Hermetica Superfood Encyclopedia
The Short Answer
Oroxylum indicum contains a suite of flavonoids — principally baicalein, chrysin, oroxylin A, baicalin, and oroxin A-D — that exert antioxidant, anti-inflammatory, antimicrobial, and anticancer effects through free radical scavenging, metal chelation, and modulation of inflammatory mediators. Preclinical in vitro studies demonstrate dose-dependent radical scavenging and antiglycation activity in stem bark ethanol extracts, and the plant is traditionally employed in Burmese medicine as a first-line remedy for diarrhea, though no human clinical trial data currently substantiate these effects with quantified effect sizes.
CategoryHerb
GroupSoutheast Asian
Evidence LevelPreliminary
Primary KeywordOroxylum indicum benefits
Oroxylum indicum — botanical close-up
Health Benefits
**Antioxidant Activity**
Stem bark ethanol extracts exhibit dose-dependent free radical scavenging and metal-chelating activity, with reducing power and total antioxidant capacity measured as quercetin equivalents in in vitro assays, attributed primarily to phenolic flavonoids such as baicalein and chrysin.
**Anti-inflammatory Effects**
Flavonoids including baicalein and oroxylin A are associated with suppression of pro-inflammatory signaling, with stem bark extracts demonstrating anti-inflammatory potential in preclinical models, though specific cytokine targets have not yet been fully characterized in published results.
**Antimicrobial Properties**
Leaf extracts have shown activity against gram-negative Pseudomonas aeruginosa and gram-positive Bacillus subtilis in vitro, with phytochemical screening identifying flavonoids, tannins, and phenols as the likely antimicrobial constituents contributing to this activity.
**Hepatoprotective Potential**
Baicalein, one of the dominant flavonoids in Oroxylum indicum, is associated with liver protection through antioxidant mechanisms and reduction of oxidative stress-induced hepatocellular damage, as documented in preclinical studies of baicalein-rich plant sources.
**Anticancer Activity**: Multiple flavonoids present in Oroxylum indicum
including baicalein, chrysin, and oroxylin A — have demonstrated antiproliferative effects against various cancer cell lines in preclinical research, with mechanisms proposed to involve apoptosis induction and cell cycle arrest.
**Antiglycation Effects**
Stem bark extracts exhibit antiglycation potential relevant to diabetes management, suggesting that the plant's phenolic content may inhibit advanced glycation end-product (AGE) formation, a key contributor to diabetic complications.
**Traditional Antidiarrheal Use**
In Burmese traditional medicine, stem bark preparations are employed to treat diarrhea, likely reflecting the astringent tannin content and antimicrobial flavonoids that may reduce intestinal inflammation and pathogen load, though formal clinical validation is lacking.
Origin & History
Natural habitat
Oroxylum indicum is a deciduous tree native to Southeast Asia, distributed across India, Myanmar, Thailand, Malaysia, the Philippines, and southern China, typically growing in tropical and subtropical forests, forest margins, and disturbed areas up to 1,200 meters elevation. It thrives in well-drained loamy soils under humid, warm conditions and is commonly found along riverbanks and roadsides. The tree has been cultivated in traditional homegardens across Myanmar, India, and Thailand for its edible young pods, medicinal bark, and seeds.
“Oroxylum indicum has been documented in Ayurvedic medicine under the Sanskrit name 'Shyonaka,' where it figures as one of the ten roots comprising the classical Dashamula formulation, used for respiratory, rheumatic, and digestive conditions for over two millennia. In Burmese traditional medicine, stem bark preparations are a recognized treatment for diarrhea and gastrointestinal complaints, while in Thai traditional medicine the plant — known as 'Pheka' — is employed for liver ailments, fever, and skin diseases. Chinese traditional medicine utilizes the seeds under the name 'Mu Hu Die' (木蝴蝶), prescribing them for coughs, throat inflammation, and liver and stomach disorders, and the flat, winged seeds have long been used as a cultural ornamental element. The plant's wide geographic distribution and multipurpose use across distinct Asian medical traditions, combined with its culinary role in Southeast Asian cooking, reflect its deep integration into the material culture and healing practices of the region.”Traditional Medicine
Scientific Research
The current body of evidence for Oroxylum indicum is confined entirely to in vitro and phytochemical characterization studies, with no published human clinical trials reporting sample sizes, randomization, or quantified clinical outcomes. In vitro antioxidant studies using stem bark ethanol extracts demonstrate dose-dependent reducing power and total antioxidant capacity expressed as quercetin equivalents, and antimicrobial assays confirm inhibitory activity against P. aeruginosa and B. subtilis from leaf extracts. Endophytic fungal extracts isolated from Oroxylum indicum leaves (notably OI-L6, showing 55.16 μg GAE/mg total phenolic content, and OI-L8 at 26.52 μg GAE/mg) have been characterized by HPTLC, adding complexity to the plant's bioactive landscape but without in vivo or clinical corroboration. The evidence base is preliminary and insufficient to establish efficacy, dosing, or safety in humans; most data derive from small-scale laboratory experiments and should be interpreted with significant caution.
Preparation & Dosage
Traditional preparation
**Traditional Stem Bark Decoction (Burmese/Southeast Asian)**
Bark is boiled in water and consumed as a tea for diarrhea; no standardized dose is established, but folk practice typically uses 5–10 grams of dried bark per preparation.
**Ethanol Stem Bark Extract (Research Grade)**
Used in preclinical studies for antioxidant and antiglycation assessment; no human-applicable dose has been derived from these investigations.
**Leaf Poultice or Infusion**
Fresh or dried leaves are prepared as infusions or topical poultices in traditional antimicrobial applications across South and Southeast Asian medicine systems.
**Edible Young Pods (Culinary Use)**
Immature seed pods are consumed as a vegetable in Thai, Indian, and Burmese cuisines, representing a dietary form with incidental flavonoid intake.
**Standardization**
No commercial supplement standardization (e.g., percentage baicalein or chrysin) has been established for Oroxylum indicum extracts specifically.
**Dosage Note**
Effective supplemental doses for humans have not been determined through clinical trials; all dosing references remain based on traditional use or in vitro research concentrations not directly translatable to human equivalents.
Nutritional Profile
Oroxylum indicum is principally characterized by its flavonoid content rather than conventional macronutrient density, with baicalein, baicalin, chrysin, oroxylin A, and the oroxin glycoside series (oroxin A–D) constituting the primary bioactive phytochemicals; absolute tissue concentrations in the plant have not been precisely quantified in the reviewed literature. Stem bark ethanol extracts contain alkaloids, glycosides, tannins, and flavonoids, while leaf extracts yield phlobatannins, phenols, flavonoids, tannins, and glycosides but notably lack terpenoids by phytochemical screening. Ursolic acid, a pentacyclic triterpenoid with anti-inflammatory and metabolic properties, has also been identified. The young edible pods contribute dietary fiber, vitamins, and minerals typical of leguminous vegetables, though precise micronutrient assays for the pods are not well-documented in the available literature. Flavonoid bioavailability from plant matrices is generally influenced by glycosylation status — glycosides such as baicalin require intestinal deglycosylation before absorption, potentially limiting bioavailability compared to aglycone forms like baicalein.
How It Works
Mechanism of Action
Oroxylum indicum's primary flavonoids — baicalein, chrysin, oroxylin A, and their glycoside forms baicalin and oroxin A-D — exert antioxidant effects through direct hydrogen atom donation to free radicals (DPPH, ABTS) and chelation of transition metal ions (Fe²⁺, Cu²⁺) that would otherwise catalyze lipid peroxidation via Fenton-type reactions, thereby protecting cellular membranes from oxidative damage. Baicalein and oroxylin A are known in broader phytochemical literature to inhibit NF-κB and COX-2 pathways, reducing the transcription of pro-inflammatory cytokines such as TNF-α and IL-6, though specific pathway data for Oroxylum indicum extracts remain undercharacterized in published research. Chrysin exhibits inhibitory effects on aromatase (CYP19A1) and has been associated with modulation of the PI3K/Akt/mTOR signaling cascade in cancer cell models, contributing to the antiproliferative effects observed in vitro. Tannins and phlobatannins present in stem bark and leaf extracts further contribute astringent and protein-precipitating actions relevant to antidiarrheal and antimicrobial activities through disruption of microbial cell membranes and inhibition of bacterial adhesion.
Clinical Evidence
No human clinical trials have been conducted or published for Oroxylum indicum as of the most recent available data, meaning there are no randomized controlled trials, cohort studies, or case series from which to draw effect sizes, confidence intervals, or clinical recommendations. The clinical relevance of the plant is currently inferred from traditional ethnomedicinal use — particularly its antidiarrheal application in Burmese medicine — and from in vitro preclinical data demonstrating antioxidant, antimicrobial, antiglycation, and antiproliferative activities. Individual flavonoids present in the plant, especially baicalein and chrysin, have been more extensively studied in isolation through in vitro and animal models, offering mechanistic plausibility but not direct clinical evidence for Oroxylum indicum preparations specifically. Confidence in clinical outcomes is very low; the plant remains a candidate for future pharmacological investigation rather than an evidence-based therapeutic agent.
Safety & Interactions
Formal safety data for Oroxylum indicum preparations in humans are absent from the published literature; no dose-ranging toxicity studies, adverse event reporting from clinical trials, or established tolerable upper intake levels exist for this plant or its extracts. The individual flavonoids baicalein and chrysin, when studied in isolation at high doses in preclinical models, have been associated with potential endocrine-modulating effects (particularly chrysin's aromatase inhibition), which raises theoretical concerns for use in individuals with hormone-sensitive conditions, though this has not been demonstrated specifically for whole Oroxylum indicum extracts. Drug interaction data are not available, but the presence of potent CYP450-modulating flavonoids (baicalein is known to interact with CYP1A2, CYP2C9, and CYP3A4 in preclinical models) suggests a theoretical risk of pharmacokinetic interactions with drugs metabolized by these enzymes, including anticoagulants, antiepileptics, and immunosuppressants. Oroxylum indicum is not recommended during pregnancy or lactation due to complete absence of safety data, and its historical use as a medicinal plant does not substitute for evidence-based safety assessment in vulnerable populations.
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Also Known As
Indian Trumpet FlowerOroxylum indicum (Oroxylum indicum)Midnight HorrorSyonakaShyonakaPhekaOroxylum indicum (L.) KurzMu Hu DieBroken Bones Tree
Frequently Asked Questions
What is Oroxylum indicum used for in traditional medicine?
In Burmese traditional medicine, Oroxylum indicum stem bark preparations are primarily used to treat diarrhea and gastrointestinal complaints. Across broader Southeast Asian and Ayurvedic traditions, the plant has been employed for liver conditions, respiratory ailments, fever, rheumatic diseases, and skin disorders, with the seeds specifically used in Chinese medicine for coughs and throat inflammation under the name Mu Hu Die.
What are the main bioactive compounds in Oroxylum indicum?
The primary bioactive compounds are flavonoids, including baicalein, baicalin, chrysin, oroxylin A, oroxin A, oroxin B, oroxin C, oroxin D, and hispidulin, along with the triterpenoid ursolic acid. Stem bark extracts also contain alkaloids, tannins, and glycosides, while leaf extracts yield phlobatannins and phenolic compounds; together these constituents underpin the plant's antioxidant, anti-inflammatory, and antimicrobial activities.
Is there clinical trial evidence supporting Oroxylum indicum supplementation?
No human clinical trials have been published for Oroxylum indicum; all available evidence is limited to in vitro laboratory studies and phytochemical characterization. Preclinical data demonstrate antioxidant activity (dose-dependent radical scavenging in stem bark ethanol extracts) and antimicrobial effects against P. aeruginosa and B. subtilis, but these findings cannot be directly extrapolated to human therapeutic outcomes without controlled clinical investigation.
What is the recommended dose of Oroxylum indicum extract?
No standardized supplemental dose for Oroxylum indicum has been established in clinical trials; dosing guidance does not currently exist for human use. Traditional Burmese preparations typically involve decoctions of approximately 5–10 grams of dried stem bark, but this is based solely on ethnomedicinal practice and has not been validated through pharmacokinetic or dose-response studies in humans.
Is Oroxylum indicum safe to take, and does it interact with medications?
Formal human safety data for Oroxylum indicum are absent, making it impossible to establish a confirmed safe dose or comprehensive interaction profile. The flavonoid baicalein, a major constituent, has demonstrated preclinical inhibitory effects on CYP1A2, CYP2C9, and CYP3A4 liver enzymes, raising theoretical concerns for interactions with drugs including warfarin, phenytoin, and cyclosporine; use during pregnancy or lactation is not recommended due to insufficient safety data.
How does Oroxylum indicum compare to other herbal antioxidants in terms of free radical scavenging ability?
Oroxylum indicum stem bark exhibits dose-dependent free radical scavenging and metal-chelating activity in vitro, with antioxidant capacity measured as quercetin equivalents. While direct comparative studies are limited, its flavonoid profile—particularly baicalein and chrysin—places it among phenolic-rich botanicals, though the magnitude of benefit relative to other established antioxidant herbs requires head-to-head clinical research. In vitro assays demonstrate significant reducing power and total antioxidant capacity, but translation to human bioavailability and efficacy differs from test-tube findings.
What is the most bioavailable form of Oroxylum indicum, and does extraction method affect its activity?
Oroxylum indicum is typically prepared as a stem bark ethanol extract to concentrate its bioactive flavonoids like baicalein, oroxylin A, and chrysin. Ethanol extraction has demonstrated superior capture of phenolic compounds compared to aqueous methods in research settings, supporting its use in standardized supplements. However, human bioavailability studies comparing different extraction methods or formulation approaches (powder vs. extract vs. liquid) are not well-documented in the scientific literature.
Which populations may benefit most from Oroxylum indicum supplementation based on its antioxidant and anti-inflammatory properties?
Oroxylum indicum may be of interest to individuals seeking herbal antioxidant and anti-inflammatory support, particularly those influenced by its traditional use in Ayurvedic and Southeast Asian medicine for respiratory and digestive health. However, specific populations most likely to benefit—such as those with oxidative stress-related conditions or specific inflammatory markers—have not been clearly defined through clinical trials. Current evidence is primarily limited to in vitro antioxidant assays and traditional use patterns rather than targeted clinical outcomes in specific patient groups.
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