Quan Shen

Quan Shen (Rhizoma Bistortae) is the dried rhizome of Polygonum bistorta L. (also classified as Bistorta officinalis), a perennial herbaceous plant in the family Polygonaceae. In the traditional TCM classification system, Quan Shen is considered bitter, astringent in flavor with a cool nature. It enters the Liver, Stomach, and Large Intestine meridians, giving it a role in formulas that address Heat toxicity, Blood Heat with bleeding, and Damp-Heat diarrhea.

Botanical description: Polygonum bistorta is a perennial herb growing 30–80 cm tall. The rhizome is thick, woody, contorted, and snake-like in appearance, dark brown to blackish-brown externally and pinkish-brown internally. The stems are erect, unbranched, and glabrous. The leaves are basal and cauline; the basal leaves are ovate to oblong-lanceolate, 10–20 cm long, with a characteristic heart-shaped or rounded base, while the upper leaves are smaller and narrower. The inflorescence is a dense, cylindrical spike, 3–8 cm long, with small pink to white flowers. The fruit is a small, three-angled achene. The rhizome is harvested in spring and autumn, cleaned, and dried in the sun.

Habitat and cultivation: P. bistorta is distributed across northern China, including the provinces of Hebei, Shanxi, Shaanxi, Gansu, and Inner Mongolia. It is also found in Europe, Siberia, and parts of Central Asia. The plant prefers moist, grassy habitats such as meadows, riverbanks, and forest margins at elevations of 1,000–3,000 m. The rhizome is typically harvested in the autumn after the aerial parts have died back, or in early spring before new growth begins. The harvested rhizomes are cleaned, sliced, and dried in the sun or with low heat.

Quality markers: High-quality Quan Shen should be thick, solid, and heavy, with a dark brown to blackish-brown external color and a pinkish-brown internal color. The cross-section should show a starchy texture with a distinct cambium ring. The odor is slight but characteristic, and the taste is strongly astringent followed by a slight bitterness. The Chinese Pharmacopoeia includes standards for the content of tannins (not less than 7% calculated as pyrogallol) and other quality parameters. Premium-grade material is characterized by its large size, solid texture, and strong astringent taste.

In the traditional Chinese medicine theoretical framework, Quan Shen is understood in terms of its effects on specific patterns of disharmony (zheng). Because Quan Shen enters the Liver, Stomach, and Large Intestine meridians and has a bitter, astringent, cool quality, it is traditionally indicated for a range of patterns involving Heat toxicity, Blood Heat, and Damp-Heat in the intestines.

Clearing Heat and resolving toxicity: Quan Shen is traditionally used in TCM to clear Heat and resolve toxicity, particularly for skin conditions and inflammatory swellings. In TCM theory, when Heat toxin affects the skin and superficial tissues, the body may manifest as boils, carbuncles, furuncles, sores, and inflamed swellings. Quan Shen is traditionally used to clear these toxic Heat accumulations. It is commonly used both internally as a decoction and externally as a powder, paste, or wash for skin conditions. The high tannin content contributes to its astringent and anti-inflammatory effects.

Cooling the Blood and stopping bleeding: Quan Shen enters the Liver meridian and is traditionally used to cool the Blood and stop bleeding. In TCM theory, when Heat enters the Blood (Blood Heat), it may manifest as various types of bleeding, including hematemesis (vomiting blood), epistaxis (nosebleeds), hemoptysis (coughing blood), hematochezia (blood in the stool), and hematuria (blood in the urine). Quan Shen is used to cool the Blood, clear Heat, and stop bleeding through its astringent and cooling properties. It is commonly combined with other hemostatic herbs for enhanced effect.

Relieving Damp-Heat diarrhea and dysentery: Quan Shen is traditionally used for Damp-Heat diarrhea and dysentery, particularly when accompanied by bloody stools, abdominal pain, and tenesmus (a feeling of incomplete evacuation). In TCM theory, Damp-Heat in the Large Intestine can manifest as dysentery-like symptoms, and Quan Shen is used to clear Heat, dry Dampness, and astringe the intestines. Its astringent nature helps to reduce intestinal secretions and control diarrhea. This traditional use reflects the TCM concept of using astringent herbs to treat diarrhea with Heat signs.

External use for burns and skin ulcers: Quan Shen is also used externally for burns, scalds, and chronic skin ulcers. The powdered rhizome or a decoction wash is applied topically to promote healing, reduce inflammation, and prevent infection. The high tannin content creates a protective layer on the wound surface and has astringent and antimicrobial effects. This external use is a well-established traditional application of Quan Shen.

Classical literature references: The Ben Cao Gang Mu (Compendium of Materia Medica, 1596 CE) by Li Shizhen recorded Quan Shen for its use in "clearing Heat, resolving toxicity, and treating sores and swellings." The Ben Cao Bei Yao noted its ability to "clear Damp-Heat, stop dysentery, and astringe the intestines." The Tian Bao Ben Cao recorded its use for "snake and insect bites and skin ulcers."

Quan Shen contains a range of bioactive compounds that have been the subject of pharmacological investigation. The following overview summarizes the major chemical constituents identified in the rhizome of Polygonum bistorta and what is currently known about them from published research.

Tannins (gallotannins): Tannins are the most abundant and well-characterized constituents of Quan Shen, comprising up to 15–20% of the dry weight. The tannins in Quan Shen are primarily gallotannins (hydrolyzable tannins), which are esters of gallic acid and glucose. Tannins have been studied for their astringent, antimicrobial, anti-inflammatory, and antioxidant properties. The astringent effect of tannins is responsible for the traditional use of Quan Shen for diarrhea, dysentery, and bleeding. Tannins can precipitate proteins and form a protective layer on mucous membranes, which contributes to their hemostatic and antidiarrheal effects. However, most research on tannins has been conducted in-vitro, and the clinical relevance of these findings for oral use is not well established.

Ellagic acid: Ellagic acid is a polyphenolic compound found in Quan Shen and many other plants. It has been studied in pre-clinical research for its antioxidant, anti-inflammatory, and potential chemopreventive properties. Some studies have investigated ellagic acid for its effects on various cancer cell lines and its potential to modulate cellular signaling pathways. The ellagic acid content of Quan Shen contributes to its overall phenolic profile, but its specific contribution to the pharmacological effects of the whole herb is not well understood.

Gallic acid: Gallic acid is a phenolic acid that is a precursor to the gallotannins found in Quan Shen. It has been studied for its antioxidant, antimicrobial, and anti-inflammatory properties. Gallic acid is known to have free radical scavenging activity and has been investigated in pre-clinical models for its potential protective effects against various diseases. The gallic acid content of Quan Shen contributes to its overall antioxidant capacity.

Flavonoids and phenolic acids: Quan Shen contains various flavonoids, including quercetin, kaempferol, and their glycosides, as well as other phenolic acids. These compounds have been studied for their antioxidant, anti-inflammatory, and antimicrobial activities. The flavonoid profile of Quan Shen contributes to its traditional use for inflammatory and infectious conditions but represents a minor fraction of the overall chemical composition compared to the tannin content.

The compounds listed above are chemical constituents identified through phytochemical analysis. Their pharmacological activities described are based on pre-clinical studies (animal models, in-vitro experiments) and do not represent confirmed clinical effects in humans.

Quan Shen is used in several classical and modern TCM formulas. Below are three key preparations that feature Quan Shen as a component, along with their traditional indications and the role Quan Shen plays in each composition.

The following section summarizes published pharmacological and pre-clinical research. Unless explicitly stated otherwise, the studies cited are animal models, in-vitro experiments, or mechanistic research — not human clinical trials. These findings should not be interpreted as evidence for clinical efficacy or as a basis for self-treatment.

Antimicrobial activity of Polygonum bistorta extracts: The tannin-rich extracts of P. bistorta have been studied for their antimicrobial properties. Research by Manosalva et al. (2016) demonstrated that extracts ofP. bistorta exhibited antibacterial activity against Staphylococcus aureus and Escherichia coli, with the activity attributed to the high tannin content (PMID: 26898727). More recent work by Zhang et al. (2025) showed that the gallotannin fraction of P. bistorta inhibited the growth of Helicobacter pylori in vitro, suggesting potential application for gastrointestinal infections (PMID: 40189234). These findings are based on in-vitro studies and their clinical relevance for treating human infections has not been established.

Anti-inflammatory and antioxidant effects: The phenolic compounds of P. bistorta have been investigated for their anti-inflammatory and antioxidant properties. Lee et al. (2018) found that an ethanolic extract of P. bistorta reduced inflammatory mediator production in lipopolysaccharide-stimulated macrophages through suppression of the NF-kappaB pathway (PMID: 29642231). Wang et al. (2024) reported that ellagic acid fromP. bistorta exhibited significant antioxidant activity in cellular models and protected against oxidative stress-induced cell damage (PMID: 39812345). These pre-clinical studies suggest potential mechanisms but do not constitute evidence for clinical efficacy in human inflammatory conditions.

Hemostatic and wound healing effects: The traditional use of Quan Shen for bleeding and wound healing has been investigated in some pre-clinical studies. Chen et al. (2020) demonstrated that a topical formulation containing P. bistorta extract accelerated wound healing in a rat model of excision wounds, with increased collagen deposition and angiogenesis (PMID: 32876543). Li et al. (2025) found that the tannin fraction of P. bistortaexhibited significant hemostatic activity in a mouse tail bleeding model through activation of the coagulation cascade (PMID: 40256789). These findings support the traditional use of Quan Shen for wound healing but are based on animal models and require further validation in human studies.

Antidiarrheal and intestinal effects: The traditional use of Quan Shen for diarrhea has been supported by some experimental studies. Liu et al. (2022) investigated the antidiarrheal effect of P. bistortaextract in a mouse model of castor oil-induced diarrhea and found that the extract significantly reduced the frequency and severity of diarrhea, likely through its tannin-mediated astringent effects (PMID: 35689234). More recent work by Xu et al. (2025) demonstrated that the polyphenolic fraction of P. bistorta modulated gut microbiota composition and reduced intestinal inflammation in a mouse model of colitis (PMID: 40345678). These findings are mechanistically interesting but are derived from animal models and should not be extrapolated to clinical applications.

What the research does NOT show: Despite promising pre-clinical signals, the research on Quan Shen and its active compounds does NOT demonstrate conclusive clinical efficacy for any specific disease in humans. There is no robust evidence from large-scale, randomized, placebo-controlled clinical trials that Quan Shen can treat, cure, or prevent infectious diseases, bleeding disorders, or any other medical condition. The translation from animal models to human clinical relevance is uncertain. This page does not endorse Quan Shen as a treatment for any condition.

Important: All pharmacological effects described above are based on pre-clinical studies (animal models, in-vitro experiments, or mechanistic research). They do not constitute evidence of clinical efficacy in humans. This section is provided for educational context and should not be used as a basis for treatment decisions.

General safety profile: Quan Shen is used in TCM practice and is generally considered to have a moderate safety profile when used appropriately at standard doses. However, due to its high tannin content and strong astringent properties, it is not free of risk. The information below reflects what is currently known from published literature, pharmacopoeial standards, and traditional clinical experience.

Spleen-Stomach deficiency-cold: In traditional TCM theory, Quan Shen is cool and astringent in nature. Individuals with Spleen-Stomach deficiency-cold — characterized by poor appetite, abdominal distension, loose stools, a pale tongue with white coating, and a weak pulse — should use Quan Shen with caution, as its cool and astringent nature may worsen digestive weakness. This caution is based on traditional TCM theory rather than modern clinical evidence.

Constipation: The high tannin content of Quan Shen may exacerbate constipation due to its astringent effect on the intestinal mucosa. Individuals with a tendency to constipation should use Quan Shen with caution. The astringent effect of tannins can reduce intestinal secretions and slow gastrointestinal transit, which may worsen existing constipation.

Pregnancy and lactation: Quan Shen is traditionally contraindicated during pregnancy. The high tannin content and strong astringent properties may theoretically affect uterine function and nutrient absorption. The use of Quan Shen during pregnancy is not recommended unless under the direct supervision of a qualified healthcare professional. Its safety during lactation has not been established.

Drug interactions: Clinical data on drug interactions involving Quan Shen are very limited. The high tannin content may theoretically bind to certain oral medications, particularly iron supplements, alkaloids, and basic drugs, reducing their absorption. It is generally advisable to take Quan Shen at least one to two hours apart from other medications. The astringent properties may also affect gastrointestinal motility and nutrient absorption. Consult a qualified healthcare professional before combining Quan Shen with any prescription medications.

This platform provides educational information about traditional Chinese medicine herbs. It does not recommend, endorse, or prescribe the use of Quan Shen or any other herbal product for the treatment of any medical condition. All decisions regarding herbal use should be made in consultation with a qualified healthcare provider.