Herb Rhizome (根茎 gēn jīng)

She Gan

Blackberry lily rhizome · 射干

Iris domestica (L.) Goldblatt & Mabb. (syn. Belamcanda chinensis (L.) DC.) · Rhizoma Belamcandae

Also known as: Belamcanda rhizome, Leopard lily rhizome, Wu Shan (乌扇),

She Gan (Blackberry lily rhizome) plant

Images shown are for educational purposes only

She Gan (blackberry lily rhizome) is a cooling herb best known for treating sore throat, cough, and wheezing. It works by clearing heat and inflammation from the throat and lungs while helping to break down phlegm that causes breathing difficulties. It has been used in Chinese medicine for over two thousand years, first recorded in the Shen Nong Ben Cao Jing.

Category Herbs that clear Heat and resolve Toxicity (清热解毒药)
Therapeutic focus Throat Health Respiratory Health Cough and Phlegm Relief Immune Support

TCM Properties

Temperature

Cold

Taste

Bitter (苦 kǔ)

Channels entered

Lungs

Parts used

Rhizome (根茎 gēn jīng)

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What This Herb Does

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

Therapeutic focus

In practical terms, She Gan is primarily used to support these areas of health:

Throat Health Respiratory Health Cough and Phlegm Relief Immune Support

TCM Actions

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

Clears Heat and Resolves Toxicity Expels Phlegm Benefits the Throat Descends Lung Qi and Stops Cough Disperses Accumulations and Dissipates Nodules

How these actions work

'Clears Heat and resolves toxins' means She Gan has a cooling effect that helps the body deal with inflammatory, hot conditions, particularly those affecting the throat and lungs. This is the primary reason it has been considered an essential herb for sore throat since ancient times. Its bitter, cold nature directly counters Heat and toxins that cause swelling and pain in the throat.

'Eliminates Phlegm' refers to the herb's ability to break down thick, sticky mucus that obstructs the airways. She Gan is especially known for dissolving stubborn Phlegm that collects in the lungs and throat. Its bitter flavour has a naturally descending and drying quality that helps move Phlegm downward and out of the body.

'Benefits the throat' is the action She Gan is most famous for. It reduces swelling, eases pain, and restores the voice in conditions ranging from acute sore throat and tonsillitis to chronic hoarseness. Classical texts regarded it as the go-to herb whenever the throat was swollen and obstructed.

'Descends Lung Qi' means She Gan redirects the flow of Qi in the lungs downward when it has become rebellious (flowing upward), which is what causes coughing and wheezing. By lowering Lung Qi and clearing Phlegm simultaneously, it addresses the root mechanism behind many types of cough and asthma.

Patterns Addressed

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

Why She Gan addresses this pattern

She Gan is bitter and cold, entering the Lung channel directly. In Phlegm-Heat patterns, Heat condenses fluids into thick, yellow Phlegm that obstructs the airways and throat. She Gan's cold nature clears the Lung Heat, while its bitter flavour descends rebellious Lung Qi and dissolves accumulated Phlegm. This dual action of clearing Heat and eliminating Phlegm makes it particularly well suited for this pattern, where both pathogenic Heat and Phlegm are present simultaneously.

A practitioner would look for one or more of these signs

Sore Throat

Swollen, painful throat with Heat toxin

Hypochondrial Pain That Is Worse On Coughing And Breathing

Cough with thick yellow phlegm

Wheezing

Wheezing with phlegm rattling in the throat

Hoarseness

Hoarse or lost voice

Commonly Used For

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

Arises from: Toxic Heat in the Throat Phlegm-Heat in the Lungs

TCM Interpretation

In TCM, most acute sore throats are understood as Heat or Fire toxins attacking the throat, which is governed by the Lung channel. External pathogenic factors like Wind-Heat can invade the Lung and lodge in the throat, causing redness, swelling, and pain. In more severe cases, intense toxic Heat accumulates locally, leading to what classical texts call 'throat obstruction' (喉痹). The throat is a gateway of the Lung, so anything that affects the Lung channel can manifest there. When Phlegm and Heat combine, the condition becomes more stubborn, with thick mucus adding to the obstruction.

Why She Gan Helps

She Gan is historically regarded as one of the most important herbs for throat conditions. Its bitter, cold nature directly clears the Heat toxins causing the inflammation and swelling. Because it enters the Lung channel, it targets the throat precisely. The Shen Nong Ben Cao Jing, the earliest Chinese herbal classic, specifically lists it for 'throat obstruction and throat pain.' The Ben Cao Gang Mu later called it the 'essential herb for treating throat obstruction.' Its descending quality helps open the airway when swelling threatens to block it, and its toxin-resolving action reduces the infection and inflammation driving the pain.

Also commonly used for

Tonsillitis

Acute tonsillitis with swelling and pain

Pharyngitis

Acute and chronic pharyngitis

Bronchitis

Acute and chronic bronchitis with cough and phlegm

Hoarseness

Loss of voice or hoarseness from throat inflammation

Hypochondrial Pain That Is Worse On Coughing And Breathing

Cough with rebellious Lung Qi and phlegm accumulation

Lumps

Mumps (parotitis) with swelling

Pneumonia

Pneumonia with phlegm-heat

Herb Properties

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

Temperature

Cold

Taste

Bitter (苦 kǔ)

Channels Entered

Lungs

Parts Used

Rhizome (根茎 gēn jīng)

Dosage & Preparation

These are general dosage guidelines for She Gan — 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 15g in acute, severe throat obstruction with phlegm-heat, under practitioner supervision. Do not exceed 10g for routine use.

Dosage notes

Use lower doses (3–6g) when combining She Gan with other bitter, cold herbs in a formula to avoid excessive cold damage to the Spleen and Stomach. Higher doses (6–10g) are appropriate for acute sore throat with significant phlegm-heat. When using She Gan for its phlegm-resolving and antitussive actions (as in She Gan Ma Huang Tang), the standard dose is around 9g. Fresh rhizome juice, pressed and taken directly or gargled, was a classical method for acute throat emergencies but should only be done under professional guidance.

Preparation

No special decoction handling required. She Gan is sliced and decocted normally with other herbs. Traditional processing involves soaking the rhizome in rice-washing water overnight, then simmering with bamboo leaves (from noon to late evening) before drying, though modern pharmacy typically just slices and dries the cleaned rhizome.

Common Herb Pairs

These ingredients are traditionally combined with She Gan for enhanced therapeutic effect

Ma Huang
Ma Huang She Gan 9g : Ma Huang 12g

She Gan descends Lung Qi and dissolves Phlegm from within, while Ma Huang opens the Lung and disperses Cold from the exterior. Together they create a powerful one-two approach: Ma Huang opens the airways from the outside and She Gan clears the obstruction from within. One cold and one warm, one descending and one dispersing, they complement each other to resolve phlegm and stop wheezing far more effectively than either alone.

When to use: Cough and wheezing with audible phlegm rattling in the throat, especially with cold-type phlegm. The classic scenario from the Jin Gui Yao Lue: 'cough with upward-rushing Qi and water-chicken sound in the throat.'

Niu Bang Zi
Niu Bang Zi 1:1 (She Gan 6-9g : Niu Bang Zi 6-9g)

Both herbs clear Heat and benefit the throat, but through different mechanisms. She Gan resolves toxins and descends Lung Qi directly, while Niu Bang Zi (arctium fruit) disperses Wind-Heat and ventilates the Lung from the exterior. Combined, they address both the external pathogen and the internal Heat toxin causing throat inflammation.

When to use: Sore throat and swollen tonsils due to Wind-Heat invasion or Phlegm-Heat accumulation, especially when the throat pain is accompanied by external symptoms like fever and cough.

Huang Qin
Huang Qin 1:1 (She Gan 6-9g : Huang Qin 6-9g)

Huang Qin (scutellaria root) clears Heat from the upper body and dries Dampness in the Lungs, while She Gan resolves toxins and descends Phlegm from the throat. Together they powerfully clear Lung Heat and relieve throat inflammation, with Huang Qin addressing the systemic Lung Heat and She Gan focusing on the local throat obstruction.

When to use: Lung Heat patterns with sore throat, cough with yellow phlegm, and signs of upper body Heat such as a red face or bitter taste.

Shan Dou Gen
Shan Dou Gen 1:1 (She Gan 6g : Shan Dou Gen 6g)

Both are bitter, cold herbs that specialize in clearing Heat toxins from the throat, making this a strongly focused throat-healing pair. Shan Dou Gen (Sophora tonkinensis root) is especially potent at clearing Fire toxins, while She Gan adds Phlegm-dissolving and Qi-descending actions. Together they treat severe throat infections more aggressively than either alone.

When to use: Severe acute sore throat with marked swelling, pain, and difficulty swallowing, such as in acute tonsillitis or peritonsillar abscess. Can be ground to powder and blown into the throat.

Key Formulas

These well-known formulas feature She Gan in a prominent role

Bie Jia Jian Wan 鳖甲煎丸 Assistant

This complex formula from Zhang Zhongjing's Jin Gui Yao Lue uses She Gan (here called Wu Shan, roasted) to disperse accumulations and dissipate nodules. It demonstrates a lesser-known but classically documented action of She Gan: breaking apart masses and resolving stagnation. The formula treats malarial masses (accumulations beneath the ribs), showing She Gan's versatility beyond its primary throat and lung indications.

Comparable Ingredients

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

Shan Dou Gen
She Gan vs Shan Dou Gen

Both clear Heat toxins from the throat, but Shan Dou Gen is stronger at resolving intense Fire toxins and is preferred for the most severe, acutely swollen and painful throats. She Gan, while also treating sore throats, has the added ability to dissolve Phlegm and descend Lung Qi, making it more versatile for conditions that combine throat pain with cough and wheezing. Shan Dou Gen is also more toxic at higher doses and must be used more cautiously.

Jie Geng
She Gan vs Jie Geng

Both treat throat and lung conditions, but they work in opposite directions. Jie Geng (platycodon root) is neutral to slightly warm and raises Lung Qi upward, guiding other herbs to the throat and helping to expel Phlegm by pushing it out. She Gan is cold and descends Lung Qi downward, clearing Heat and dissolving Phlegm from within. They are often used together rather than as substitutes, combining Jie Geng's ascending action with She Gan's descending action.

Ban Lan Gen
She Gan vs Ban Lan Gen

Both clear Heat toxins and are used for throat conditions, but Ban Lan Gen (isatis root) has a broader antiviral and antipathogenic scope, commonly used for epidemic Heat toxin conditions and skin eruptions. She Gan is more specialized for the throat and lungs, with its unique Phlegm-dissolving and Qi-descending actions that Ban Lan Gen lacks. For pure sore throat with Phlegm and wheezing, She Gan is preferred; for sore throat in the context of epidemic febrile disease, Ban Lan Gen is more appropriate.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing She Gan

The most common adulterants of She Gan are rhizomes from related Iris species: 1. Chuan She Gan (川射干) — the rhizome of Iris tectorum Maxim., which is officially listed in the Chinese Pharmacopoeia as a separate herb. It has a similar but not identical chemical profile and is sometimes sold as She Gan. The two can be distinguished because Iris tectorum has wider, shorter leaves and purple flowers, and its rhizome tends to be denser with a different cross-section pattern. 2. Bai She Gan (白射干) — the rhizome of Iris dichotoma Pall., which has white flowers and a more greyish-brown rhizome with a yellowish-white cross-section. It is noted as slightly toxic and has different clinical applications. 3. Bian Zhu Gen (扁竹根) from Iris japonica Thunb. (butterfly flower) — its rhizome is yellowish-white with a sweeter taste, quite different from She Gan's strong bitterness. Authentic She Gan (Belamcanda chinensis) is best confirmed by its bright yellow cross-section, strong bitterness, and the presence of characteristic scattered vascular dots.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for She Gan

Non-toxic

She Gan is classified as non-toxic in the Chinese Pharmacopoeia and its acute toxicity in animal studies is very low. However, some classical sources (notably the Ben Cao Jing Ji Zhu of Tao Hongjing) describe it as having 'slight toxicity' (有小毒), and the Ming Yi Bie Lu warns that prolonged use 'causes deficiency' (久服令人虚). Modern research has identified iridal-type triterpenoids with some cytotoxic activity, and oleandrin-related glycosides have been noted as potential toxic components. At standard clinical dosages (3-10g), no toxic effects have been observed in pharmacological studies. The main risk of harm comes from overdosage, which can cause diarrhoea and gastrointestinal distress due to the herb's bitter, cold, descending nature rather than chemical toxicity per se.

Contraindications

Situations where She Gan should not be used or requires extra caution

Avoid

Pregnancy. She Gan has bitter, cold properties that descend and disperse. Classical sources note it can move Blood and unblock menstruation (通经闭), which poses a risk of stimulating uterine contractions or harming the fetus.

Avoid

Spleen deficiency with loose stools (脾虚便溏). She Gan's bitter, cold nature can further damage Spleen Yang and worsen diarrhoea.

Caution

Absence of true Heat or toxic Heat (病无实热). She Gan is strongly cold and descending. Using it when there is no genuine excess Heat pattern can injure the body's Qi and Yang.

Caution

Prolonged or excessive use. The Ming Yi Bie Lu warns that long-term use 'causes deficiency' (久服令人虚). She Gan should be used in short courses at standard doses, not as a long-term tonic.

Caution

Breastfeeding. Due to its cold nature, potential estrogenic activity from isoflavone constituents (tectorigenin), and the classical caution against use in this population, breastfeeding mothers should avoid this herb unless specifically prescribed.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Contraindicated during pregnancy. She Gan has traditionally been noted for its ability to unblock menstruation (通经闭) and move Blood, which indicates a risk of stimulating uterine activity. Its bitter, cold, strongly descending nature is also considered harmful to the fetus in TCM theory. Additionally, modern research has identified phytoestrogenic isoflavones (notably tectorigenin) that bind estrogen receptors and could potentially disrupt the hormonal environment of pregnancy. The Chinese Pharmacopoeia lists pregnancy as a contraindication (孕妇禁服).

Breastfeeding

She Gan should be avoided during breastfeeding. Its constituent isoflavones (particularly tectorigenin) have demonstrated estrogenic activity, including binding to both estrogen receptor alpha and beta. Transfer of these phytoestrogens through breast milk could potentially affect the nursing infant's hormonal milieu. Additionally, the herb's strongly bitter, cold nature may reduce milk production by impairing Spleen and Stomach function in the mother. Classical sources also caution against use during the breastfeeding period.

Children

She Gan may be used in paediatric patients for conditions such as acute pharyngitis or tonsillitis, but at reduced dosages appropriate to the child's age and weight. Standard paediatric practice is to use approximately one-third to one-half of the adult dose for children aged 3-6, and half to two-thirds for children 6-14. Its bitter, cold nature makes it especially important to avoid prolonged use in children, whose Spleen and Stomach systems are constitutionally delicate. She Gan appears in several commercially approved paediatric throat preparations in China, suggesting accepted safety at controlled doses.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with She Gan

Estrogen-related medications: She Gan's isoflavone constituents (particularly tectorigenin) have demonstrated phytoestrogenic activity, binding both estrogen receptor alpha and beta. Theoretically, this could interact with hormone replacement therapy (HRT), oral contraceptives, or selective estrogen receptor modulators (SERMs such as tamoxifen). Concurrent use should be monitored by a healthcare provider.

Hypoglycaemic agents: Isoflavonoids from She Gan (tectoridin and tectorigenin) have shown aldose reductase inhibitory and hypoglycaemic activity in animal studies. Patients taking insulin or oral hypoglycaemic drugs should use She Gan with awareness of potential additive blood sugar lowering effects, though clinical significance in humans has not been established.

Anticoagulant / antiplatelet drugs: Classical sources attribute Blood-moving properties to She Gan. While there is no strong pharmacological evidence of significant anticoagulant activity, caution is advisable when combining with warfarin or other blood-thinning medications.

Dietary Advice

Foods and dietary considerations when taking She Gan

While taking She Gan, avoid excessively cold or raw foods (such as cold salads, ice cream, or chilled drinks) to prevent compounding its cold nature and further burdening the digestive system. Warm, easily digestible foods are preferred. Spicy, greasy, or deep-fried foods should also be moderated, as these can generate more phlegm-heat and work against the herb's therapeutic purpose. If She Gan is being used for throat conditions, avoiding alcohol and irritating foods is advisable.

Botanical Description

Physical characteristics and morphology of the She Gan source plant

Belamcanda chinensis (L.) DC. (syn. Iris domestica) is a perennial herbaceous plant of the Iridaceae (iris) family, growing 50–120 cm tall. It has a stout, creeping, bright yellow rhizome with numerous fibrous roots. The stem is erect and the leaves are arranged in two flat, overlapping rows (like a fan), sword-shaped, 25–60 cm long and 2–4 cm wide, bluish-green and often covered with a whitish waxy bloom.

In summer (June–July), the plant produces terminal, branching flower clusters. Each flower has six spreading petals, orange to orange-red with scattered dark purplish-red spots, giving the flowers a distinctive speckled appearance. After flowering, the capsule-like fruits split open to reveal clusters of glossy black, round seeds that resemble blackberries, hence the English common name "blackberry lily."

She Gan grows in open hillsides, forest margins, roadsides, and field edges across much of China, as well as in Korea, Japan, and other parts of East Asia. It thrives in well-drained soil with moderate sun and is sometimes cultivated as an ornamental plant.

Sourcing & Harvesting

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

Harvesting season

Spring (just as new shoots emerge) or late autumn (after stems and leaves have withered), then cleaned of rootlets, washed, and dried in the sun.

Primary growing regions

She Gan is widely distributed across China and grows in most provinces. Historically, the premier producing regions (道地药材) were in the Nanyang area at the border of Henan and Hubei provinces, as documented from the Han dynasty through the Tang dynasty. In later periods, Hubei (especially Huanggang and Xiaogan areas, producing the prized 'Han She Gan' known for firm texture and yellow colour), Jiangsu (Nanjing area), Anhui (Chuzhou area, noted in Song dynasty texts), and Henan (Qinyang) became major sources. Sichuan, Jiangxi, Hunan, and Guizhou also produce She Gan. The herb is additionally found in Korea, Japan, India, and the Russian Far East.

Quality indicators

Good quality She Gan rhizome is stout and firm, with a yellowish-brown to dark brown exterior that shows dense ring-like markings and clear stem scars on the upper surface. The cross-section should be a vivid bright yellow colour with visible vascular dots or lines. It should have a faintly aromatic smell and a distinctly bitter taste with a slight pungency. Pieces that are yellowish in section, strongly bitter, and dense in texture are considered superior. Avoid rhizomes that are dark or blackened throughout, overly soft, have an ashy or pale section, or lack bitterness, as these indicate poor quality or age degradation.

Classical Texts

Key passages from the classical Chinese medical texts that describe She Gan and its therapeutic uses

Shen Nong Ben Cao Jing (神农本草经)

Original: 「主咳逆上气，喉痹咽痛，不得消息，散结气，腹中邪逆，食饮大热。」

Translation: "It governs cough with counterflow Qi rising upward, throat obstruction and sore throat with inability to breathe or speak, disperses knotted Qi, treats pathogenic counterflow in the abdomen, and excessive Heat from food and drink."

Ming Yi Bie Lu (名医别录)

Original: 「疗老血在心脾间，咳唾，言语气臭，散胸中热气。久服令人虚。」

Translation: "It treats old stagnant Blood lodged between the Heart and Spleen, coughing and spitting, foul-smelling breath, and disperses Heat in the chest. Prolonged use causes deficiency."

Ben Cao Gang Mu (本草纲目) — Li Shizhen

Original: 「射干，能降火，故古方治喉痹咽痛为要药。孙真人《千金方》治喉痹有乌翣膏。张仲景《金匮玉函》方治咳而上气，喉中作水鸡声，有射干麻黄汤。又治疟母鳖甲煎丸，亦用乌扇烧过，皆取其降厥阴相火也。火降则血散肿消，而痰结自解，症瘕自除矣。」

Translation: "She Gan can bring down Fire. Therefore, in ancient formulas it is the key herb for treating throat obstruction and sore throat. Sun Simiao's Qian Jin Fang has the Wu Sha Gao for throat obstruction. Zhang Zhongjing's Jin Gui Yao Lue has She Gan Ma Huang Tang for cough with upward counterflow Qi and frog-like sounds in the throat. The Bie Jia Jian Wan for treating malaria masses also uses Wu Shan (She Gan), roasted. All of these employ its ability to bring down Jue Yin ministerial Fire. When Fire descends, Blood disperses and swelling resolves, phlegm nodules naturally dissolve, and abdominal masses are eliminated."

Ben Cao Jing Shu (本草经疏)

Original: 「射干，苦能下泄，故善降；兼辛，故善散。故主咳逆上气，喉痹咽痛，不得消息，散结气，胸中邪逆。既降且散，益以微寒，故主食饮大热。」

Translation: "She Gan is bitter, which enables downward draining, so it excels at descending. It is also slightly acrid, so it excels at dispersing. This is why it governs cough with counterflow Qi, throat obstruction and sore throat, disperses knotted Qi, and resolves pathogenic counterflow in the chest. Since it both descends and disperses, and is additionally slightly cold, it governs excessive Heat from food and drink."

Historical Context

The history and evolution of She Gan's use in Chinese medicine over the centuries

She Gan has one of the longest documented histories of any Chinese medicinal herb. The name "射干" first appears in a non-medical context in Xunzi's Quan Xue Pian (Exhortation to Learning, c. 3rd century BCE), where it is used as a metaphor for a plant that, though its stem is only four inches long, appears tall because it grows atop a high cliff. The etymology of the name likely relates to the plant's tall, erect stem resembling a pole or staff. Li Shizhen in the Ben Cao Gang Mu explained that its fan-shaped leaf arrangement gave rise to many of its common names: Wu Shan (乌扇, "crow's fan"), Feng Yi (凤翼, "phoenix wing"), and Gui Shan (鬼扇, "ghost fan").

The medicinal use of She Gan was first recorded in the Shen Nong Ben Cao Jing (compiled during the Han dynasty), where it was classified and valued for treating throat obstruction and counterflow cough. Zhang Zhongjing's Jin Gui Yao Lue (c. 200 CE) features it prominently in She Gan Ma Huang Tang for wheezing with a characteristic "frog-in-the-throat" sound, and in Bie Jia Jian Wan for chronic malaria masses. There was historical confusion between She Gan (Belamcanda) and several Iris species (such as Yuan Wei / 鸢尾), with Tao Hongjing, Su Gong, Han Baosheng, and Li Shizhen all offering different views on how to distinguish them based on flower colour. Li Shizhen ultimately clarified that the yellow-flowered species with spotted petals was the true medicinal She Gan.

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of She Gan

1

Review of phytochemistry and bioactivity of Belamcandae chinensis rhizoma (2015)

Woźniak D, Matkowski A. Fitoterapia. 2015; 107: 1-14.

A comprehensive review summarizing the chemical constituents and biological effects of She Gan. The main phytochemicals identified are isoflavones (tectoridin, tectorigenin, irigenin), xanthone glycosides, stilbenes, and iridal-type triterpenoids. Pharmacological activities include anti-inflammatory, antioxidant, estrogenic, anti-angiogenic, antimutagenic, and hypoglycaemic effects. Tectorigenin was highlighted as a phytoestrogen with potential in hormone-dependent cancer therapy.

DOI
2

Selective estrogen receptor modulator (SERM) activities of Belamcanda chinensis extract and tectorigenin (2004, in vivo animal study)

Seidlova-Wuttke D, Hesse O, Jarry H, et al. Planta Medica. 2004; 70(9): 790-793.

Tectorigenin, the key isoflavone from She Gan, was shown to bind both estrogen receptor alpha and beta. In ovariectomized rats, it inhibited pulsatile LH secretion (relevant to hot flushes) and had strong osteotropic (bone-protective) effects, but showed no stimulatory effect on the uterus or mammary gland. This suggests She Gan constituents may act as selective estrogen receptor modulators, with potential applications in menopausal symptoms and osteoporosis.

PubMed
3

Inhibition of prostaglandin E2 production and COX-2 induction by tectorigenin and tectoridin (1999, in vitro study)

Kim YP, Yamada M, Lim SS, et al. Biochimica et Biophysica Acta. 1999; 1438(3): 399-407.

In rat peritoneal macrophages, tectorigenin and tectoridin (the two major isoflavones of She Gan) inhibited prostaglandin E2 production by suppressing COX-2 induction. Tectorigenin was the more potent inhibitor. This provides a mechanistic basis for She Gan's traditional use as an anti-inflammatory herb for sore throat and upper respiratory inflammation.

PubMed
4

Tectorigenin: A Review of Its Sources, Pharmacology, Toxicity, and Pharmacokinetics (2023, Review)

Rong J, Fu F, Han C, Wu Y, Xia Q, Du D. Molecules. 2023; 28(15): 5904.

A comprehensive review of tectorigenin covering its anti-inflammatory, antitumour, hepatoprotective, hypoglycaemic, and estrogenic properties. Acute toxicity studies in mice showed an oral LD50 of 1.78 g/kg, with no significant toxicity at doses up to 300 mg/kg over 28 days. The review noted poor oral bioavailability due to extensive first-pass metabolism (glucuronidation, sulfation), suggesting that future research should focus on improving delivery systems.

DOI
5

Isoflavonoids from Belamcanda chinensis rhizomes inhibit aldose reductase and sorbitol accumulation in diabetic rat tissues (2002, in vivo animal study)

Jung SH, Lee YS, Lee S, et al. Archives of Pharmacal Research. 2002; 25(3): 306-312.

Twelve phenolic compounds isolated from She Gan rhizomes were tested for aldose reductase inhibition. Tectoridin and tectorigenin showed the strongest inhibitory potency (IC50 values around 1 micromolar). When administered orally to diabetic rats for 10 days, both compounds significantly reduced sorbitol accumulation in the lens, sciatic nerve, and kidney, suggesting potential for preventing diabetic complications.

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.