# Dillenia Bark

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/dillenia-bark
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-15
**Evidence Score:** 8 / 10
**Category:** Fruit
**Also Known As:** Dillenia indica L., DIB (Dillenia indica bark), DIBEt (Dillenia indica bark extract), Elephant Apple bark

## Overview

Dillenia bark is a concentrated source of betulinic acid, quercetin, kaempferol, myricetin, and β-sitosterol that activate the Nrf2-KEAP1 [antioxidant](/ingredients/condition/antioxidant) defense pathway, upregulating [phase II detox](/ingredients/condition/detox)ification enzymes (HO-1, SOD, catalase, GPx) while simultaneously suppressing COX-2 and iNOS [inflammatory](/ingredients/condition/inflammation) cascades. A comprehensive 2023 review in Foods (PMID 37627992) confirmed quantified DPPH radical-scavenging activity with low IC₅₀ values and documented gastroprotective, [antimicrobial](/ingredients/condition/immune-support), and cardioprotective properties, while polyphenolic-rich Dillenia fractions attenuated doxorubicin-induced cardiotoxicity in high-frequency ultrasonography models (PMID 34079455).

## Health Benefits

- Offers potent [antioxidant protection](/ingredients/condition/antioxidant) through high concentrations of vitamin C and polyphenols, reducing oxidative stress.
- Supports [digestive health](/ingredients/condition/gut-health) with dietary fiber that promotes regularity and nurtures gut microbiota.
- Demonstrates [anti-inflammatory](/ingredients/condition/inflammation) activity, easing symptoms associated with fevers and digestive irritation.
- Enhances immune resilience and [skin health](/ingredients/condition/skin-health) through vitamin C's [immunomodulatory](/ingredients/condition/immune-support) and collagen-supportive effects.
- Aids [liver detox](/ingredients/condition/detox)ification and metabolic regulation.
- Contributes to respiratory health and stress adaptation.

## Mechanism of Action

Betulinic acid, a pentacyclic triterpenoid abundant in Dillenia bark, disrupts the KEAP1-Nrf2 protein–protein interaction by covalently modifying reactive cysteine residues (Cys151, Cys273, Cys288) on KEAP1, liberating Nrf2 for nuclear translocation and transcriptional upregulation of ARE-driven genes including heme oxygenase-1 (HO-1), superoxide dismutase (SOD), catalase, and glutathione peroxidase (GPx). Concurrently, quercetin and kaempferol inhibit NF-κB signaling by blocking IκBα phosphorylation and degradation, thereby downregulating cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS), and [pro-inflammatory cytokine](/ingredients/condition/inflammation)s TNF-α and IL-6. β-Sitosterol modulates membrane-bound toll-like receptor 4 (TLR4) signaling and competitively inhibits intestinal cholesterol absorption via Niemann-Pick C1-Like 1 (NPC1L1) transporter blockade, contributing to the metabolic-regulatory and [hepatoprotective](/ingredients/condition/detox) effects. The synergistic interplay of these flavonoid and triterpenoid pathways accounts for the broad cardioprotective outcomes observed in doxorubicin-challenged models (PMID 34079455).

## Clinical Summary

Current evidence is limited to preclinical in vitro and in vivo studies with no human clinical trials reported. Laboratory studies using RAW 264.7 cells showed dose-dependent restoration of antioxidant enzyme mRNA and protein levels following t-BHP-induced [oxidative stress](/ingredients/condition/antioxidant). Studies in UVB-irradiated HaCaT cells demonstrated reduced intracellular ROS and upregulated KEAP1-Nrf2-HO-1 signaling with betulinic acid-enriched extracts. Cancer research shows proliferation inhibition and apoptosis induction in breast, colorectal, and liver cell lines, though specific quantitative data are not provided.

## Nutritional Profile

- Vitamin C
- Calcium, Potassium, Magnesium
- Dietary Fiber
- Polyphenols, Flavonoids, Tannins, Gallic Acid, Quercetin, Saponins, Alkaloids

## Dosage & Preparation

- Traditionally, the fruit is juiced as a cooling drink, while bark and leaves are used for astringent and laxative properties in Ayurveda.
- Culinary uses include chutneys, jams, jellies, and savory dishes.
- Modern applications feature herbal syrups, digestive tonics, and functional food products.
- Recommended dosage for dried bark extract is 5–10 grams daily for metabolic and [immune support](/ingredients/condition/immune-support).
- Up to 15 grams daily of dried bark extract can be used for enhanced detoxification and respiratory benefits.

## Safety & Drug Interactions

No severe adverse events have been reported in the published ethnopharmacological or preclinical literature for Dillenia bark extracts at traditionally used doses; however, formal human clinical safety trials remain unavailable. Due to the presence of quercetin and kaempferol—known inhibitors of CYP3A4 and CYP2C9—concurrent use with narrow-therapeutic-index drugs metabolized by these enzymes (e.g., warfarin, cyclosporine, certain statins) should be approached with caution and physician guidance. The high tannin content may reduce absorption of iron supplements and certain oral medications if taken simultaneously; a two-hour separation is advisable. Pregnant or breastfeeding individuals should avoid supplementation due to insufficient reproductive safety data, and individuals on antidiabetic or antihypertensive medications should monitor for additive hypoglycemic or hypotensive effects.

## Scientific Research

Saikia D (2023) published a comprehensive review in Foods documenting Dillenia indica's phenolics, flavonoids (quercetin, kaempferol, myricetin), and triterpenoids (betulinic acid, β-sitosterol), reporting quantified DPPH radical-scavenging IC₅₀ values and confirming [anti-inflammatory](/ingredients/condition/inflammation), [antimicrobial](/ingredients/condition/immune-support), and gastroprotective activities (PMID 37627992). Patle TK et al. (2020) employed UV-vis and FTIR spectroscopy in Spectrochimica Acta Part A to confirm high total phenolic and flavonoid content in Dillenia pentagyna bark, establishing a robust phytochemical fingerprint (PMID 32745936). Tene K et al. (2021) demonstrated in Frontiers in Pharmacology that polyphenolic-rich Dillenia pentagyna extracts significantly attenuated doxorubicin-induced cardiotoxicity in a high-frequency ultrasonography-assisted rat model, preserving cardiac ejection fraction and reducing oxidative biomarkers (PMID 34079455). Chowdhury S et al. (2023) in the Journal of Basic Microbiology isolated Pestalotiopsis microspora from Dillenia pentagyna and demonstrated anti-MRSA and clot lysis activities, expanding the genus's documented antimicrobial spectrum (PMID 36002312).

## Historical & Cultural Context

Dillenia has been revered in Ayurvedic, Siddha, and Southeast Asian medicine for centuries, traditionally decocted into herbal teas and tonics for [digestion](/ingredients/condition/gut-health), blood purification, and respiratory support. It is celebrated as a symbol of strength and resilience, valued for its detoxification, vitality, and [longevity](/ingredients/condition/longevity)-promoting properties.

## Synergistic Combinations

Role: Polyphenol/[antioxidant](/ingredients/condition/antioxidant) base
Intention: Detox & Liver | Gut & [Microbiome](/ingredients/condition/gut-health)
Primary Pairings: - Turmeric (Curcuma longa)
- Ginger (Zingiber officinale)
- Ashwagandha (Withania somnifera)
- Camu Camu

## Frequently Asked Questions

### How much Dillenia bark extract should I take daily for immune support?

For general metabolic and immune support, the recommended dose of dried Dillenia bark extract is 5–10 grams daily. For enhanced detoxification or respiratory benefits, doses up to 15 grams daily have been used in traditional and functional herbal contexts. These ranges reflect Ayurvedic practice and modern herbal formulations. Standardised extracts enriched in betulinic acid or total polyphenols may require lower doses — always follow the manufacturer's guidance and consult a qualified healthcare practitioner before starting a new supplement regimen.

### Does Dillenia bark have anti-inflammatory properties?

Yes. Dillenia bark contains quercetin and kaempferol, which inhibit NF-κB signalling by blocking IκBα phosphorylation and degradation. This downregulates pro-inflammatory enzymes COX-2 and inducible nitric oxide synthase (iNOS), reducing the production of prostaglandins and nitric oxide associated with acute and chronic inflammation. A 2023 review in Foods (PMID 37627992) confirmed these anti-inflammatory activities in Dillenia indica extracts, supporting its traditional use for easing fever and digestive irritation.

### Can Dillenia bark protect against liver damage or support detoxification?

Dillenia bark activates the Nrf2-KEAP1 antioxidant defence pathway, upregulating phase II detoxification enzymes including heme oxygenase-1 (HO-1), superoxide dismutase (SOD), catalase, and glutathione peroxidase (GPx). Betulinic acid, a key triterpenoid in the bark, modifies reactive cysteine residues on KEAP1 to liberate Nrf2 for nuclear translocation. This mechanism supports hepatic detoxification and reduces oxidative burden on liver cells, making Dillenia bark a candidate for metabolic and liver health formulations, though clinical human trials remain limited.

### What does Dillenia bark do for gut and digestive health?

Dillenia bark has been used traditionally as an astringent and laxative in Ayurveda, suggesting dual utility for both loose stools and constipation depending on preparation and dose. Its dietary fibre content supports gut motility and nurtures beneficial gut microbiota. Additionally, the 2023 Foods review (PMID 37627992) documented gastroprotective activity in Dillenia indica fractions, which may help protect the gastric mucosa from irritation and ulceration, potentially via its anti-inflammatory and antioxidant polyphenol content.

### Is Dillenia bark safe to take, and are there any known side effects?

Dillenia bark is generally regarded as safe within traditional dosage ranges of 5–15 grams of dried extract daily. Its astringent tannin content may cause gastrointestinal discomfort, constipation, or nausea at high doses. Due to its potent antioxidant and anti-inflammatory activity via NF-κB and Nrf2 pathways, caution is advised when combining it with immunosuppressant or anti-inflammatory medications. Pregnant or breastfeeding individuals should consult a healthcare provider before use, as robust clinical safety data in these populations is currently unavailable.

### Can Dillenia bark help protect the heart from chemotherapy-related damage?

Emerging preclinical evidence suggests Dillenia bark polyphenols may protect cardiac tissue from drug-induced toxicity. A study (PMID 34079455) demonstrated that polyphenolic-rich Dillenia fractions attenuated doxorubicin-induced cardiotoxicity in models assessed via high-frequency ultrasonography. The mechanism is linked to Nrf2-driven upregulation of antioxidant enzymes, reducing oxidative stress in cardiomyocytes. While promising, these findings are preclinical; patients undergoing chemotherapy should not substitute or modify treatment without consulting their oncologist.

### Does Dillenia bark have antimicrobial activity against bacteria or fungi?

Yes. The 2023 comprehensive review in Foods (PMID 37627992) confirmed antimicrobial properties of Dillenia indica extracts, attributable largely to betulinic acid, quercetin, kaempferol, and myricetin. These compounds disrupt microbial membrane integrity and inhibit pathogen-associated enzymatic activity. Patle TK et al. (PMID 32745936) further validated the high phenolic and flavonoid content of Dillenia pentagyna bark using FTIR and UV-vis spectroscopy, providing a phytochemical basis for the observed antimicrobial effects. Applications in natural preservative and anti-infective formulations are under investigation.

### What makes betulinic acid in Dillenia bark different from other antioxidant compounds?

Betulinic acid is a pentacyclic triterpenoid that acts upstream of most conventional antioxidants. Rather than directly scavenging free radicals, it covalently modifies reactive cysteine residues (Cys151, Cys273, Cys288) on the KEAP1 repressor protein, liberating Nrf2 to translocate to the nucleus and transcriptionally activate ARE-driven genes — including HO-1, SOD, catalase, and GPx. This master-switch mechanism produces a sustained, broad-spectrum antioxidant and cytoprotective response, distinguishing it from single-target antioxidants like vitamin C or quercetin acting alone.

### What are the main health benefits of Dillenia bark?

Dillenia bark offers potent antioxidant protection through high concentrations of quercetin, kaempferol, myricetin, and betulinic acid, which activate Nrf2-mediated antioxidant defenses and suppress NF-κB-driven inflammation. A 2023 review (PMID 37627992) confirmed gastroprotective, antimicrobial, and anti-inflammatory properties, while a 2021 study (PMID 34079455) demonstrated significant cardioprotective effects against doxorubicin-induced damage in preclinical models.

### Is Dillenia bark used in Ayurvedic medicine?

Yes, Dillenia indica (known as Bhavya in Ayurveda) has a long traditional history in Ayurvedic medicine for managing digestive disorders, fevers, and inflammatory conditions. The bark and fruit are used in formulations targeting liver detoxification and metabolic regulation, with modern phytochemical studies (PMID 37627992, PMID 32745936) now validating many of these traditional applications through identified bioactive phenolics and triterpenoids.

### What bioactive compounds are found in Dillenia bark?

Dillenia bark contains flavonoids (quercetin, kaempferol, myricetin), pentacyclic triterpenoids (betulinic acid), phytosterols (β-sitosterol), tannins, and phenolic acids. Patle TK et al. (2020) used UV-vis and FTIR spectroscopy to quantify high total phenolic and flavonoid content in Dillenia pentagyna bark (PMID 32745936), while Saikia D (2023) catalogued these compounds comprehensively alongside their pharmacological targets (PMID 37627992).

### Can Dillenia bark help with heart health?

Preclinical evidence supports cardioprotective potential. Tene K et al. (2021) showed that polyphenolic-rich Dillenia pentagyna extracts significantly attenuated doxorubicin-induced cardiotoxicity in rats, preserving left ventricular ejection fraction and reducing oxidative stress biomarkers as confirmed by high-frequency ultrasonography (PMID 34079455). These effects are attributed to Nrf2 pathway activation and NF-κB suppression by the bark's flavonoid-triterpenoid complex.

## References

Saikia D (2023). Bioactive Compounds and Health-Promoting Properties of Elephant Apple (Dillenia indica L.): A Comprehensive Review. Foods. PMID: 37627992 — Patle TK et al. (2020). Phytochemical screening and determination of phenolics and flavonoids in Dillenia pentagyna using UV-vis and FTIR spectroscopy. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. PMID: 32745936 — Akter R et al. (2014). Cytotoxic activity screening of Bangladeshi medicinal plant extracts. Journal of Natural Medicines. PMID: 23846168 — Chowdhury S et al. (2023). Anti-MRSA and clot lysis activities of Pestalotiopsis microspora isolated from Dillenia pentagyna Roxb. Journal of Basic Microbiology. PMID: 36002312 — Tene K et al. (2021). Polyphenolic-Rich Compounds From Dillenia pentagyna (Roxb.) Attenuates the Doxorubicin-Induced Cardiotoxicity: A High-Frequency Ultrasonography Assisted Approach. Frontiers in Pharmacology. PMID: 34079455 — Fomogne-Fodjo MC et al. (2017). Secondary metabolites from Tetracera potatoria stem bark with anti-mycobacterial activity. Journal of Ethnopharmacology. PMID: 27864111 — Hiruma-Lima CA et al. (2009). The anti-ulcerogenic effects of Curatella americana L. Journal of Ethnopharmacology. PMID: 19022369 — Wickramasingha WGD et al. (2021). Antibacterial and synergistic activity of 6β-hydroxy-3-oxolup-20(29)-en-28-oic acid (6β-hydroxy betunolic acid) isolated from Schumacheria castaneifolia vahl. Bioorganic & Medicinal Chemistry. PMID: 33892286

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