Herb Fruit (果 guǒ / 果实 guǒ shí)

Luo Han Guo

Monk fruit · 罗汉果

Siraitia grosvenorii (Swingle) C. Jeffrey ex A. M. Lu et Z. Y. Zhang · Fructus Momordicae

Also known as: Buddha Fruit

Luo Han Guo (Monk fruit) plant

Images shown are for educational purposes only

Luó Hàn Guǒ (monk fruit) is a naturally sweet, cooling fruit used in Chinese medicine to soothe coughs, relieve sore throats, and restore a lost voice. It also gently moistens the intestines to ease constipation. Because its intense sweetness comes from compounds the body does not absorb as sugar, it has become widely popular as a zero-calorie natural sweetener suitable for people managing blood sugar or weight.

Category Phlegm-transforming herbs (化痰药) Heat-clearing herbs
Therapeutic focus Respiratory Health Throat and Voice Care Digestive Regularity Blood Sugar Support

TCM Properties

Temperature

Cool

Taste

Sweet (甘 gān)

Channels entered

Lungs, Large Intestine

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

Therapeutic focus

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

Respiratory Health Throat and Voice Care Digestive Regularity Blood Sugar Support

TCM Actions

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

Clears Heat and Moistens the Lungs Benefits the Throat and Restores the Voice Resolves Phlegm and Stops Cough Moistens the Intestines and Unblocks the Bowels Generates Fluids and Relieves Thirst

How these actions work

'Clears Heat and moistens the Lungs' means Luó Hàn Guǒ cools excessive warmth in the Lung system while simultaneously supplying moisture to dry, irritated lung tissue. This makes it especially suited for dry, hacking coughs caused by Lung Heat or Lung Dryness, where the throat feels parched and phlegm is either absent or sticky and hard to expectorate. Its sweet, cool nature gently nourishes Lung fluids without being overly cold or harsh on digestion.

'Benefits the throat and restores the voice' refers to its ability to soothe an inflamed, painful throat and help recover a hoarse or lost voice. When Heat scorches the throat and vocal cords, the tissues become swollen and dry. Luó Hàn Guǒ's cooling and moistening properties relieve this irritation, making it a favourite among singers, teachers, and anyone who uses their voice heavily.

'Resolves Phlegm and stops cough' means it helps transform sticky, heat-type phlegm that lodges in the airways, calming the coughing reflex. This applies to coughs with thick yellow or scanty phlegm that is difficult to bring up, not to thin watery phlegm from Cold conditions.

'Moistens the Intestines and unblocks the bowels' describes how its sweet, moistening quality lubricates the intestinal tract, helping relieve constipation caused by dryness in the bowels. This is the kind of constipation where stools are hard, dry, and difficult to pass.

'Generates fluids and relieves thirst' means it replenishes body fluids that have been consumed by Heat, addressing thirst that follows febrile illness or occurs in hot weather.

Patterns Addressed

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

Why Luo Han Guo addresses this pattern

Lung Heat produces coughing with thick, yellow phlegm, a dry sore throat, and sometimes a hoarse or lost voice. Luó Hàn Guǒ is sweet and cool, entering the Lung channel, which allows it to directly clear Heat from the Lungs while simultaneously generating fluids to counteract the drying effect of Heat on lung tissue. Its gentle moistening nature soothes the irritated mucous membranes of the throat and airways, easing the cough and restoring vocal clarity.

A practitioner would look for one or more of these signs

Hypochondrial Pain That Is Worse On Coughing And Breathing

Dry or productive cough with sticky yellow phlegm

Sore Throat

Hot, painful throat

Hoarseness

Hoarse or lost voice

Thirst

Thirst with dry mouth

Commonly Used For

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

Arises from: Lung Heat Lung Dryness

TCM Interpretation

In TCM, chronic or acute cough is most often rooted in a disruption of the Lungs' descending function. When Heat invades the Lungs (from external pathogens or internal imbalance), it scorches Lung fluids and causes the Lung Qi to rebel upward, manifesting as cough. When the Lungs are simply too dry (from seasonal dryness, chronic illness, or fluid loss), the lack of moisture irritates the airways and triggers a non-productive cough. In both cases, the Lungs cannot perform their role of spreading and descending Qi smoothly.

Why Luo Han Guo Helps

Luó Hàn Guǒ's cool temperature directly clears Heat from the Lung channel, while its sweet taste generates fluids and moistens dry tissue. This dual action addresses the root cause of both Heat-type and Dryness-type cough: it cools what is too hot, and moistens what is too dry. Its gentle action makes it suitable even for people with weaker constitutions who cannot tolerate strongly cold or bitter herbs. It can be used simply steeped in hot water as a daily tea for chronic cough, or combined with other herbs for more acute conditions.

Also commonly used for

Hoarseness

Loss of voice or hoarseness from overuse or Heat

Bronchitis

Acute and chronic bronchitis with Lung Heat

Pharyngitis

Chronic pharyngitis with dry, sore throat

Tonsillitis

Acute tonsillitis with Heat signs

Whooping Cough

Pertussis with paroxysmal cough

Diabetes

As a sugar substitute; traditional use for thirst and wasting

Herb Properties

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

Temperature

Cool

Taste

Sweet (甘 gān)

Channels Entered

Lungs Large Intestine

Parts Used

Fruit (果 guǒ / 果实 guǒ shí)

Dosage & Preparation

These are general dosage guidelines for Luo Han Guo — 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 30g in decoction for acute Lung-heat cough or severe sore throat, under practitioner guidance. For everyday use as a tea, one whole dried fruit (approximately 15-20g) per day is a typical upper limit.

Dosage notes

The standard decoction dose is 9-15g (roughly half to one whole dried fruit). For severe coughs with thick phlegm or acute sore throat, doses up to 30g may be used. When used as a simple tea infusion rather than a full decoction, one whole fruit is typically broken open and steeped in boiling water, which can be refilled 4-5 times. Because Luo Han Guo is extremely sweet (its mogrosides are approximately 300 times sweeter than sugar), the amount can be adjusted to taste. Excessive or prolonged daily use is not recommended, as the extreme sweetness may burden the Spleen and Stomach over time, potentially causing digestive sluggishness in susceptible individuals.

Preparation

Luo Han Guo does not require special decoction handling. The dried fruit is typically cracked open, broken into pieces, and either decocted in water or simply steeped in boiling water as a tea. It can also be simmered with meats (especially lean pork or pork lung) in soup for a combined food-medicine preparation. The seeds and shell are typically included when preparing the tea.

Common Herb Pairs

These ingredients are traditionally combined with Luo Han Guo for enhanced therapeutic effect

Pang Da Hai
Pang Da Hai Luó Hàn Guǒ 10g : Pàng Dà Hǎi 5g

Luó Hàn Guǒ and Pàng Dà Hǎi both clear Lung Heat and benefit the throat, but they approach it from complementary angles. Luó Hàn Guǒ moistens the Lungs and generates fluids, while Pàng Dà Hǎi opens and diffuses Lung Qi and relieves throat swelling. Together they provide a more complete treatment for sore throat, hoarseness, and voice loss from Lung Heat.

When to use: For sore throat, hoarseness, or loss of voice due to Lung Heat, especially in professional voice users like teachers and singers.

Sang Bai Pi
Sang Bai Pi 1:1

Sāng Bái Pí drains Lung Heat and calms wheezing, while Luó Hàn Guǒ moistens the Lungs and stops cough. Together they address both the excess Heat and the fluid deficiency that coexist in many Lung Heat cough patterns, preventing the draining action of Sāng Bái Pí from further drying the Lungs.

When to use: For cough with yellow phlegm, wheezing, and throat pain due to Lung Heat, such as in acute bronchitis.

Pi Pa Ye
Pi Pa Ye Luó Hàn Guǒ 15g : Pí Pá Yè 10g

Pí Pá Yè (loquat leaf) descends Lung Qi and transforms Phlegm, while Luó Hàn Guǒ clears Heat and moistens the Lungs. The combination effectively stops cough by addressing both the rebellious upward movement of Lung Qi and the underlying Heat-Dryness that irritates the airways.

When to use: For persistent cough with thick phlegm that is hard to expectorate, dry throat, and an uncomfortable feeling of Heat in the chest. This pair forms the core of several modern proprietary cough formulas.

Bai Bu
Bai Bu 1:1

Bǎi Bù moistens the Lungs and stops cough with a warming quality, while Luó Hàn Guǒ clears Heat and moistens from a cooling angle. The pairing balances warm and cool to treat cough without being excessively cold, broadening the range of cough types that can be addressed.

When to use: For chronic cough that has both Heat and deficiency components, including chronic bronchitis and lingering post-infectious cough.

Comparable Ingredients

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

Pang Da Hai
Luo Han Guo vs Pang Da Hai

Both clear Lung Heat and benefit the throat, but Luó Hàn Guǒ is more moistening and better at generating fluids, making it superior for dry cough and constipation. Pàng Dà Hǎi is stronger at opening the voice and reducing throat swelling, and is preferred when voice loss from acute swelling is the primary concern. Luó Hàn Guǒ is also much milder on the digestion and can be used longer-term as a tea, while Pàng Dà Hǎi is more strongly cooling and should not be used for extended periods.

Chuan Bei Mu
Luo Han Guo vs Chuan Bei Mu

Both moisten the Lungs and stop cough, but Chuān Bèi Mǔ is more powerful at resolving Phlegm nodules and is classified among the Phlegm-transforming herbs, while Luó Hàn Guǒ is gentler and more focused on clearing Heat, moistening dryness, and benefiting the throat. Chuān Bèi Mǔ is the first choice for Yin-deficient cough with thick phlegm, whereas Luó Hàn Guǒ is better as a simple daily beverage for dry throat, voice protection, and mild respiratory complaints.

Gua Lou
Luo Han Guo vs Gua Lou

Both moisten and clear the Lungs and also unblock the bowels, but Guā Lóu is stronger at transforming thick, sticky Hot Phlegm and opening the chest, making it more appropriate for chest tightness with difficult-to-expectorate phlegm. Luó Hàn Guǒ is milder, sweeter, more focused on the throat, and better suited as a food-grade daily tonic for dry respiratory conditions.

Identity & Adulterants

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

The dried fruit of Melodinus suaveolens (山橙), a plant from the Apocynaceae (dogbane) family, has been documented as a fraudulent substitute for Luo Han Guo on the market. Unlike genuine Luo Han Guo, Melodinus suaveolens fruit is toxic and lacks the sweet mogrosides. The authentic fruit can be distinguished by its characteristic sweet taste when steeped in water, its yellow-brown spongy pulp with flat seeds, and its thin brittle shell. The adulterant fruit lacks the distinctive sweetness and has different internal morphology. Additionally, small, deformed, or immature fruits are sometimes marketed as "wild Luo Han Guo" at premium prices. Virtually all commercial Luo Han Guo is cultivated, and genuine wild fruit is extremely rare, so claims of wild sourcing should be treated with skepticism.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Luo Han Guo

Non-toxic

Luo Han Guo is classified as non-toxic in TCM literature and is recognized as a medicine-food dual-use substance by the Chinese government. Its main sweet-tasting compounds, the mogrosides (triterpene glycosides), have been granted GRAS (Generally Recognized As Safe) status by the US FDA. A 90-day gavage toxicity study in dogs found no significant adverse effects at doses up to 3000 mg/kg body weight per day of mogroside extract. Mogroside V was found to be non-mutagenic in bacterial reverse mutation assays and did not induce chromosomal damage in vitro. One EFSA evaluation noted possible testicular effects in a 90-day rat study at high doses of concentrated mogroside extract, but no parental, reproductive, or developmental toxicity was observed in screening studies. At standard dietary and medicinal doses, Luo Han Guo has no known toxic effects.

Contraindications

Situations where Luo Han Guo should not be used or requires extra caution

Caution

Spleen and Stomach deficiency cold (脾胃虚寒): Luo Han Guo is cool in nature and very sweet, which can further weaken a cold, deficient digestive system, potentially worsening loose stools, bloating, or poor appetite.

Caution

Wind-cold cough or cold-type cough with thin white phlegm: Because Luo Han Guo clears Lung heat and is cool in nature, it is not appropriate for coughs caused by external cold or internal cold patterns, which require warming methods instead.

Caution

Chronic diarrhea or loose stools: The moistening, bowel-lubricating action of Luo Han Guo may worsen diarrhea in those with pre-existing Spleen deficiency or intestinal weakness.

Caution

Nocturnal enuresis (bedwetting) or seminal emission (遗精、夜尿): Classical sources caution against use in these conditions, as the sweet, moistening nature may aggravate fluid-related dysfunction.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Generally considered safe at standard doses. Luo Han Guo is a food-grade substance with no known teratogenic or uterine-stimulating effects. One reproductive screening study in rats found no maternal or developmental toxicity. Chinese popular sources generally consider it acceptable for pregnant women to consume in moderate amounts, as it provides hydration and mild relief for throat dryness. However, its cool nature means that women with cold-constitution pregnancies or significant Spleen deficiency should use it sparingly. As always, pregnant women should consult a healthcare provider before using any herbal substance regularly.

Breastfeeding

No specific concerns have been documented regarding Luo Han Guo use during breastfeeding. As a food-grade, non-toxic substance with GRAS status for its primary sweet compounds, it is generally considered compatible with breastfeeding at standard dietary doses. Its mogrosides are poorly absorbed systemically and unlikely to transfer significantly into breast milk. The cool nature of the herb could theoretically affect the mother's digestion if used excessively, so moderation is advisable, especially for mothers or infants with digestive sensitivity.

Children

Luo Han Guo is generally considered safe for children due to its food-grade status and non-toxic classification. It is commonly used in southern China as a household remedy for children's coughs and sore throats, typically prepared as a tea. Dosage should be reduced proportionally based on the child's age and weight, typically using one-quarter to one-half of the adult dose. For young children, half a fruit or less steeped in water is a common approach. Because of its cool nature, it should be used with caution in children with weak digestion or a tendency to loose stools, and should not be given long-term as a daily beverage.

Drug Interactions

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

No well-documented clinically significant drug interactions have been established for Luo Han Guo at standard dietary or medicinal doses. Its mogrosides have been shown to have hypoglycaemic effects in animal models, so theoretically there could be an additive blood-sugar-lowering effect when combined with insulin or oral hypoglycaemic medications. Individuals taking diabetes medications should monitor blood glucose levels when using Luo Han Guo regularly and consult their healthcare provider. No interactions with anticoagulants, antihypertensives, or other common drug classes have been reported in the literature.

Dietary Advice

Foods and dietary considerations when taking Luo Han Guo

When taking Luo Han Guo for Lung-heat cough or sore throat, it is best to avoid spicy, fried, or greasy foods that can generate more internal heat and counteract its cooling, moistening action. Cold, raw foods should be limited for individuals with weak digestion who are using Luo Han Guo, as its cool nature combined with cold foods may further burden the Spleen. Luo Han Guo pairs well with lean pork, pear, chrysanthemum, and Pang Da Hai (Sterculia seed) for enhanced throat-soothing effects.

Botanical Description

Physical characteristics and morphology of the Luo Han Guo source plant

Siraitia grosvenorii (Swingle) C. Jeffrey is a herbaceous perennial climbing vine belonging to the Cucurbitaceae (gourd) family. The vine grows 2 to 5 metres long, climbing over supporting structures by means of tendrils. The stems, branches, and leaf stalks are covered with yellow-brown soft hairs and dark glandular scales. The leaves are membranous, heart-shaped (ovate-cordate), and approximately 10 to 20 cm long. The plant is dioecious (male and female flowers on separate plants), with yellow flowers bearing black glandular dots. Flowering occurs from May to August, with fruiting from August to October.

The medicinal fruit is round or oblong, about 6 to 8 cm long and 4 to 6.5 cm in diameter. When fresh, the fruit is green, turning brownish-yellow to dark brown when dried. The thin, brittle skin encloses a spongy, pale yellowish-brown pulp with flat seeds. The plant thrives in subtropical mountainous environments at elevations of 200 to 800 metres, preferring shaded hillsides, forest margins, river valleys, and moist thickets with high humidity and frequent mist cover.

Sourcing & Harvesting

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

Harvesting season

Autumn (September to October), when the fruit matures and the skin changes from bright green to deep green. After harvest, fruits are left to post-ripen for 8 to 10 days until the skin turns yellow, then dried at low temperature.

Primary growing regions

The premier production region (道地药材) for Luo Han Guo is Guangxi Province in southern China, particularly the mountainous areas near Guilin. Yongfu County is recognized as the original homeland and primary production base, earning the title "Home of Chinese Luo Han Guo." Together with neighboring Lingui County and Longsheng County, these areas account for approximately 90% of global production. The unique microclimate of this region features subtropical temperatures, high humidity, frequent mountain mists, significant day-night temperature differences, and rich selenium-containing soils, all contributing to superior fruit quality. Smaller amounts are also grown in Guangdong, Hunan, Guizhou, and Jiangxi provinces.

Quality indicators

Good quality Luo Han Guo fruit is large, round or oval, intact without cracks or charring, and has a uniform yellow-brown to brownish-yellow surface colour covered with fine yellowish hairs (more hairs indicate fresher fruit). When shaken, a quality fruit should not rattle, as rattling indicates the inner pulp has detached from the shell due to insufficient maturity. When lightly tossed on a table, it should bounce like a ping-pong ball with a crisp sound. The shell should feel dry, firm, and slightly elastic rather than soft or sticky. When broken open, the inner pulp should be a pale yellowish colour with a spongy, intact texture, sweet aroma, and clean sweet taste without bitterness. Avoid fruits that are charred, have black spots, rattle when shaken, have a white or grey pulp interior, feel heavy for their size (indicating moisture or spoilage), or emit musty or off odours.

Classical Texts

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

Because Luo Han Guo was historically a regional folk remedy of Guangxi rather than a mainstream item in the classical herbal tradition, its earliest recorded references come from Qing dynasty and Republican-era local gazetteers rather than the major classical materia medica texts:

  • 《修仁县志》(Xiuren County Gazetteer, Qing Dynasty, ~1830)
    「罗汉果可以入药，清热治嗽，其果每生必十八颗相连，因以为名。」
    "Luo Han Guo can be used as medicine, clearing heat and treating cough. Its fruits always grow in clusters of eighteen, and it is named for this reason."
  • 《临桂县志》(Lingui County Gazetteer, Qing Dynasty, ~1905)
    「罗汉果大如柿，椭圆中空，味甜性凉，治劳嗽。」
    "Luo Han Guo is as large as a persimmon, oval and hollow inside, sweet in taste and cool in nature, treating consumptive cough."
  • 《岭南采药录》(Records of Collecting Herbs in Lingnan)
    「理痰火咳嗽，和猪精肉煎汤服之。」
    "It treats cough from phlegm-fire. Decoct it in soup with lean pork and take it."
  • 《广西中药志》(Guangxi Materia Medica)
    「止咳清热，凉血润肠。治咳嗽，血燥胃热便秘等。」
    "Stops cough, clears heat, cools the blood, and moistens the intestines. Treats cough, blood dryness, stomach heat, constipation, and similar conditions."

Historical Context

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

Luo Han Guo is unusual among Chinese medicinal substances because it entered the herbal tradition relatively late. Unlike most major Chinese herbs documented in ancient texts spanning thousands of years, Luo Han Guo was a folk remedy used by the Yao ethnic minority people in the mountains of northern Guangxi. Its earliest written mention dates to around 1813 in local Guangxi gazetteers. It was not included in the Chinese Pharmacopoeia until 1977, and in 1987 it was officially classified by the Chinese Ministry of Health as one of the first "medicine-food dual use" (药食两用) substances.

The name "Luo Han Guo" (罗汉果) literally means "Arhat Fruit," referring to the Buddhist concept of an enlightened being. One popular folk explanation is that the fruit grows in clusters resembling the Eighteen Arhats (十八罗汉). Another local legend tells of a Yao herbalist named Luo Han who discovered the fruit's medicinal value for treating coughs and was commemorated in its name. The scientific species name grosvenorii honours Gilbert Hovey Grosvenor, president of the National Geographic Society, who funded a 1930s expedition that collected the plant in China. Song dynasty poet Zhu Xi reportedly wrote a poem referencing monks brewing Luo Han Guo tea, suggesting early recognition of the fruit's use in monastic settings.

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Luo Han Guo

1

Comprehensive Review of S. grosvenorii: Chemical Composition, Pharmacology, Toxicology (Review, 2024)

Wang H, et al. Frontiers in Pharmacology, 2024, Volume 15, Article 1388747.

A thorough review documenting that Siraitia grosvenorii contains triterpenoid saponins (mogrosides), flavonoids, amino acids, volatile oils, polysaccharides, and vitamins. The review summarized broad pharmacological activities including antioxidant, hypoglycaemic, immunomodulatory, antitussive and expectorant, hepatoprotective, and antimicrobial effects from both in vitro and in vivo studies.

Link
2

Subchronic 90-day Oral Toxicity Study of a Luo Han Guo Mogroside Extract in Dogs (Animal study, 2006)

Qin X, Xiaojian S, Ronggan L, et al. Food and Chemical Toxicology, 2006, 44(12), 2106-2109.

A combined 28-day and 90-day oral toxicity study in dogs found no significant adverse effects on clinical observations, body weight, blood chemistry, organ weight, or histopathology at 3000 mg/kg/day of mogroside extract. The no-observed-adverse-effect level (NOAEL) was established at 3000 mg/kg/day.

PubMed
3

EFSA Scientific Opinion: Safety of Use of Monk Fruit Extract as a Food Additive (Regulatory review, 2019)

Younes M, Aquilina G, Engel KH, et al. EFSA Journal, 2019, 17(12), e05921.

The European Food Safety Authority reviewed the safety of monk fruit extract for use as a food additive. The extract was found negative in bacterial mutagenicity tests and did not induce chromosomal damage. However, the panel noted that the overall toxicity database was insufficient for a complete safety conclusion, particularly regarding potential testicular effects observed in a rat study and the lack of long-term chronic/carcinogenicity data.

PubMed
4

The Fruits of Siraitia grosvenorii: A Review of a Chinese Food-Medicine (Review, 2019)

Li C, Lin LM, Sui F, et al. Chinese Medicine, 2019, 14, 46.

A comprehensive ethnopharmacological review documenting S. grosvenorii's 300-year traditional use as an antitussive and expectorant. Phytochemical studies identified triterpenoids, flavonoids, and amino acids as key constituents. Pharmacological evidence supported antioxidant, hypoglycaemic, immunological, hepatoprotective, and antimicrobial activities.

Link
5

Mogroside V: A Review of Its Structure, Synthesis, Pharmacokinetics, and Toxicity (Review, 2025)

Wang Y. Archiv der Pharmazie, 2025, 358, e112.

A comprehensive review of mogroside V covering its anti-inflammatory, antioxidant, anticancer, and neuroprotective effects. The compound was found to scavenge intracellular reactive oxygen species, support mitochondrial function, and modulate glucose and lipid metabolism through the AMPK signalling pathway. It also showed promising efficacy in alleviating pneumonia in preclinical models.

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.