Herb Fruit (果 guǒ / 果实 guǒ shí)

Gou Qi Zi

Goji berry · 枸杞子

Lycium barbarum L. · Fructus Lycii

Also known as: Wolfberry, Chinese wolfberry, Lycium fruit,

Gou Qi Zi (Goji berry) plant

Images shown are for educational purposes only

Goji berry is one of the most popular herbs in Chinese medicine, prized for nourishing the Liver and Kidneys, supporting healthy vision, and promoting vitality. It is mild and gentle enough for everyday use and is commonly added to teas, soups, and porridges. People often turn to it for tired or dry eyes, lower back soreness, fatigue, and general anti-aging support.

Category Yin-tonifying herbs (补阴药) Tonifying herbs (补虚药)
Therapeutic focus Eye Health and Vision Kidney Health Healthy Aging Fertility Immune Support

TCM Properties

Temperature

Neutral

Taste

Sweet (甘 gān)

Channels entered

Liver, Kidneys, Lungs

Parts used

Fruit (果 guǒ / 果实 guǒ shí)

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

Therapeutic focus

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

Eye Health and Vision Kidney Health Healthy Aging Fertility Immune Support

TCM Actions

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

Nourishes Liver and Kidney Yin Benefits Essence and Fills the Marrow Brightens the Eyes Nourishes Lung Yin Nourishes Blood

How these actions work

'Nourishes and tonifies the Liver and Kidneys' refers to Gou Qi Zi's core ability to replenish the Yin and Blood of the Liver and Kidneys. These two organ systems share a common root in TCM ('Liver and Kidney share the same source'), and when their Yin is depleted, a person may experience lower back soreness, weak knees, dizziness, tinnitus, premature greying, or sexual dysfunction such as impotence or nocturnal emissions. Because Gou Qi Zi is neutral in temperature and sweet in taste, it gently nourishes without being too hot or too cold, making it suitable for long-term use. It is one of the few tonic herbs that can support both Yin and Yang to some degree, though its Yin-nourishing action predominates.

'Benefits Essence (Jing)' means this herb helps replenish the body's fundamental reserve substance, which governs growth, reproduction, and aging. This is why Gou Qi Zi appears in many formulas for male and female fertility, premature aging, and general constitutional weakness. Classical texts describe it as helping the body 'generate essence and fill the marrow.'

'Brightens the eyes' is one of the best-known actions of Gou Qi Zi. In TCM, the Liver 'opens into the eyes,' and the Kidneys provide the deep nourishment (Essence) that supports vision. When Liver Blood or Kidney Essence is insufficient, blurred vision, dry eyes, diminished visual acuity, or night blindness may result. Gou Qi Zi addresses the root cause by nourishing both Liver and Kidney. It is very commonly paired with chrysanthemum flower (Ju Hua) for this purpose.

'Enriches Yin and moistens the Lungs' means Gou Qi Zi can address dry, unproductive cough caused by Lung Yin deficiency. This is a secondary action but clinically relevant, especially in chronic conditions where the Kidneys fail to send moisture upward to the Lungs.

'Nourishes Blood' describes the herb's ability to supplement the Blood, particularly Liver Blood, which helps address a sallow complexion, dizziness, and pale lips associated with Blood deficiency.

Patterns Addressed

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

Why Gou Qi Zi addresses this pattern

Gou Qi Zi directly nourishes the Yin of both the Liver and Kidneys, which share a common root. Its sweet taste tonifies and its neutral temperature means it can replenish depleted Yin without generating unwanted Heat or Cold. When Liver and Kidney Yin are deficient, the body loses its moistening, cooling, and anchoring capacity, leading to dizziness, blurred vision, tinnitus, and lower back weakness. By entering the Liver and Kidney channels and enriching Yin and Essence, Gou Qi Zi addresses the core deficiency that drives this pattern.

A practitioner would look for one or more of these signs

Blurry Vision

From Liver Blood and Kidney Essence failing to nourish the eyes

Dizziness

Chronic, mild dizziness from Yin deficiency

Tinnitus

Low-pitched buzzing or ringing from Kidney Yin depletion

Lower Back Pain

Dull, chronic soreness of the lumbar region

Premature Greying Of Hair

Essence and Blood unable to nourish the hair

Commonly Used For

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

Arises from: Heart and Kidney Yin Deficiency Liver Blood Deficiency

TCM Interpretation

In TCM, the eyes are the sensory opening of the Liver. Healthy vision depends on the Liver receiving adequate Blood and the Kidneys providing deep Essence to sustain the eyes' 'spirit-light.' When Liver Blood or Kidney Yin becomes depleted through aging, chronic screen use, overwork, or prolonged illness, the eyes lose their nourishment and become dry, tired, or blurry. This is not primarily understood as a local tear-film problem but as a systemic deficiency of the nourishing substances that reach the eyes through the Liver channel.

Why Gou Qi Zi Helps

Gou Qi Zi directly enters the Liver and Kidney channels to replenish Yin and Blood. By restoring these nourishing substances at their source, it helps the body deliver adequate moisture and nutrition to the eyes. Its action of 'brightening the eyes' is one of its most celebrated functions, documented since the earliest classical texts. Modern research confirms that goji berries are rich in zeaxanthin, a carotenoid concentrated in the retina that supports eye health. In practice, Gou Qi Zi is frequently paired with Ju Hua (chrysanthemum) to enhance the eye-nourishing effect.

Also commonly used for

Dizziness

Chronic dizziness from Liver-Kidney Yin deficiency

Lower Back Pain

Dull, chronic lumbar ache from Kidney deficiency

Impotence

From Kidney Essence deficiency

Infertility

Male or female, related to Jing depletion

Tinnitus

Chronic, low-grade tinnitus from Kidney Yin deficiency

Premature Greying Of Hair

Essence and Blood failing to nourish hair

Night Sweats

From Yin deficiency with deficiency Heat

Dry Cough

Chronic dry cough from Lung Yin depletion

Chronic Fatigue Syndrome

General constitutional weakness and low vitality

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

Liver Kidneys Lungs

Parts Used

Fruit (果 guǒ / 果实 guǒ shí)

Dosage & Preparation

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

Standard dosage

6-12g

Maximum dosage

Up to 15-20g in decoction for therapeutic purposes. When used as a food supplement (chewed or in porridge), moderate daily amounts of 10-15g are common and well-tolerated. Doses significantly exceeding the pharmacopoeia range (especially in concentrated juice or wine form) should be avoided, particularly by patients on anticoagulant therapy.

Dosage notes

Standard decoction dose of 6-12g is appropriate for most therapeutic purposes including nourishing Liver and Kidney Yin, brightening the eyes, and tonifying Blood. When used primarily for eye health (paired with Ju Hua/chrysanthemum), 6-10g is typical. For more pronounced Kidney Essence and Blood deficiency, doses toward the upper range (10-15g) may be used. As a daily health food (chewed directly, added to porridge, or steeped in tea), 10-15 berries (approximately 5-10g) is a common maintenance amount. The herb can also be soaked in wine for tonic preparations, though the enhanced extraction may increase its potency and potential for drug interactions. Decoction is the standard method, but direct consumption (chewing) is very common since the herb is a recognised food item.

Preparation

No special decoction handling required. Gou Qi Zi is simply added to the decoction and boiled with the other herbs. It is also very commonly consumed directly (chewed) or added to congee, soups, and teas without decoction. When making tea, it can be steeped in hot water. Prolonged high-temperature boiling may degrade some heat-sensitive nutrients (such as carotenoids), so when the goal is nutritional supplementation rather than traditional decoction, brief steeping or direct consumption is preferred.

Processing Methods

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

Processing method

Dry-fried until slightly darkened and fragrant.

How it changes properties

The temperature shifts from neutral to slightly warm, making the herb easier to digest and less likely to cause loose stools. The moistening quality is slightly reduced, decreasing the risk of stagnation in people with weak digestion.

When to use this form

For patients with weak Spleen and Stomach function who need Liver-Kidney tonification but tend toward loose stools or bloating when taking the raw herb.

Common Herb Pairs

These ingredients are traditionally combined with Gou Qi Zi for enhanced therapeutic effect

Ju Hua
Ju Hua 1:1 (e.g. Gou Qi Zi 10g : Ju Hua 10g)

Gou Qi Zi nourishes Liver and Kidney Yin from below while Ju Hua (chrysanthemum) clears Liver Heat and disperses Wind from above. Together they address both the root (Yin deficiency) and the branch (rising Heat affecting the eyes), creating a synergy for brightening the eyes and clearing vision that neither herb achieves as effectively alone. This is one of the oldest and most celebrated herb pairs in the tradition.

When to use: Blurred vision, dry eyes, diminished visual acuity, photophobia, or eyes tearing in the wind, all due to Liver and Kidney Yin deficiency. Also useful for dizziness and headache from Liver Yang rising on a background of Yin deficiency.

Shu Di Huang
Shu Di Huang 1:2 (e.g. Gou Qi Zi 12g : Shu Di Huang 24g)

Both herbs nourish Liver and Kidney Yin, but Shu Di Huang (prepared Rehmannia) is a heavier, more potent Yin and Blood tonic, while Gou Qi Zi is lighter and also benefits Essence and brightens the eyes. Combined, their Yin-tonifying power is significantly enhanced without being excessively cloying, as Gou Qi Zi's milder nature balances Shu Di Huang's heavy richness.

When to use: Severe Liver-Kidney Yin deficiency with lower back soreness, dizziness, tinnitus, premature greying, or Blood deficiency. Forms the core of many classical formulas like Zuo Gui Wan and Qi Ju Di Huang Wan.

Tu Si Zi
Tu Si Zi 1:1 (e.g. Gou Qi Zi 12g : Tu Si Zi 12g)

Gou Qi Zi primarily nourishes Yin, while Tu Si Zi (Cuscuta seed) gently tonifies both Kidney Yin and Yang while securing Essence. Together they provide a balanced replenishment of Kidney Yin and Yang, benefitting Essence and addressing reproductive deficiency more effectively than either alone. Both are neutral in temperature, making this a gentle and well-tolerated pair.

When to use: Kidney deficiency affecting fertility, impotence, spermatorrhea, or lower back weakness. A foundational pair in formulas like Wu Zi Yan Zong Wan (Five-Seed Progeny Pill).

Huang Jing
Huang Jing 1:1 (e.g. Gou Qi Zi 12g : Huang Jing 12g)

Gou Qi Zi focuses on Liver-Kidney Yin and Essence, while Huang Jing (Polygonatum) tonifies Qi through the Spleen and Lungs and also nourishes Kidney Yin. Together they replenish both Qi and Yin simultaneously, addressing the interdependence of these vital substances. This pair is historically noted for promoting longevity and vitality.

When to use: General debility with both Qi and Yin deficiency, chronic fatigue, premature aging, or consumptive conditions. A classic longevity pairing from the Daoist tradition.

Key Formulas

These well-known formulas feature Gou Qi Zi in a prominent role

Qi Ju Di Huang Wan 杞菊地黄丸 King

This is the definitive formula showcasing Gou Qi Zi's eye-brightening action. Gou Qi Zi serves alongside Ju Hua as the defining additions to the Liu Wei Di Huang Wan base, directly targeting Liver-Kidney Yin deficiency manifesting as visual problems, dizziness, and photophobia. It remains one of the most widely prescribed eye formulas in TCM.

Wu Zi Yan Zong Wan 五子衍宗丸 King

Known as the 'foremost formula for fertility,' Wu Zi Yan Zong Wan uses Gou Qi Zi as the largest ingredient by weight. This formula highlights its Essence-benefitting action, combining five seed or fruit herbs to address male infertility, impotence, and spermatorrhea from Kidney deficiency.

Zuo Gui Wan 左歸丸 Deputy

In Zhang Jing-Yue's signature Yin-replenishing formula from the Jing Yue Quan Shu, Gou Qi Zi (12g) serves as Deputy alongside Shan Zhu Yu and Shan Yao, supporting the King herb Shu Di Huang in nourishing Liver-Kidney Yin and Essence. This formula highlights Gou Qi Zi's role as a core Yin and Essence tonic.

You Gui Wan 右歸丸 Assistant

Also from Zhang Jing-Yue's Jing Yue Quan Shu, this Yang-warming formula includes Gou Qi Zi to nourish Yin within a primarily Yang-tonifying context. This demonstrates the principle of 'seeking Yin within Yang' and showcases Gou Qi Zi's versatility as a balanced tonic that can support both Yin and Yang formulas.

Comparable Ingredients

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

Nu Zhen Zi
Gou Qi Zi vs Nu Zhen Zi

Both nourish Liver and Kidney Yin. However, Nu Zhen Zi (Ligustrum fruit) is cool in temperature and better at clearing deficiency Heat, making it more suitable when Yin deficiency produces noticeable Heat signs like hot flashes, night sweats, or a red tongue. Gou Qi Zi is neutral and also benefits Essence and brightens the eyes more strongly. For straightforward Yin deficiency without much Heat, Gou Qi Zi is the gentler, more versatile choice.

Tu Si Zi
Gou Qi Zi vs Tu Si Zi

Both are neutral and tonify the Kidneys. However, Tu Si Zi is stronger at tonifying Kidney Yang and securing Essence (for spermatorrhea, frequent urination), while Gou Qi Zi is stronger at nourishing Yin, Blood, and brightening the eyes. Tu Si Zi is preferred when Yang deficiency and Essence leakage predominate; Gou Qi Zi is preferred when Yin depletion and visual problems are the primary concern. They are frequently combined together.

Sang Shen
Gou Qi Zi vs Sang Shen

Both are sweet fruits that nourish Yin and Blood. Sang Shen (Mulberry fruit) is slightly cold and is better at generating fluids and moistening dryness, especially for constipation due to Blood or Yin deficiency in the elderly. Gou Qi Zi is neutral and more focused on the Liver and Kidney channels, with a stronger action for brightening the eyes and benefitting Essence. For visual problems and Kidney Essence deficiency, Gou Qi Zi is the clear choice.

Common Substitutes & Adulterants

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

The main adulterant concern is non-Ningxia origin berries being sold as Ningxia goji. Since Ningxia production accounts for less than 15% of China's total output, many berries from Qinghai, Gansu, Xinjiang, and Inner Mongolia are repackaged as 'Ningxia goji' at the Zhongning trading market. These are the same species (Lycium barbarum) but may differ in chemical profile. A historical substitute is the fruit of Lycium chinense (northern wolfberry or 'bitter goji'), which tends to be smaller, more elliptical or spherical, with thinner flesh, and a more bitter taste. It is not included in the current Chinese Pharmacopoeia as the official source. Sulfur-fumigated berries are a significant quality concern. These appear unnaturally bright red, have a pungent chemical smell, and taste sour-astringent rather than sweet. Alum-soaked berries feel abnormally hard and crystalline on the surface and have a distinct astringent taste of white alum. Both practices are now declining due to modern hot-air drying technology but still occasionally occur.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Gou Qi Zi

Non-toxic

Gou Qi Zi is classified as non-toxic in the Chinese Pharmacopoeia and has a very high safety margin. Animal studies determined an LD50 of approximately 83.2 g/kg for the water-soluble extract by injection in mice, indicating extremely low acute toxicity. Its betaine component has an LD50 of approximately 18 g/kg in mice. At normal dietary and decoction doses (6-12g), no toxic effects are expected. However, due to its high sugar content, excessive consumption can produce mild upper digestive discomfort or a sensation of internal Heat (perceived as 'getting hot'). No special processing is required for safe use.

Contraindications

Situations where Gou Qi Zi should not be used or requires extra caution

Caution

Active external pathogenic invasion with excess Heat (exterior syndrome with fever). Gou Qi Zi is a tonifying herb and should not be used during acute illness with fever or inflammatory conditions, as nourishing herbs can trap the pathogen inside the body.

Caution

Spleen deficiency with Dampness causing loose stools or diarrhea. Classical sources warn that the herb's moist, nourishing nature can worsen digestive weakness and cause further loose stools. As the Ben Cao Jing Shu states, one should first treat the Spleen and Stomach before using Gou Qi Zi.

Caution

Spleen and Stomach accumulation of cold Phlegm (cold-type digestive stagnation). The Ben Cao Hui Yan specifically cautions against use in patients with cold Phlegm in the digestive system.

Avoid

Concurrent use with warfarin or other anticoagulant medications. Multiple case reports document that Gou Qi Zi (especially in juice or wine form, or in doses exceeding the standard 6-12g range) can significantly potentiate warfarin's anticoagulant effect, leading to dangerously elevated INR values and bleeding.

Caution

Kidney failure or significantly impaired renal function. Gou Qi Zi has a high potassium content, and excessive intake may pose risks for individuals who cannot properly regulate potassium levels.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Generally considered safe at standard dietary and decoction doses during pregnancy. Gou Qi Zi is a gentle tonifying herb with no known uterine-stimulating, abortifacient, or teratogenic properties. It is included in some classical formulas used during pregnancy for nourishing Liver and Kidney Yin. However, as with any herb during pregnancy, it should be used under guidance from a qualified practitioner and in moderate doses. Excessive consumption may generate internal Heat due to its high sugar content.

Breastfeeding

Gou Qi Zi is generally considered safe during breastfeeding at standard doses. It is a common food-grade herb in China regularly consumed by nursing mothers as part of postpartum dietary therapy. There are no known adverse effects on lactation or transfer of harmful substances through breast milk. Its nourishing properties (tonifying Liver Blood and Kidney Essence) are traditionally considered beneficial during the postpartum period. Use at standard food or decoction doses.

Children

Gou Qi Zi is generally suitable for children in appropriately reduced doses, given its mild nature and food-grade safety status. Dosage should be reduced proportionally by age and body weight. For young children (under 6), a few berries daily (2-5g) as food is common practice in China. As a medicinal herb in decoction, children's doses typically range from 3-6g. There are no specific age contraindications, though use in very young infants should be avoided without professional guidance.

Drug Interactions

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

Warfarin and other anticoagulants: Multiple published case reports document a clinically significant interaction between Gou Qi Zi and warfarin. Patients have presented with markedly elevated INR values and bleeding episodes (nosebleeds, bruising, rectal bleeding) after consuming goji berry tea, juice, or wine while on stable warfarin doses. The proposed mechanism involves inhibition of cytochrome P450 enzymes (particularly CYP2C9) involved in warfarin metabolism. Patients taking warfarin or other vitamin K antagonists should avoid Gou Qi Zi, or if they wish to use it, should do so only under close medical supervision with frequent INR monitoring.

Hypoglycaemic medications: Animal and preliminary human studies suggest Gou Qi Zi may lower blood glucose levels. Patients on insulin or oral hypoglycaemic agents (such as metformin or sulfonylureas) should monitor blood sugar more closely when consuming significant amounts of goji berries, as additive effects could increase the risk of hypoglycaemia.

Antihypertensive medications: Although the clinical evidence is limited, some research suggests goji berries may have mild blood pressure-lowering effects. Patients on antihypertensive drugs should be aware of potential additive hypotensive effects.

Dietary Advice

Foods and dietary considerations when taking Gou Qi Zi

Gou Qi Zi is a warming, nourishing herb best supported by a diet that includes other Blood- and Yin-nourishing foods such as dark leafy greens, black sesame, walnuts, and bone broth. Avoid excessive cold, raw foods when taking Gou Qi Zi for Kidney and Liver tonification, as these can impair the Spleen's ability to absorb the herb's benefits. Limit greasy, heavy foods that produce Dampness, particularly if using the herb to address digestive weakness alongside deficiency. Avoid excessive alcohol, which generates Heat and may counteract the herb's gentle nourishing properties (though small amounts of medicinal wine with goji are a traditional preparation).

Botanical Description

Physical characteristics and morphology of the Gou Qi Zi source plant

Lycium barbarum L. is a perennial deciduous shrub belonging to the Solanaceae (nightshade) family. It typically grows 1 to 3 metres tall, with slender, arching, and sometimes thorny branches. The leaves are small, lance-shaped, and light green. In summer, the plant produces small, funnel-shaped purple or lavender flowers. The fruits are bright red to orange-red ellipsoid berries, measuring 1 to 2 cm in length, with a distinctive sweet and slightly tangy flavour. The plant thrives in arid and semi-arid environments with well-drained, slightly alkaline soils and full sunlight. It is highly drought-tolerant and naturally suited to the continental climates of northwestern China.

The medicinal part is the dried mature fruit, harvested when fully red-ripe. Each berry contains 20 to 50 small, kidney-shaped, yellowish seeds. The plant is now widely cultivated across China and has also been introduced to cultivation in parts of Central Asia, the Mediterranean, and North America.

Sourcing & Harvesting

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

Harvesting season

Summer to autumn (June through October), harvested in multiple batches as the berries ripen to bright red. The first harvest ('head crop') is generally considered the highest quality.

Primary growing regions

The classic terroir region (dao di yao cai) for Gou Qi Zi is Ningxia province, China, with Zhongning County (中宁县) as the core production area. Zhongning's unique combination of large day-night temperature differences, alkaline sandy soil, and irrigation from the Yellow River mixed with mineral-rich Qingshui River water produces berries of superior quality. Ningxia has cultivated Gou Qi Zi for over 500 years and remains the only region recognised by China's National Medical Products Administration as the official medicinal source. Other major production regions include Qinghai (particularly the Qaidam Basin/Nuomuhong area), Gansu, Xinjiang, Inner Mongolia, and Hebei. While these regions produce large volumes, Ningxia-sourced berries from the Zhongning core area are traditionally considered the highest quality for medicinal use, with higher polysaccharide and protein content.

Quality indicators

Good quality Gou Qi Zi berries are spindle-shaped (like a small date pit), 6-20mm long and 3-10mm in diameter. They should be red to dark red in colour with a slight natural lustre. The skin should be soft, pliable, and wrinkled but not brittle or overly sticky. The flesh should be thick and fleshy with relatively few seeds. Top-grade Ningxia berries are notably loose and non-clumping when handled (a distinguishing feature from other regional varieties, which tend to stick together). The taste should be distinctly sweet with a very mild sour note and no bitterness. Avoid berries that are overly bright or unnaturally red (may indicate sulfur fumigation), have a pungent sulfurous smell, or taste sour and astringent (signs of sulfur processing or alum soaking). Berries that feel hard and crystalline on the surface or poke the hand when gripped may have been soaked in alum solution. Quality Ningxia berries, when placed in water, will float initially due to their low density.

Classical Texts

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

Shen Nong Ben Cao Jing (《神农本草经》)

Chinese: 主五内邪气，热中消渴，周痹风湿，久服坚筋骨，轻身不老，耐寒暑。

English: It governs evil Qi of the five internal organs, Heat with thirst, widespread painful obstruction and wind-dampness. Long-term use strengthens the sinews and bones, makes the body light, prevents aging, and improves tolerance of cold and heat.

Ben Cao Gang Mu (《本草纲目》, Li Shizhen)

Chinese: 枸杞子甘平而润，性滋而补……此乃平补之药，所谓精不足者，补之以味也。

English: Gou Qi Zi is sweet, neutral, and moistening; its nature is nourishing and supplementing. It is a gentle tonifying herb. As the saying goes, 'when Essence is insufficient, supplement it with rich flavour.'

Ben Cao Jing Shu (《本草经疏》)

Chinese: 枸杞子，润而滋补，兼能退热，而专于补肾、润肺、生津、益气，为肝肾真阴不足、劳乏内热补益之要药。

English: Gou Qi Zi is moistening and nourishing, and can also clear deficiency Heat. It specialises in tonifying the Kidneys, moistening the Lungs, generating fluids, and boosting Qi. It is an essential herb for treating true Yin deficiency of the Liver and Kidneys, exhaustion, and internal Heat.

Ben Cao Hui Yan (《本草汇言》)

Chinese: 殊不知枸杞能使气可充，血可补，阳可生，阴可长，火可降，风湿可去，有十全之妙用焉。

English: What people do not realise is that Gou Qi Zi can replenish Qi, nourish Blood, generate Yang, grow Yin, reduce Fire, and dispel wind-dampness. It truly has ten-fold marvellous uses.

Historical Context

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

Gou Qi Zi has one of the longest documented histories of any Chinese herb. The character 杞 (qǐ) may appear in oracle bone inscriptions from the Shang Dynasty, and the plant is mentioned in the Shi Jing (Book of Songs, 11th-6th century BCE) with the verse '陟彼北山，言采其杞' ('Climb the north mountain to pick goji'). It was first formally recorded as a medicinal substance in the Shen Nong Ben Cao Jing, where it was listed as a 'superior grade' (上品) herb, meaning it was considered safe for long-term use and beneficial for prolonging life.

The herb acquired the poetic alias 却老子 (què lǎo zǐ, 'the seed that wards off old age') due to its famed longevity-promoting properties. Li Shizhen's Ben Cao Gang Mu records that all four parts of the plant were used medicinally across the seasons: leaves (天精草) in spring, flowers (长生草) in summer, berries (枸杞子) in autumn, and root bark (地骨皮) in winter. An old proverb warns '离家千里，勿食枸杞' ('when a thousand miles from home, do not eat goji berries'), an allusion to its reputed ability to enhance libido. Li Shizhen himself noted that the herb was declared the preeminent medicinal source from Ningxia: '全国入药杞子，皆宁产也' ('All goji berries used for medicine throughout the nation come from Ningxia').

From the Tang Dynasty onwards, Gansu-Ningxia gradually became recognised as the premium production area, with the sweet 'Ganzhou goji' (甘州枸杞) displacing the bitter northern varieties. By the Ming-Qing period, Zhongning had established large-scale cultivation and its berries were tribute items sent to the imperial court. Gou Qi Zi was included in the first edition of the modern Chinese Pharmacopoeia in 1963 and has appeared in every subsequent edition. Today it is one of China's most recognised medicinal food items, holding official 'drug-food dual use' (药食同源) status.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Gou Qi Zi

1

Literature Overview of Meta-Analyses on Health Effects of Goji Berries (2024)

Antonelli M, Donelli D. Medicina Internazionale. 2024; 40(1):1.

This overview examined five meta-analyses covering 4 to 10 clinical trials each. Goji berry consumption showed favourable effects on blood lipid profiles (raising HDL cholesterol by approximately 10-15 mg/dL), reducing fasting glucose by around 6-7 mg/dL, reducing oxidative stress markers, and improving subjective quality of life. No significant effects were found on body weight or blood pressure.

Link
2

Systematic Review and Meta-Analysis of Lycium barbarum Supplementation on Lipid Profiles (2023)

Published in Medicine (Baltimore). 2023; 102(40):e35444.

A meta-analysis of 5 randomised controlled trials involving 259 participants found that Lycium barbarum supplementation significantly decreased triglyceride concentrations and increased HDL cholesterol. No significant reduction in LDL cholesterol was observed. The authors concluded that dried goji berries as part of a healthy diet may benefit cardiovascular lipid management, though the limited number of studies warrants further research.

PubMed
3

Probable Interaction Between Lycium barbarum (Goji) and Warfarin — Case Report (2012)

Rivera CA, Ferro CL, Bursua AJ, Gerber BS. Pharmacotherapy. 2012; 32(3):e50-e53.

A case report of a 71-year-old woman on warfarin who developed a markedly elevated INR (prothrombin time over 120 seconds) with epistaxis, bruising, and rectal bleeding after 4 days of drinking goji juice. The Naranjo adverse drug reaction scale scored a 'probable' interaction (score of 6). This was the third published case of goji-warfarin interaction, highlighting the need for patients on anticoagulants to be cautioned about goji consumption.

Link
4

Bleeding Due to a Probable Interaction Between Warfarin and Gouqizi (2017)

Published in Toxicology Reports. 2017; 4:298-300.

A case report of a 65-year-old Chinese man on warfarin maintenance who experienced elevated INR with bleeding after drinking goji berry wine. A small prospective observation on 3 patients given standard-dose (6g/day) goji tea for 3 days found only minimal INR changes, suggesting the interaction may be dose-dependent. The authors concluded that large doses exceeding the standard 6-12g pharmacopoeia range can significantly enhance warfarin's anticoagulant effect.

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.