qi, it calms wheezing. Its bitter quality also helps dry and resolve the accumulated phlegm. Because it is neutral in temperature, it does not worsen the heat component of the pattern. In the classic formula Dìng Chuǎn Tāng, Bái Guǒ is paired with Má Huáng: one opens the Lungs while the other holds them, creating a balanced approach that clears the airways without depleting Lung Qi.

Also commonly used for

Chronic Bronchitis

Particularly with thick phlegm and wheezing

Frequent Urination

Due to Kidney Qi weakness or Bladder instability

Bedwetting

Childhood enuresis

Hypochondrial Pain That Is Worse On Coughing And Breathing

Chronic cough with profuse sputum

Vaginitis

Including bacterial vaginosis with damp-heat pattern

Urinary Incontinence

Especially in the elderly from Kidney Qi deficiency

Spermatorrhea

From Kidney Qi not consolidating

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), Bitter (苦 kǔ), Astringent (涩 sè)

Channels Entered

Lungs Kidneys

Parts Used

Seed (种子 zhǒng zǐ / 子 zǐ / 仁 rén)

Dosage & Preparation

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

Standard dosage

5-10g

Maximum dosage

Do not exceed 10g in decoction. The Chinese Pharmacopoeia (2020 edition) lists 5-10g as the standard range. As food, adults should not consume more than 10 cooked seeds per day.

Dosage notes

The standard decoction dose is 5-10g. For cough and wheezing, use toward the higher end of the range (8-10g) with appropriate formula combinations. For vaginal discharge or urinary frequency, 5-8g is typically sufficient. Bai Guo must always be used in its processed (cooked) form for internal use. The green embryo (胚芽) should be removed before use, as it contains the highest concentration of toxic compounds. When used in food therapy (congee, soups), limit to 5-8 cooked seeds for adults. External application of raw Bai Guo is used for skin conditions (ringworm, sores) but should only be applied topically, never ingested raw.

Preparation

The seeds must be processed before internal use. Remove the fleshy outer seed coat, crack the hard shell, remove the inner membrane and the green embryo (胚芽, which contains the highest toxin concentration). The seeds are then either briefly steamed or lightly boiled, then dried. When used in decoction, the processed seeds can be crushed (捣碎) before adding to the pot to improve extraction. No special decoction sequence is required (it does not need to be decocted first or added later), but it should be decocted thoroughly.

Processing Methods

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

Processing method

The shelled ginkgo seeds are crushed and dry-fried (stir-fried without additives) until they turn yellow on the outside.

How it changes properties

Dry-frying reduces the toxicity of raw Bái Guǒ, making it safer for internal use. It also strengthens the astringent effect, enhancing its ability to settle wheezing, astringe urination, and stop vaginal discharge. The temperature and channel entry remain essentially unchanged.

When to use this form

This is the standard form used in most decoctions. Use dry-fried Bái Guǒ whenever an internal prescription calls for Bái Guǒ, as the raw form is too toxic to take internally. It is the form used in Dìng Chuǎn Tāng.

Common Herb Pairs

These ingredients are traditionally combined with Bai Guo for enhanced therapeutic effect

Ma Huang
Ma Huang Bái Guǒ 9g : Má Huáng 9g (equal doses, as in Dìng Chuǎn Tāng)

Bái Guǒ astringes and restrains the Lung Qi, while Má Huáng disperses and opens the Lungs. Together they create a 'one opens, one closes' dynamic that powerfully calms wheezing and stops cough without either depleting Lung Qi (as Má Huáng alone might) or trapping pathogens inside (as Bái Guǒ alone might).

When to use: Acute asthma or wheezing attacks with copious phlegm, especially when there is external wind-cold trapping internal phlegm-heat. This is the core pairing in Dìng Chuǎn Tāng.

Shan Yao
Shan Yao Bái Guǒ 12g : Shān Yào 30g (as in Yì Huáng Tāng)

Bái Guǒ astringes and stops discharge while drying dampness. Shān Yào tonifies the Spleen and Kidneys, strengthening the body's ability to hold fluids. Together they address both the root (Spleen-Kidney weakness) and the branch (leaking discharge or frequent urination).

When to use: Vaginal discharge (leukorrhea) from Spleen-Kidney deficiency, or urinary frequency and bedwetting from Kidney Qi weakness. This pairing is central to Yì Huáng Tāng.

Wu Wei Zi
Wu Wei Zi 1:1 (Bái Guǒ 6-10g : Wǔ Wèi Zǐ 6-10g)

Both herbs astringe the Lungs, but through different mechanisms. Bái Guǒ is astringent and bitter, drying phlegm and calming wheezing. Wǔ Wèi Zǐ is sour and astringent, restraining Lung Qi leakage and also tonifying the Kidneys. Together they strongly astringe the Lungs and support the Kidney's Qi-grasping function.

When to use: Chronic cough from Lung deficiency, or Lung-Kidney deficiency wheezing where Qi is not being grasped by the Kidneys.

Huang Qi
Huang Qi Bái Guǒ 12g : Huáng Bǎi 6g (as in Yì Huáng Tāng)

Bái Guǒ astringes the lower body and stops discharge, while Huáng Bǎi clears damp-heat from the lower burner. Together they address both the excess (damp-heat) and the leakage, making them effective for yellow, foul-smelling vaginal discharge.

When to use: Damp-heat type leukorrhea with yellow, thick, foul-smelling discharge. This is the core mechanism in Yì Huáng Tāng.

Key Formulas

These well-known formulas feature Bai Guo in a prominent role

Ding Chuan Tang 定喘湯 King

The definitive formula showcasing Bái Guǒ's Lung-astringing and wheezing-calming action. Here it serves as co-King alongside Má Huáng, with its astringent nature counterbalancing Má Huáng's dispersing force. The formula treats asthma from wind-cold trapping phlegm-heat, and Bái Guǒ's role demonstrates its core identity as a Lung-binding, phlegm-resolving herb. From the Ming dynasty text Shè Shēng Zhòng Miào Fāng.

Yi Huang Tang 易黃湯 Deputy

This formula from Fù Qīng Zhǔ Nǚ Kē showcases Bái Guǒ's second major action: stopping vaginal discharge and eliminating dampness in the lower body. As Deputy herb, it guides the formula into the Ren vessel and provides the astringent force that stops the leakage, while Shān Yào and Qiàn Shí tonify the underlying deficiency. It demonstrates how Bái Guǒ addresses lower burner pathology alongside its respiratory uses.

Comparable Ingredients

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

Wu Wei Zi
Bai Guo vs Wu Wei Zi

Both Bái Guǒ and Wǔ Wèi Zǐ astringe the Lungs to treat cough and wheezing and can address lower burner leakage. However, Bái Guǒ primarily restrains the Lungs to stop wheezing and is most appropriate when there is profuse phlegm, since its bitter taste dries dampness. Wǔ Wèi Zǐ is sour and more broadly tonifying, nourishing the Kidneys and calming the spirit, making it better suited to dry, deficiency-type coughs and conditions with Kidney Yin or essence loss. Bái Guǒ also has a stronger effect on stopping vaginal discharge due to dampness.

Qian Shi
Bai Guo vs Qian Shi

Both herbs astringe the lower body and stop discharge, and both appear together in Yì Huáng Tāng. However, Qiàn Shí primarily tonifies the Spleen and Kidneys while astringing, making it a nourishing astringent. Bái Guǒ focuses more on drying dampness and restraining leakage without significant tonifying action. Qiàn Shí is non-toxic and safe for long-term use, while Bái Guǒ is mildly toxic and must be carefully dosed. Choose Qiàn Shí when the priority is strengthening deficiency; choose Bái Guǒ when dampness and leakage are prominent.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Bai Guo

Bai Guo (Ginkgo seed) is relatively distinctive and not commonly adulterated with other species, as Ginkgo biloba is the only surviving species in its family. However, quality-related issues are more common than species substitution: 1. Old, deteriorated seeds sold as fresh: Dried-out, rancid, or moldy seeds may be mixed with good stock. These are identifiable by their rattling sound when shaken, grayish discoloration, and off-odors. 2. Seeds from roadside ornamental trees: These trees absorb vehicle exhaust, heavy metals, and are often sprayed with pesticides, making them potentially contaminated compared to seeds from cultivated orchards. 3. Confusion with Ginkgo leaf products: Ginkgo biloba leaf extract (银杏叶提取物) is an entirely different medicinal product from the seed (Bai Guo). The leaf extract is used primarily for cardiovascular and cognitive conditions and has different active compounds, indications, and safety profiles. They should never be used interchangeably.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Bai Guo

Toxic

Bai Guo is classified as toxic (有毒) in the Chinese Pharmacopoeia. The primary toxic compound is ginkgotoxin (4'-O-methylpyridoxine, MPN), a neurotoxic anti-vitamin B6 substance. MPN interferes with vitamin B6 metabolism by competing with pyridoxal for pyridoxal kinase, reducing levels of pyridoxal-5'-phosphate (PLP). This in turn decreases the activity of glutamate decarboxylase in the brain, lowering GABA (an inhibitory neurotransmitter) synthesis, which can trigger seizures. Additional toxic components include ginkgolic acids (银杏酸, with cytotoxic, immunotoxic, and allergenic properties), trace cyanogenic glycosides (producing small amounts of hydrocyanic acid), and bilobol alkaloids that can act synergistically with the cyanides. The embryo (green heart) of the seed contains the highest concentration of toxic compounds. Poisoning onset is 1-12 hours after ingestion. Symptoms include nausea, vomiting, abdominal pain, diarrhea, followed by restlessness, convulsions, limb rigidity, respiratory difficulty, and in severe cases coma, respiratory failure, and death. Children are far more vulnerable: 5-10 raw seeds may poison a small child; the toxic dose in adults is roughly 40-300 seeds. Proper processing greatly reduces toxicity: the toxic compounds are water-soluble and heat-labile. Medicinal use requires removing the fleshy outer coat and embryo, soaking, then steaming or boiling before drying. Cooked Bai Guo within the standard medicinal dosage (5-10g) is considered safe under practitioner guidance. Vitamin B6 injection is used as part of modern emergency treatment for Bai Guo poisoning.

Contraindications

Situations where Bai Guo should not be used or requires extra caution

Avoid

Raw (uncooked) consumption: Bai Guo must never be eaten raw. Raw seeds contain the highest concentration of toxic compounds including ginkgotoxin (4'-O-methylpyridoxine), ginkgolic acids, and trace cyanogenic glycosides. Raw consumption has caused fatalities, particularly in children.

Avoid

Infants and children under 5 years old: Children are extremely susceptible to Bai Guo toxicity. Reports document that as few as 5-10 raw seeds can cause fatal poisoning in young children. Even cooked seeds should be avoided in very young children.

Avoid

Excessive dosage: Do not exceed the standard medicinal dosage. Overconsumption (even of cooked seeds) can cause nausea, vomiting, abdominal pain, convulsions, respiratory difficulty, and in severe cases, respiratory failure and death.

Caution

Conditions with active, thick, difficult-to-expectorate phlegm (cough with copious sticky sputum): Bai Guo is astringent and constraining by nature. Using it when thick phlegm needs to be expelled can trap the pathogen inside and worsen the condition.

Caution

Exterior patterns or acute infections in early stages (external pathogenic factors not yet resolved): The astringent nature of Bai Guo can lock pathogens inside the body, preventing their release through normal channels.

Caution

Excess-type (Shi Zheng) patterns of wheezing, vaginal discharge, or urinary frequency: Bai Guo is best suited for deficiency-type conditions. When the underlying cause is excess (such as Damp-Heat), the herb's binding action may worsen the root problem.

Caution

Known allergy to Ginkgo biloba: The outer fleshy seed coat contains high levels of ginkgolic acid, which can cause severe contact dermatitis, skin redness, swelling, itching, and blistering. Even the processed seed may trigger reactions in highly sensitive individuals.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Bai Guo should be avoided during pregnancy. Its toxic compounds (ginkgotoxin and ginkgolic acids) pose potential risks to fetal development. Ginkgotoxin interferes with vitamin B6 metabolism, which is critical during pregnancy for fetal neurological development. Additionally, its astringent and descending properties could theoretically affect uterine dynamics. No adequate safety studies exist for use during pregnancy. If a pregnant woman has been prescribed a formula containing Bai Guo, this should be carefully reviewed by a qualified practitioner who may substitute a safer alternative.

Breastfeeding

Bai Guo should be used with caution during breastfeeding, and ideally avoided unless specifically prescribed by a qualified practitioner. The toxic compound ginkgotoxin (4'-O-methylpyridoxine) is a small molecule that could potentially transfer into breast milk. Since infants are extremely sensitive to ginkgotoxin (far more so than adults), even small amounts in breast milk could pose a risk. There are no clinical studies confirming the safety of Bai Guo during lactation.

Children

Bai Guo is extremely dangerous for young children. Children under 5 years old should not be given Bai Guo in any form. For older children (over 5), if clinically necessary, the dosage should be significantly reduced (typically one-third to one-half of the adult dose, carefully calculated by a qualified practitioner). Even cooked seeds given as food should not exceed 3-5 pieces for children. The younger the child, the greater the risk of toxicity. The majority of recorded Bai Guo poisoning cases throughout Chinese medical history have involved children.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Bai Guo

Anticoagulant and antiplatelet drugs (warfarin, aspirin, clopidogrel): Although most research on Ginkgo-drug interactions pertains to Ginkgo leaf extract rather than the seed, caution is warranted. Ginkgo contains compounds (particularly ginkgolides) that can inhibit platelet-activating factor (PAF). A large Veterans Administration study found that concurrent ginkgo and warfarin use significantly increased bleeding risk (hazard ratio 1.38). However, controlled clinical trials using standardized leaf extract (EGb 761) have generally not demonstrated significant effects on hemostasis. As the evidence is mixed, concurrent use of Bai Guo with anticoagulant or antiplatelet medications should be approached cautiously, particularly in elderly patients or those with known bleeding risks.

Opioid analgesics and CNS depressants (codeine, morphine, pethidine, phenobarbital): According to Chinese Pharmacopoeia sources, Bai Guo should not be used with strong cough suppressants, opioid analgesics, or sedative-hypnotics such as barbiturates. The combination may enhance respiratory depression, compounding the risk of the seed's own potential for respiratory suppression at higher doses.

Antiepileptic medications: Because ginkgotoxin lowers GABA levels by interfering with vitamin B6-dependent glutamate decarboxylase, it could theoretically lower seizure thresholds and counteract the effects of antiepileptic drugs. Patients with epilepsy or those on seizure medications should avoid Bai Guo.

Dietary Advice

Foods and dietary considerations when taking Bai Guo

While taking Bai Guo medicinally, avoid eating additional ginkgo seeds as food (to prevent accidental overdose). Since Bai Guo is used to astringe the Lungs and stop discharge, avoid excessively cold, raw, or greasy foods that generate Phlegm-Dampness, which would work against the herb's therapeutic purpose. If taking Bai Guo for Lung conditions, warm, lightly cooked foods that support Lung function are preferable. If Bai Guo poisoning occurs, traditional remedies include decocting 30g of Gan Cao (licorice root) or 30-60g of Bai Guo shells in water as an emergency measure while seeking medical attention.

Botanical Description

Physical characteristics and morphology of the Bai Guo source plant

Ginkgo biloba L. is the sole surviving species of an ancient lineage dating back over 200 million years, often called a "living fossil." It is a tall deciduous tree that can reach 25-40 meters in height with a trunk diameter of up to 4 meters. Young trees have a conical crown that broadens with age into a wide, ovoid shape.

The leaves are distinctive fan-shaped (resembling a duck's foot, hence an old Chinese name yā jiǎo 鸭脚), pale green, with parallel forking veins and no central midrib. Leaves on young shoots may be deeply lobed. In autumn, the foliage turns a striking golden yellow before falling. The tree is dioecious (male and female flowers on separate trees). Seeds mature in autumn (September-October), are roughly oval, 2-3 cm in diameter, and enclosed in a fleshy outer seed coat that is yellow-orange when ripe and produces a strong, unpleasant odor due to butyric acid content. Beneath this is a hard, whitish bony shell (the middle seed coat), inside which lies the edible kernel.

Native to China, wild populations may persist only in the Tianmu Mountains of Zhejiang province, though it has been cultivated extensively throughout China and worldwide as an ornamental and medicinal tree. It thrives in warm, moist climates at elevations of 500-1000 meters, preferring deep, well-drained slightly acidic soils and full sun. It is remarkably resistant to disease, pollution, and pests, and individual trees can live for over a thousand years.

Sourcing & Harvesting

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

Harvesting season

Autumn (September to October), when the seeds are fully mature and the fleshy outer coat turns yellow-orange.

Primary growing regions

Major production areas include Guangxi, Sichuan, Henan, Shandong, Hubei, Jiangsu, and Liaoning provinces. Guangxi is traditionally regarded as producing the finest quality. Jiangsu province holds special significance: Taixing city was officially named "China's Ginkgo Hometown" (中国银杏之乡) in 1996, producing over a third of China's total output. Pizhou city in Jiangsu was also designated a premier ginkgo region. The Taixing "Fo Zhi" (Buddha's Finger) cultivar is one of the most prized varieties nationwide. The tree is native to China and may only survive in a truly wild state in the Tianmu Mountains of Zhejiang. It is now cultivated globally.

Quality indicators

Good quality Bai Guo seeds have a clean white to pale yellowish shell with no mold spots, cracks, or discoloration. The shell should feel solid when shaken (no rattling sound inside, which would indicate the kernel has dried out and deteriorated). When opened, the kernel (seed) should be plump and full, with a fresh yellow-green color indicating freshness. A kernel that has turned grayish-white, rough-textured, or shows black spots has deteriorated. The cross-section should show a yellowish outer gelatinous layer and a pale yellow-green starchy interior. There should be no off-odors or rancid smell. The taste of properly processed Bai Guo is mildly sweet with a slight bitterness.

Classical Texts

Key passages from the classical Chinese medical texts that describe Bai Guo and its therapeutic uses

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

Original: 「熟食温肺益气，定喘嗽，缩小便，止白浊；生食降痰，消毒杀虫。」

Translation: "Eaten cooked, it warms the Lungs and benefits Qi, calms wheezing and cough, reduces urination, and stops white turbid discharge. Eaten raw, it directs Phlegm downward, resolves toxins, and kills parasites."

《本草纲目》(Ben Cao Gang Mu) — on toxicity

Original: 「食多则收令太过，令人气壅昏顿。《三元延寿书》言昔日有饥者，同以白果代饭食饱，次日皆死也。」

Translation: "Eating too much causes excessive astringing, leading to Qi stagnation, dizziness, and stupor. The San Yuan Yan Shou Shu records that in a past famine, villagers ate their fill of Bai Guo as a meal substitute, and all died the next day."

《医学入门》(Yi Xue Ru Men)

Original: 「清肺胃浊气，化痰定喘，止咳。」

Translation: "Clears turbid Qi from the Lungs and Stomach, transforms Phlegm, calms wheezing, and stops cough."

《本草便读》(Ben Cao Bian Du)

Original: 「上敛肺金除咳逆，下行湿浊化痰涎。」

Translation: "Above, it astringes Lung Metal to stop coughing and counterflow; below, it moves Damp turbidity downward and transforms Phlegm."

《本草再新》(Ben Cao Zai Xin)

Original: 「补气养心，益肾滋阴，止咳除烦，生肌长肉，排脓拔毒，消疮疥疽瘤。」

Translation: "Tonifies Qi and nourishes the Heart, benefits the Kidneys and enriches Yin, stops cough and eliminates irritability, generates flesh and muscle, expels pus and draws out toxins, disperses sores, scabies, and abscesses."

Historical Context

The history and evolution of Bai Guo's use in Chinese medicine over the centuries

Bai Guo comes from the Ginkgo tree, one of the oldest living tree species on Earth, with fossils dating back over 200 million years. In China it is sometimes called the "grandfather-grandson tree" (公孙树, gōng sūn shù), because a person who plants a ginkgo tree will not live to see it bear fruit abundantly — it takes roughly 20 years to mature and 40 years to produce large harvests of seeds. This name captures the long generational timescale of the tree's life.

As a medicine, Bai Guo first appeared under the name "Yin Xing" (银杏, silver apricot) in the Song dynasty text Shaoxing Ben Cao (《绍兴本草》). The name "Bai Guo" (white fruit) first appeared in the late Song/early Yuan dynasty work San Yuan Can Zan Yan Shou Shu (《三元参赞延寿书》) by Li Pengfei. Li Shizhen explained the naming in the Ben Cao Gang Mu: the leaves resemble duck feet (鸭脚, yā jiǎo), so this was the original folk name; when the fruit was first sent as tribute to the Song court, it was renamed "silver apricot" (银杏) because the kernel resembled a small apricot and its shell was white like silver. The Southern Song poet Lu You wrote of serving Bai Guo to friends, showing its established culinary use by that era.

Bai Guo's dual nature as both food and poison has been recognized for centuries. The Yuan dynasty text San Yuan Yan Shou Shu recorded a mass poisoning when starving villagers ate Bai Guo as a meal replacement. This awareness led to the classical medical tradition consistently emphasizing that it must be cooked thoroughly, the green embryo removed, and consumption strictly limited.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Bai Guo

1

Review of Ginkgo biloba-induced toxicity, from experimental studies to human case reports (Review, 2019)

Mei N, Guo X, Ren Z, Kobayashi D, Wada K, Guo L. Review of Ginkgo biloba-induced toxicity, from experimental studies to human case reports. Journal of Environmental Science and Health, Part C. 2017;35(1):1-28.

A comprehensive review covering both seed and leaf toxicity of Ginkgo biloba. The paper confirms that seed poisoning is primarily caused by the neurotoxin 4'-O-methylpyridoxine (ginkgotoxin), which interferes with vitamin B6 metabolism. Most reported poisoning cases involve children. The review also discusses the NTP finding of carcinogenic activity of Ginkgo leaf extract in rodents, though the relevance to human consumption at normal doses remains debated.

PubMed
2

Toxicity of 4'-O-methylpyridoxine-5'-glucoside in Ginkgo biloba seeds (Preclinical, 2011)

Kobayashi D, Yoshimura T, Johno A, Sasaki K, Wada K. Toxicity of 4'-O-methylpyridoxine-5'-glucoside in Ginkgo biloba seeds. Food Chemistry. 2011;126(3):1198-1202.

This study examined the toxicity of both ginkgotoxin (MPN) and its glucoside form (MPNG) in mice. Both compounds showed lethal effects at 0.8 mmol/kg body weight. Importantly, the glucoside content was much higher than free MPN in heated (cooked) seeds, meaning heating alone does not fully eliminate toxicity. The total ginkgotoxin content showed no significant reduction after heating, challenging the assumption that cooking completely detoxifies the seeds.

3

Impact of Ginkgo biloba drug interactions on bleeding risk and coagulation profiles: A comprehensive analysis (Retrospective observational study, 2025)

Nguyen TP, et al. Impact of Ginkgo biloba drug interactions on bleeding risk and coagulation profiles: A comprehensive analysis. PLoS One. 2025;20(4):e0321804.

Analyzing 2,647 prescriptions involving Ginkgo biloba extract, 12.94% exhibited drug interactions, most commonly with antiplatelet agents (clopidogrel, aspirin), anticoagulants, and NSAIDs. The study emphasizes caution when prescribing Ginkgo alongside these medications and recommends monitoring coagulation parameters (APTT, PT, fibrinogen) in at-risk patients. Note: this study used Ginkgo leaf extract, not seed preparations.

PubMed
4

Potential interaction of Ginkgo biloba leaf with antiplatelet or anticoagulant drugs: What is the evidence? (Systematic review, 2008)

Bone KM. Potential interaction of Ginkgo biloba leaf with antiplatelet or anticoagulant drugs: What is the evidence? Molecular Nutrition & Food Research. 2008;52(7):764-771.

A systematic review of controlled clinical studies and case reports examining whether Ginkgo biloba potentiates anticoagulant or antiplatelet drugs. Results from controlled studies consistently indicated that standardized Ginkgo extract (EGb 761) did not significantly impact hemostasis or adversely affect the safety of co-administered aspirin or warfarin. Case reports of bleeding were generally low quality. The review concluded that safety concerns regarding drug interactions may be overstated, though idiosyncratic bleeding events cannot be completely ruled out.

PubMed

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.