Herb Fruit (果 guǒ / 果实 guǒ shí)

Xiang Yuan

Citron fruit · 香橼

Citrus medica L. / Citrus wilsonii Tanaka · Fructus Citri

Also known as: Gou Yuan (枸橼), Xiang Yuan Gan (香橼柑)

Xiang Yuan (Citron fruit) plant

Images shown are for educational purposes only

Citron fruit is a gentle, aromatic herb used to ease digestive discomfort such as bloating, belching, nausea, and stomach pain caused by stress or emotional tension. It also helps loosen chest congestion and clear phlegm from the lungs. Because it works by moving stuck Qi and calming the digestive system, it is especially suited for people whose digestive problems worsen with stress or frustration.

Category Qi-regulating herbs (理气药)
Therapeutic focus Digestive Health Stress-related digestive issues Respiratory Health Emotional Wellbeing

TCM Properties

Temperature

Warm

Taste

Acrid / Pungent (辛 xīn), Bitter (苦 kǔ), Sour (酸 suān)

Channels entered

Liver, Spleen, Lungs

Parts used

Fruit (果 guǒ / 果实 guǒ shí)

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What This Herb Does

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

Therapeutic focus

In practical terms, Xiang Yuan is primarily used to support these areas of health:

Digestive Health Stress-related digestive issues Respiratory Health Emotional Wellbeing

TCM Actions

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

Courses the Liver and Resolves Constraint Regulates Qi and Harmonizes the Middle Burner Dries Dampness and Transforms Phlegm Regulates Qi and Broadens the Middle Burner

How these actions work

'Soothes the Liver and resolves depression' means Xiāng Yuán helps restore the smooth flow of Qi through the Liver system. When someone is emotionally frustrated, stressed, or irritable, the Liver's Qi can become stuck or "knotted." This shows up as pain or tightness along the sides of the ribcage, a feeling of a lump in the throat, or mood swings. Xiāng Yuán's pungent taste disperses this stuck Qi while its bitter taste helps push it downward and outward, relieving the congestion. It is commonly paired with herbs like Yù Jīn (Curcuma tuber), Fó Shǒu (finger citron), and Xiāng Fù (Cyperus tuber) for this purpose.

'Regulates Qi and harmonizes the Middle' means it restores the normal movement of Qi in the Spleen and Stomach (the digestive center or "Middle Burner"). When Qi stagnates here, people experience bloating, belching, acid reflux, nausea, loss of appetite, or epigastric pain. Xiāng Yuán's aromatic fragrance "wakes up" the Spleen, and its pungent-bitter nature moves stagnant Qi and promotes the Stomach's natural downward-moving function. It is combined with herbs like Mù Xiāng (Costus root), Shā Rén (Amomum), and Chén Pí (Tangerine peel) to strengthen this effect.

'Dries Dampness and transforms Phlegm' means Xiāng Yuán helps the body break down and clear accumulated Phlegm, particularly in the Lungs and chest. When Qi stagnation and Dampness combine, thick mucus can build up, causing coughing with copious sputum and a heavy, congested feeling in the chest. The herb's bitter taste dries Dampness and its warm nature helps dispel cold Phlegm. It is often used with Bàn Xià (Pinellia) and Fú Líng (Poria) for this indication.

Patterns Addressed

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

Why Xiang Yuan addresses this pattern

Xiāng Yuán directly addresses Liver Qi Stagnation through its pungent, dispersing nature and its affinity for the Liver channel. When the Liver's Qi becomes stuck (often due to emotional stress or frustration), it fails to flow smoothly, causing pain and distension in the chest and ribcage area. Xiāng Yuán's pungent taste scatters the bound-up Qi while its bitter taste promotes the Liver's natural spreading and draining function. Its warm temperature gently activates Qi movement without being overly drying. Although it is milder than some other Qi-moving herbs, its aromatic quality makes it particularly suited for patterns where the stagnation causes a stuffy, oppressive sensation in the chest.

A practitioner would look for one or more of these signs

Rib Pain

Distending pain along the sides of the ribs (胁肋胀痛)

Chest Stiffness

Stifling sensation in the chest

Irritability

Emotional irritability and frustration

Frequent Bleeding

Frequent sighing or desire to take deep breaths

Commonly Used For

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

Arises from: Qi Stagnation Liver Qi Stagnation

TCM Interpretation

TCM understands chronic gastritis primarily as a disorder of the Spleen and Stomach's Qi movement. The Stomach's Qi should descend (to move food downward), while the Spleen's Qi should ascend (to transport nutrients upward). When this coordinated movement breaks down, food stagnates, producing bloating, fullness, belching, and pain. A very common trigger is emotional stress, which causes the Liver's Qi to stagnate and then "invade" the Stomach (a pattern called Liver overacting on the Stomach), disrupting digestion further. Over time, this Qi stagnation can generate Dampness and Phlegm, creating a more complex picture with nausea, thick tongue coating, and a heavy sensation in the abdomen.

Why Xiang Yuan Helps

Xiāng Yuán is well suited for chronic gastritis because it simultaneously addresses both the Liver and the Stomach. Its pungent, aromatic quality "wakes up" sluggish digestion and disperses stagnant Qi in the Stomach, directly relieving the core symptoms of bloating and fullness. At the same time, its action on the Liver channel helps smooth out the emotional-digestive connection, preventing stress from further disrupting the Stomach. Clinical studies in China have reported that formulas containing Xiāng Yuán show high effectiveness rates for superficial gastritis when combined with other herbs. Its Phlegm-resolving action also helps when gastritis is complicated by nausea or a thick, greasy tongue coating indicating Dampness.

Also commonly used for

Acid Reflux

When caused by Liver-Stomach disharmony and Qi stagnation

Nausea

Due to stagnant Qi in the Middle Burner

Chronic Bronchitis

Cough with copious phlegm and chest congestion

Indigestion

Poor digestion with bloating, especially stress-related

Intercostal Neuralgia

Rib-area pain from Liver Qi stagnation

Hiccups

Due to rebellious Stomach Qi

Loss Of Appetite

From Spleen-Stomach Qi stagnation

Herb Properties

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

Temperature

Warm

Taste

Acrid / Pungent (辛 xīn), Bitter (苦 kǔ), Sour (酸 suān)

Channels Entered

Liver Spleen Lungs

Parts Used

Fruit (果 guǒ / 果实 guǒ shí)

Dosage & Preparation

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

Standard dosage

3-10g

Maximum dosage

Up to 10g in standard decoction. This is a mild herb and higher doses are rarely needed or used.

Dosage notes

Use the lower range (3-6g) for mild Qi stagnation with a focus on regulating Liver Qi. Use the higher range (6-10g) when phlegm is the primary concern and the formula requires stronger phlegm-resolving action. Aged specimens (陈香橼) are traditionally preferred over fresh ones for their enhanced therapeutic potency, particularly for cough and Qi congestion. The Ben Cao Tong Xuan warns that using Xiang Yuan alone or in large amounts can damage the body's Qi, so it is best combined with Qi-tonifying herbs (such as Ren Shen or Bai Zhu) when treating patients with underlying deficiency.

Preparation

No special decoction handling is required. Xiang Yuan is simply added to the decoction pot with other herbs and decocted normally. When preparing from whole dried fruit, the pulp and seeds should be removed before use to avoid excessive sourness. Sliced and bran-fried (麸炒) forms are commonly available and may be preferred for their milder effect on the Stomach.

Processing Methods

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

Processing method

Dry-fry the clean Xiāng Yuán slices over gentle heat until slightly scorched or yellowed, then remove and cool.

How it changes properties

Stir-frying moderates the herb's sour and pungent dispersing properties, making it less drying and less likely to consume Qi. The acrid dispersing action becomes gentler. The warming nature remains but is slightly tempered.

When to use this form

Preferred when the patient has mild Qi or Yin deficiency alongside Qi stagnation, or when the raw herb's dispersing nature is too strong for the clinical situation.

Common Herb Pairs

These ingredients are traditionally combined with Xiang Yuan for enhanced therapeutic effect

Fo Shou
Fo Shou 1:1 (e.g. Xiāng Yuán 6g : Fó Shǒu 6g)

Xiāng Yuán and Fó Shǒu are closely related herbs from the same plant family with overlapping but complementary strengths. Used together (xiāng xū, mutually reinforcing), they powerfully soothe Liver Qi, harmonize the Stomach, and transform Phlegm. Fó Shǒu is stronger at relieving pain and stopping nausea/vomiting, while Xiāng Yuán is better at resolving Phlegm in the Lungs. The pair together provides broad Qi-regulating coverage across the Liver, Stomach, and Lungs.

When to use: Use when Liver Qi stagnation is causing both digestive symptoms (epigastric pain, nausea, belching) and chest congestion with Phlegm, or when a single Qi-regulating herb is insufficient.

Chen Pi
Chen Pi 1:1 (e.g. Xiāng Yuán 6g : Chén Pí 6g)

Xiāng Yuán and Chén Pí together strengthen the effects of regulating Qi and transforming Phlegm. Xiāng Yuán focuses on soothing Liver Qi and resolving Phlegm in the Lungs, while Chén Pí is stronger at drying Dampness and regulating Spleen-Stomach Qi. Together they address Qi stagnation across the Liver, Spleen, Stomach, and Lungs while effectively resolving Damp-Phlegm.

When to use: Use for combined Liver-Stomach Qi stagnation with Damp-Phlegm, presenting as bloating, cough with sputum, and chest congestion.

Ban Xia
Ban Xia 1:1.5 (e.g. Xiāng Yuán 6g : Bàn Xià 9g)

Xiāng Yuán regulates Qi and opens the chest while Bàn Xià powerfully dries Dampness and transforms Phlegm. Xiāng Yuán addresses the Qi stagnation component that breeds Phlegm, while Bàn Xià directly dissolves the Phlegm itself and descends rebellious Stomach Qi. Together they treat both the cause (Qi stagnation) and the result (Phlegm accumulation).

When to use: Use for Phlegm-Dampness cough with copious sputum, chest congestion, and nausea, especially when Qi stagnation underlies the Phlegm production.

Sha Ren
Sha Ren 2:1 (e.g. Xiāng Yuán 6g : Shā Rén 3g)

Xiāng Yuán soothes Liver Qi and moves stagnation in the Middle Burner, while Shā Rén aromatically transforms Dampness, warms the Middle, and stops diarrhea. Together they powerfully resolve Qi stagnation and Dampness in the Spleen and Stomach, addressing bloating, nausea, and poor appetite from multiple angles.

When to use: Use for Spleen-Stomach Qi stagnation complicated by Dampness, with symptoms like severe bloating, loss of appetite, nausea, and loose stools.

Comparable Ingredients

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

Fo Shou
Xiang Yuan vs Fo Shou

Fó Shǒu and Xiāng Yuán are the most commonly compared pair because they come from closely related citrus species and share very similar properties (both warm, pungent-bitter, entering the Liver, Spleen, and Lungs). However, Fó Shǒu is stronger overall: it is more aromatic, better at relieving pain, and more effective at harmonizing the Stomach to stop nausea and vomiting. Xiāng Yuán is milder in its Qi-moving action but has a stronger effect on transforming Phlegm and regulating Lung Qi. When choosing between them, Fó Shǒu is preferred for digestive symptoms with pain and vomiting, while Xiāng Yuán is preferred when Phlegm and cough are prominent.

Chen Pi
Xiang Yuan vs Chen Pi

Both Chén Pí and Xiāng Yuán regulate Qi and transform Phlegm, but they differ in scope and strength. Chén Pí is warmer, more potent at drying Dampness in the Spleen, and is one of the most versatile and widely used Qi-regulating herbs in all of Chinese medicine. Xiāng Yuán is milder and more specifically targets Liver Qi stagnation alongside its Spleen and Lung effects. Chén Pí is the better choice for straightforward Spleen-Stomach Dampness and Phlegm, while Xiāng Yuán is chosen when Liver Qi stagnation is a significant factor in the clinical picture.

Zhi Ke
Xiang Yuan vs Zhi Ke

Both Zhǐ Ké (bitter orange peel) and Xiāng Yuán regulate Qi and relieve distension. Zhǐ Ké is more powerful at breaking up Qi stagnation and is better for severe abdominal or chest fullness and distension. Xiāng Yuán is gentler and adds the specific benefit of soothing Liver Qi and resolving Phlegm. For patients with mild Qi stagnation who also have emotional components and Phlegm, Xiāng Yuán is preferred; for stronger Qi stagnation with pronounced distension, Zhǐ Ké is more effective.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Xiang Yuan

Xiang Yuan is most commonly confused with its close relative Fo Shou (佛手, Buddha's hand, Citrus medica var. sarcodactylis). Both have very similar properties and are sometimes used interchangeably, but Fo Shou is generally considered stronger in Qi-moving action and more focused on the Liver and Stomach, while Xiang Yuan is milder and better at resolving phlegm. Fo Shou has distinctive finger-like projections in its fruit shape that make it easy to distinguish from the round or oval citron. The two official source species themselves are distinct: Citrus medica (枸橼) produces larger, oval, thick-rinded slices, while Citrus wilsonii (香圆) produces smaller, rounder, harder fruits with thinner rinds. The latter is actually the more common commercial product. In some regions, immature fruits of Xiang Yuan have reportedly been substituted for Zhi Shi (枳实) or Zhi Qiao (枳壳), which come from entirely different citrus species.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Xiang Yuan

Non-toxic

Xiang Yuan is classified as non-toxic in the Chinese Pharmacopoeia and in classical texts such as the Yin Shan Zheng Yao, which described it as "non-toxic" (无毒). It contains no known toxic alkaloids or harmful compounds. The main active constituents are volatile oils (d-limonene, citral), flavonoids (hesperidin), organic acids (citric acid, malic acid), and vitamin C. No special processing is required to render it safe, though the pulp and seeds are traditionally removed before use to avoid excessive sourness that could have a constraining effect on Qi.

Contraindications

Situations where Xiang Yuan should not be used or requires extra caution

Caution

Yin deficiency with internal Heat or Blood dryness. As noted in the Ben Cao Bian Du, Xiang Yuan is aromatic and drying in nature, and people with Yin deficiency and Blood dryness should avoid it.

Caution

Qi deficiency without stagnation. The Ben Cao Tong Xuan cautions that Xiang Yuan, when used alone or in large amounts, can deplete the body's Qi. It should be combined with tonifying herbs like Ren Shen or Bai Zhu when Qi deficiency is present.

Caution

Pregnancy with Qi deficiency. As a Qi-moving herb, it should be used cautiously in pregnant women who are Qi-deficient, as excessive Qi movement may disturb the fetus.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use with caution during pregnancy, particularly in women with Qi deficiency. Xiang Yuan is a Qi-regulating (Qi-moving) herb, and excessive Qi movement can theoretically disturb the fetus. Classical texts specifically caution that pregnant women who are Qi-deficient (孕妇气虚者) should avoid this herb. At standard doses in women without Qi deficiency, the risk is considered low, but practitioner guidance is recommended.

Breastfeeding

No specific contraindication is documented for breastfeeding. Xiang Yuan is a mild, non-toxic Qi-regulating herb with no known components that pose a risk through breast milk. However, its aromatic and drying nature could theoretically affect breast milk production in women prone to Yin or fluid deficiency. Standard doses are generally considered acceptable, but practitioner guidance is recommended.

Children

No specific pediatric dosage is documented in classical texts. For children, dosage should be reduced proportionally based on age and body weight, typically one-third to one-half of the adult dose. The herb is mild and non-toxic, making it generally suitable for pediatric use when Qi stagnation and phlegm are present. However, due to its aromatic and drying nature, it should be used with caution in children with signs of fluid depletion or Yin deficiency.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Xiang Yuan

No well-documented drug interactions specific to Xiang Yuan have been established in clinical literature. However, as a member of the Citrus medica species, it contains furanocoumarins (such as bergapten) that are found across the citrus family. While grapefruit is the most clinically significant citrus for drug interactions (inhibiting CYP3A4 enzymes), the furanocoumarin content in citron is considerably lower and clinically significant interactions have not been demonstrated. Nevertheless, theoretical caution is warranted when combining Xiang Yuan with medications that have a narrow therapeutic window and are metabolized by cytochrome P450 enzymes (e.g. certain statins, calcium channel blockers, immunosuppressants). Patients taking such medications should consult their healthcare provider.

Dietary Advice

Foods and dietary considerations when taking Xiang Yuan

While taking Xiang Yuan for Qi stagnation or phlegm conditions, avoid cold and raw foods that could further impair Spleen function and generate more Dampness or phlegm. Greasy, heavy, and rich foods should also be minimized, as they can worsen the Qi stagnation and phlegm accumulation that Xiang Yuan is intended to treat. Light, warm, easily digestible foods are recommended.

Botanical Description

Physical characteristics and morphology of the Xiang Yuan source plant

Xiang Yuan is the dried mature fruit of two closely related species in the Rutaceae (citrus) family: the citron (Citrus medica L.) and the fragrant round citrus (Citrus wilsonii Tanaka).

The citron (C. medica) is a slow-growing evergreen shrub or small tree reaching 2 to 4.5 metres tall, with stiff, irregular branches bearing sharp spines in the leaf axils. Young branches and buds are purplish. The leaves are leathery, elliptic to ovate-elliptic (8 to 15 cm long), lemon-scented, with serrate margins and short, wingless petioles. Flowers appear in short racemes of 3 to 10, with 5 fleshy white petals that are purplish on the outside, and 30 to 50 stamens. The fruit is large and fragrant, oblong or oval, reaching up to 25 cm in length, with a remarkably thick, bumpy, yellow rind. The pulp is pale yellow, divided into 12 to 16 segments, very acidic, and contains numerous seeds.

The fragrant round citrus (C. wilsonii) is a taller evergreen tree (4 to 6 m), with smooth, nearly spineless branches and broadly winged petioles. Its round fruit is smaller (4 to 7 cm), with a very rough, orange-yellow surface when ripe. It is distributed mainly in Jiangsu, Zhejiang, and other provinces along the Yangtze River.

Sourcing & Harvesting

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

Harvesting season

Autumn (September to November), when the fruit is fully mature.

Primary growing regions

Citron (Citrus medica): Mainly produced in Yunnan, Guangxi, and Sichuan provinces in southwestern China. Yunnan is particularly associated with high-quality citron and is a traditional area of cultivation favoured by the Naxi people of Lijiang. Fragrant round citrus (Citrus wilsonii): Mainly produced in Jiangsu and Zhejiang provinces in eastern China, where commercial supply is actually larger and more widely used than the citron form. The plant is believed to have originated in the Himalayan region of India and northeastern India, later spreading to China, the Mediterranean, and other subtropical regions.

Quality indicators

Two forms exist in commerce, each with distinct quality markers: Citron (枸橼, Citrus medica): Slices are round or oblong, 4-10 cm in diameter and 0.2-0.5 cm thick. The outer peel should be yellow or yellow-green with visible sunken oil glands. The mesocarp (middle rind) is thick (1-3 cm), yellowish-white, with irregular, raised vascular bundles forming a net-like pattern. The pulp sections number 10-17. Good quality pieces are pliable (not brittle), with a strong, clean citrus fragrance and a slightly sweet, bitter-pungent taste. Fragrant round citrus (香圆, Citrus wilsonii): Whole or half-sphere, 4-7 cm diameter. Surface is dark green or yellow-brown with densely sunken oil glands and coarse, raised wrinkles. Very hard texture. Cross-section shows a thin mesocarp (about 0.5 cm) and 9-11 pulp segments that are brownish or pale red-brown. Aroma is fragrant; taste is sour and bitter. For both types, aged specimens (陈香橼) are traditionally preferred for stronger therapeutic effect. Avoid pieces that are moldy, insect-damaged, or have lost their aroma.

Classical Texts

Key passages from the classical Chinese medical texts that describe Xiang Yuan and its therapeutic uses

Ben Cao Shi Yi (《本草拾遗》)

Chinese: 去气，除心头痰水。

English: "Dispels Qi [stagnation] and eliminates phlegm-fluid from the chest."

Yin Shan Zheng Yao (《饮膳正要》)

Chinese: 下气，开胸膈。

English: "Directs Qi downward and opens the chest and diaphragm."

Ben Cao Tong Xuan (《本草通玄》)

Chinese: 理上焦之气，止呕逆，进食，健脾。

English: "Regulates the Qi of the upper burner, stops vomiting and rebellious Qi, promotes appetite, and strengthens the Spleen."

Ben Cao Tong Xuan (《本草通玄》)

Chinese: 香圆性中和，单用多用亦损正气，与参、术同行则无弊也。

English: "Xiang Yuan is moderate in nature, but used alone or excessively it can damage the body's Qi. When combined with Ren Shen and Bai Zhu, this problem is avoided."

Ben Jing Feng Yuan (《本经逢原》)

Chinese: 柑橼乃佛手、香橼两种，性味相类，故《纲目》混论不分。盖柑者佛手也，橼者香橼也，兼破痰水，近世治咳嗽气壅，亦取陈者。除去瓤核用之，庶无酸收之患。

English: "The term 'citron' encompasses both Fo Shou [Buddha's hand] and Xiang Yuan [citron]. Their properties and flavours are similar, which is why the Ben Cao Gang Mu discusses them without distinction. Both can break up phlegm and fluid. In recent practice, aged specimens are preferred for treating cough and Qi congestion. The pulp and seeds should be removed to avoid the constraining effects of sourness."

Ben Cao Bian Du (《本草便读》)

Chinese: 香圆皮，下气消痰，宽中快膈。虽无橘皮之温，而究属香燥之品，阴虚血燥之人仍当禁用耳。

English: "The peel of Xiang Yuan directs Qi downward, resolves phlegm, and opens the middle burner and diaphragm. Although it is not as warming as tangerine peel, it is still aromatic and drying in nature, so it should still be avoided by those with Yin deficiency and Blood dryness."

Historical Context

The history and evolution of Xiang Yuan's use in Chinese medicine over the centuries

Xiang Yuan has a long and somewhat confusing history in Chinese materia medica, largely because classical texts often used the same terms for several closely related citrus fruits. The name "citron" (枸橼, gou yuan) originally referred to Citrus medica, but historical texts frequently conflated it with the closely related Buddha's hand (佛手, Fo Shou), which is actually a variety of the same species (C. medica var. sarcodactylis). As the Ben Jing Feng Yuan noted, Li Shizhen's Ben Cao Gang Mu discussed the two without distinction because their properties are so similar.

The herb first appears in the Tang dynasty text Ben Cao Shi Yi, where its ability to resolve Qi stagnation and dispel phlegm was already recognized. By the Ming and Qing dynasties, scholars began to distinguish citron from Buddha's hand more carefully. The modern Chinese Pharmacopoeia lists two official source species: the citron proper (C. medica) and the fragrant round citrus (C. wilsonii), which is the more widely produced commercial source today. Clinically, practitioners have long preferred aged specimens (陈香橼, chen xiang yuan) for stronger therapeutic effect, and classical formulas often specify the aged form.

Beyond medicine, citron has deep cultural significance in China. Its intense fragrance made it a favourite ornamental fruit for display on desks and in study rooms. The Yunnan Naxi people traditionally cultivated it both for food (as candied preserves) and for its aroma as a natural room freshener.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Xiang Yuan

1

Systematic Review on Phytochemical Profile and Biological Activities of Citrus medica (2023)

Benedetto N, Carlucci V, Faraone I, Lela L, Ponticelli M, Russo D, Mangieri C, Tzvetkov NT, Milella L. Plants (Basel). 2023; 12(12): 2267.

This systematic review compiled evidence from PubMed and Scopus databases on the chemical composition and biological properties of Citrus medica. The authors found that the plant contains abundant flavonoids (hesperidin, naringin, quercetin), coumarins, terpenes (limonene), and phenolic acids. Research has demonstrated antioxidant, anti-inflammatory, antimicrobial, antidiabetic, anticancer, and neuroprotective activities, though most evidence comes from in vitro and animal studies.

2

In Vitro Activities of Citrus medica cv. Diamante Relevant to Treatment of Diabetes and Alzheimer's Disease (2007)

Conforti F, Statti GA, Tundis R, Loizzo MR, Menichini F. Phytotherapy Research. 2007; 21(5): 427-433.

This laboratory study examined extracts of the Diamante citron variety and found relevant biological activities, including antioxidant effects and enzyme inhibition relevant to diabetes (alpha-amylase, alpha-glucosidase) and Alzheimer's disease (acetylcholinesterase). Results were preliminary and in vitro only.

3

Anti-inflammatory Effect of Essential Oil from Fingered Citron through Blocking JNK, ERK and NF-κB Signaling Pathways (2013)

Choi SY, et al. Food and Chemical Toxicology. 2013; 57: 126-131.

This preclinical study analyzed essential oil from the peel of fingered citron (Citrus medica var. sarcodactylis), finding that its main constituents limonene (52%) and gamma-terpinene (28%) significantly inhibited inflammatory mediators (NO, PGE2, TNF-alpha, IL-1beta, IL-6) in macrophage cells by suppressing NF-κB activation. This supports the traditional use of citron-family fruits for conditions involving inflammation.

PubMed
4

Citrus medica: Nutritional, Phytochemical Composition and Health Benefits — A Review (2018)

Chhikara N, Kour R, Jaglan S, Gupta P, Gat Y, Panghal A. Food & Function. 2018; 9: 1978-1992.

This comprehensive review summarized the nutritional value and phytochemistry of Citrus medica, covering its rich content of vitamin C, pectin, hesperidin, limonene, and various phenolic acids. The review discussed evidence for antioxidant, antimicrobial, anti-inflammatory, and potential antidiabetic properties, providing a broad overview of the plant's health-related applications.

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.