Hermetica Superfood Encyclopedia
The Short Answer
Glycyrrhiza uralensis delivers anti-inflammatory and hepatoprotective effects primarily through its triterpenoid saponin glycyrrhizin (~3.37% in dried root) and chalcone flavonoids including isoliquiritigenin, which suppress inducible nitric oxide synthase (iNOS) expression and NO production in hepatocytes with isoliquiritigenin achieving an IC₅₀ of 11.9 μM. The most clinically significant evidence to date derives from preclinical models, where the Nrf2-activating isoprenylated phenolic echinatin attenuated CCl₄-induced liver injury in mice at 5–10 mg/kg IP, and CYP450 modulation studies in HepG2 cells at 25–50 μM confirm meaningful pharmacokinetic interaction potential.
CategoryRoot
GroupSoutheast Asian
Evidence LevelPreliminary
Primary KeywordChinese licorice root benefits
Chinese Licorice Root — botanical close-up
Health Benefits
**Anti-inflammatory Activity**
Isoliquiritigenin and liquiritigenin suppress IL-1β-stimulated iNOS gene expression and NO production in rat hepatocytes, with isoliquiritigenin yielding the lowest IC₅₀ of 11.9 μM among all tested flavonoids, outperforming glycyrrhizin by over 98-fold in potency.
**Hepatoprotection**
The isoprenylated phenolic echinatin activates the Nrf2 antioxidant-response pathway, reducing CCl₄-induced hepatocellular damage in mouse models at intraperitoneal doses of 5–10 mg/kg, while glycyrrhizin broadly supports liver cell integrity through anti-inflammatory and membrane-stabilizing mechanisms.
**Respiratory and Cough Relief**
Traditional Southeast Asian and Chinese formulations employ hot-water root extracts to soothe bronchial inflammation and reduce cough reflex, with glycyrrhizin's surfactant and demulcent properties likely contributing to mucosal protection.
**Immunomodulation**
Glycyrrhizin and associated flavonoids modulate innate immune signaling by reducing pro-inflammatory cytokine cascades initiated by IL-1β, and echinatin's Nrf2 activation supports systemic oxidative stress regulation relevant to immune homeostasis.
**Cytotoxic and Anticancer Potential**
The isoprenylated phenolic topazolin exhibits in vitro cytotoxicity against HepG2 (hepatocellular), SW480 (colon), A549 (lung), and MCF7 (breast) cancer cell lines with IC₅₀ values ranging from 7.3 to 23.1 μM, though no clinical translation has been established.
**CYP450-Mediated Pharmacokinetic Modulation**
Root extract constituents downregulate CYP1A2, CYP2D6, and CYP3A4 mRNA in HepG2 cells at 25–50 μM concentrations, and glycyrrhizin activates pregnane X receptor (PXR), which can modulate metabolism of co-administered drugs such as lidocaine.
**Antioxidant Defense**: Echinatin and broader phenolic fractions from G
uralensis extracts upregulate Nrf2-dependent antioxidant genes, with in vitro data showing 72% hepatocyte viability maintained at 0.54 μM extract concentration under oxidative challenge.
Origin & History
Natural habitat
Glycyrrhiza uralensis is native to northern and northeastern China, Mongolia, and parts of Siberia, thriving in semi-arid steppe environments with well-drained, alkaline loam soils at elevations up to 1,500 meters. It has been cultivated for millennia in Chinese provinces including Gansu, Xinjiang, and Inner Mongolia, where roots are harvested from plants aged three to five years. Cultivation requires full sun and low rainfall, with wild-harvested roots historically preferred for medicinal use due to higher glycyrrhizin accumulation.
“Glycyrrhiza uralensis, designated Gancao (甘草, 'sweet herb') in Traditional Chinese Medicine, has been documented in Chinese materia medica texts for over 2,000 years, appearing prominently in the Shennong Bencao Jing (circa 1st century CE) as a 'superior herb' capable of harmonizing the actions of other medicinal herbs in compound formulas. It holds the distinction of being one of the most frequently prescribed herbs in the Chinese pharmacopoeia, used to regulate drug properties (jun-chen-zuo-shi system), tonify the spleen and stomach qi, moisten the lungs to relieve cough, and resolve toxicity in both food and medicinal contexts. Traditional preparation involved slow decoction of dried root slices in water, sometimes honey-roasted (Zhigancao) to amplify tonic spleen effects and reduce cold properties, with honey-roasting also being pharmacologically significant as it alters flavonoid extraction profiles. The roots were historically traded along the Silk Road, establishing G. uralensis as an early commodity herb whose sweet glycyrrhizin content (~50 times sweeter than sucrose) made it recognizable across Asian, Middle Eastern, and eventually European herbal traditions.”Traditional Medicine
Scientific Research
The body of evidence for Glycyrrhiza uralensis consists predominantly of in vitro studies in isolated rat hepatocytes and human HepG2 hepatoma cell lines, and in vivo murine hepatotoxicity models; no published randomized controlled trials with defined sample sizes or quantified effect sizes in humans were identified in the current literature base for this specific species. Preclinical data are methodologically rigorous within their scope, with reproducible IC₅₀ values for individual flavonoids and dose-response relationships for echinatin in CCl₄ mouse models at 5–10 mg/kg IP, providing a mechanistic foundation but not direct clinical translation. Some evidence for hepatoprotective properties of glycyrrhizin (shared with G. glabra) exists in the clinical literature, but these studies are not species-specific to G. uralensis and lack sufficient reporting of effect sizes and standardization to inform dosing guidelines. Overall, the evidence base is best classified as preclinical-dominant, with compelling mechanistic plausibility but an absence of adequately powered human clinical trials specific to G. uralensis extracts.
Preparation & Dosage
Traditional preparation
**Traditional Hot-Water Root Decoction**
2–9 g of dried root per day decocted in water, consistent with Chinese Pharmacopoeia guidance for Radix Glycyrrhizae; consumed as tea or incorporated into multi-herb formulas
**Standardized Aqueous Extract (GR Extract)**
Prepared by hot-water extraction of roots/stolons followed by Diaion HP-20 resin fractionation yielding active fractions (GR-60, GR-80, GR-100); standardization to glycyrrhizin content (≥3% w/w by HPLC) is recommended.
**Purified Phenolic Fractions**
Isoliquiritin-enriched fractions purified via Cosmosil C18 or Wakogel C-200 chromatography; effective in vitro concentrations range from 11.9–41.2 μM for anti-inflammatory flavonoids, with no established oral clinical dose equivalent.
**Capsule/Tablet Supplements**
300–600 mg dried root extract per dose; deglycyrrhizinated licorice (DGL) formulations remove >97% glycyrrhizin to reduce mineralocorticoid side effects but may diminish hepatoprotective glycyrrhizin-specific effects
Commercially available products typically provide .
**Timing**
Traditional use integrates G. uralensis as a harmonizing herb in multi-ingredient decoctions taken with or after meals; no pharmacokinetically derived optimal timing has been established for isolated extracts.
**Standardization Note**
Products should specify glycyrrhizic acid content; the Chinese Pharmacopoeia requires ≥2.0% glycyrrhizic acid and ≥1.0% liquiritin in Radix Glycyrrhizae.
Nutritional Profile
The dried root of Glycyrrhiza uralensis is not a significant source of macronutrients or micronutrients in typical medicinal doses but is rich in pharmacologically active phytochemicals. Glycyrrhizin (glycyrrhizic acid) constitutes approximately 3.37% of dry root weight, representing the dominant triterpenoid saponin and primary sweet principle. Quantified flavonoid concentrations in standardized extracts include isoliquiritin (~234 mg per purified fraction; 0.26 mg/mL in liquid extract), liquiritin (~8.8 mg per fraction; 0.45 mg/mL), isoliquiritin apioside (0.43 mg/mL), liquiritigenin (trace to 16.4 mg/fraction), and isoliquiritigenin (4.3 mg/fraction). Isoprenylated phenolics including echinatin and topazolin are present in minor quantities with high biological potency. Bioavailability of glycyrrhizin from oral ingestion involves intestinal hydrolysis by gut microbiota to the aglycone 18β-glycyrrhetinic acid, which is the primary systemically absorbed form; flavonoid bioavailability is enhanced by glucuronidase activity but remains variable across individuals.
How It Works
Mechanism of Action
The primary anti-inflammatory mechanism operates through suppression of iNOS gene transcription and resultant reduction of nitric oxide production in IL-1β-stimulated hepatocytes; isoliquiritigenin (IC₅₀ 11.9 μM), liquiritigenin (IC₅₀ 18.5 μM), isoliquiritin (IC₅₀ 41.2 μM), and liquiritin (IC₅₀ 29.4 μM) are the principal active chalcone and flavanone contributors, while glycyrrhizin itself is comparatively weak at this target (IC₅₀ 1,176 μM). Hepatoprotection is further mediated by echinatin's activation of the Nrf2/ARE (antioxidant response element) pathway, upregulating phase II detoxification enzymes including heme oxygenase-1 and glutathione S-transferase, thereby reducing oxidative hepatocellular injury. Glycyrrhizin acts as a ligand for pregnane X receptor (PXR), inducing CYP3A expression and simultaneously inhibiting CYP2E1 activity, which reduces bioactivation of hepatotoxic substrates such as CCl₄. Over 122 characterized compounds in G. uralensis roots collectively modulate multiple nodes in inflammatory, oxidative, and xenobiotic-metabolizing cascades, producing pleiotropic pharmacological effects at physiologically relevant concentrations.
Clinical Evidence
No species-specific clinical trials for Glycyrrhiza uralensis with defined populations, control arms, and quantified human outcomes were identified in the searched literature. Preclinical hepatoprotection studies demonstrate statistically significant reduction in liver injury markers in CCl₄-challenged mice using echinatin at 5–10 mg/kg IP, and in vitro iNOS suppression is well-characterized across multiple cell models. Broader glycyrrhizin clinical data from related Glycyrrhiza species suggest hepatoprotective effects in humans, but methodological heterogeneity and lack of species-level specificity limit direct application to G. uralensis formulations. Confidence in clinical efficacy remains low pending dedicated human trials; current evidence supports biological plausibility rather than proven therapeutic outcomes.
Safety & Interactions
At doses consistent with traditional medicinal use, Glycyrrhiza uralensis root extracts demonstrate low direct hepatocellular toxicity, with no lactate dehydrogenase (LDH) release detected in hepatocytes exposed to active flavonoid concentrations in vitro, suggesting a favorable therapeutic index at pharmacologically relevant doses. Chronic or high-dose use of non-deglycyrrhizinated preparations carries risk of pseudohyperaldosteronism due to glycyrrhizin's inhibition of 11β-hydroxysteroid dehydrogenase type 2, leading to sodium retention, hypokalemia, hypertension, and edema; the European Medicines Agency cautions against daily intake exceeding 100 mg glycyrrhizin. Significant drug interactions arise from CYP450 modulation: G. uralensis constituents inhibit CYP1A2, CYP2D6, and CYP3A4 at 25–50 μM in HepG2 cells and activate PXR-mediated CYP3A induction, creating bidirectional interaction potential with drugs including warfarin, statins, lidocaine, oral contraceptives, and corticosteroids. Contraindications include known hypertension, hypokalemia, renal insufficiency, congestive heart failure, liver cirrhosis, and pregnancy (due to potential estrogenic and cortisol-potentiating effects); lactation safety has not been established for concentrated extracts.
Synergy Stack
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Also Known As
Glycyrrhiza uralensis Fisch. ex DC.GancaoChinese licoriceUral licoriceRadix Glycyrrhizae甘草
Frequently Asked Questions
What is the difference between Glycyrrhiza uralensis and Glycyrrhiza glabra?
Glycyrrhiza uralensis (Chinese licorice) and Glycyrrhiza glabra (European licorice) both contain glycyrrhizin as the primary active saponin, but G. uralensis is distinguished by higher concentrations of species-specific flavonoids such as isoliquiritin, liquiritin, and isoprenylated phenolics like echinatin and topazolin. The Chinese Pharmacopoeia officially recognizes G. uralensis and G. inflata as the primary medicinal sources of Radix Glycyrrhizae, and phytochemical profiling via HPLC can differentiate the species by their characteristic flavanone and chalcone ratios. Clinically, both species share broadly similar mechanisms, but compound-specific potency data apply to each species individually.
Is licorice root safe to take daily, and what are the risks of long-term use?
Long-term daily use of non-deglycyrrhizinated Glycyrrhiza uralensis preparations carries a well-documented risk of pseudohyperaldosteronism when glycyrrhizin intake exceeds approximately 100 mg/day, leading to sodium retention, hypokalemia, elevated blood pressure, and peripheral edema through inhibition of the enzyme 11β-hydroxysteroid dehydrogenase type 2. The European Medicines Agency and international regulatory bodies advise limiting glycyrrhizin consumption accordingly, and individuals with pre-existing hypertension, heart failure, or kidney disease should avoid standard preparations entirely. Deglycyrrhizinated licorice (DGL) formulations substantially reduce this risk but may not retain the full hepatoprotective glycyrrhizin-mediated effects.
What drugs does licorice root interact with?
Glycyrrhiza uralensis constituents modulate multiple cytochrome P450 enzymes in human liver cells, with in vitro evidence showing inhibition of CYP1A2, CYP2D6, and CYP3A4 mRNA expression at 25–50 μM, and PXR-mediated induction of CYP3A4 that could alter metabolism of drugs including warfarin, statins, certain antiepileptics, oral contraceptives, and immunosuppressants like cyclosporine. Additionally, glycyrrhizin's mineralocorticoid-potentiating activity can antagonize antihypertensive medications and amplify hypokalemic effects of diuretics such as thiazides and loop diuretics. Patients taking corticosteroids should exercise caution as glycyrrhizin can inhibit cortisol metabolism, intensifying steroid effects.
How much glycyrrhizin is in Chinese licorice root extract?
Dried roots of Glycyrrhiza uralensis contain approximately 3.37% glycyrrhizin (glycyrrhizic acid) by dry weight, making it one of the higher-concentration natural sources of this triterpenoid saponin. Standardized extracts for supplementation should specify glycyrrhizic acid content by HPLC; the Chinese Pharmacopoeia mandates a minimum of 2.0% glycyrrhizic acid in official Radix Glycyrrhizae. A typical 300 mg dose of a 2:1 concentrated root extract would therefore deliver approximately 20 mg or more of glycyrrhizin, which approaches cautionary daily thresholds with multiple daily doses.
What does the research say about licorice root for liver protection?
Preclinical research provides mechanistically compelling evidence for G. uralensis hepatoprotection: the isoprenylated phenolic echinatin activates the Nrf2/ARE pathway, reducing CCl₄-induced oxidative liver damage in mice at 5–10 mg/kg IP, while chalcone flavonoids including isoliquiritigenin suppress iNOS-mediated hepatocellular nitrosative stress with IC₅₀ values as low as 11.9 μM in isolated rat hepatocytes. However, no species-specific randomized controlled clinical trials in humans with defined populations and measured liver function outcomes have been published for G. uralensis extracts, meaning clinical confidence in hepatoprotection remains limited to extrapolation from preclinical models and broader glycyrrhizin literature. The evidence warrants cautious optimism and supports use as a complementary agent in integrative hepatology protocols, but does not yet substitute for evidence-based hepatological interventions.
What is isoliquiritigenin and why is it important in Chinese licorice root?
Isoliquiritigenin is a flavonoid compound found in Chinese licorice root (Glycyrrhiza uralensis) that demonstrates potent anti-inflammatory activity by suppressing nitric oxide (NO) production and iNOS gene expression in liver cells. Research shows isoliquiritigenin has an IC₅₀ of 11.9 μM, making it approximately 98-fold more potent than glycyrrhizin at reducing inflammatory markers, which explains why it may be the primary active compound responsible for the herb's hepatoprotective benefits. This compound specifically targets IL-1β-stimulated inflammation, suggesting Chinese licorice root may be particularly effective for conditions involving inflammatory stress.
How does the Nrf2 pathway relate to Chinese licorice root's health benefits?
Chinese licorice root contains echinatin, an isoprenylated phenolic compound that activates the Nrf2 (nuclear factor erythroid 2-related factor 2) antioxidant-response pathway, a master regulator of cellular defense against oxidative stress. Activation of this pathway increases the body's production of endogenous antioxidants and phase II detoxification enzymes, which protect cells from damage. This mechanism represents a distinct hepatoprotective pathway beyond simple antioxidant effects, making Chinese licorice root a multi-target botanical for liver and cellular health.
Which compounds in Chinese licorice root are most responsible for its anti-inflammatory effects?
While glycyrrhizin is the most well-known compound in licorice root, the flavonoids isoliquiritigenin and liquiritigenin are significantly more potent anti-inflammatory agents on a per-molecule basis, with isoliquiritigenin being the most active. These flavonoids work by inhibiting the expression of inflammatory enzymes and signaling molecules (iNOS and IL-1β pathways) in hepatocytes, whereas glycyrrhizin operates through different mechanisms. For those seeking maximum anti-inflammatory benefit, extracts standardized to flavonoid content—particularly isoliquiritigenin—may be more effective than whole-root preparations standardized only to glycyrrhizin content.
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