Hermetica Superfood Encyclopedia
The Short Answer
Dongoyaro contains limonoids (azadirachtin, nimbolide, gedunin) and polyphenols (quercetin, rutin at 4150.625 µg/g, catechin at 315.404 µg/g) that modulate NF-κB and MAPK inflammatory pathways, scavenge free radicals, and disrupt microbial and parasitic cell function. In vitro studies demonstrate leaf extract inhibits SARS-CoV-2 replication with an IC50 of 8.541 µg/mL and a selectivity index of 52.8, exceeding the threshold recommended for drug advancement, though no human clinical trials have yet confirmed these effects.
CategoryHerb
GroupAfrican
Evidence LevelPreliminary
Primary Keyworddongoyaro benefits
Dongoyaro — botanical close-up
Health Benefits
**Antimalarial Activity**
Limonoids including gedunin and nimbolide interfere with Plasmodium falciparum development by disrupting heme detoxification and parasite protein synthesis, providing a mechanistic basis for the centuries-old Yoruba and Hausa use of leaf decoctions to manage malaria fever.
**Antiviral Potential**
Ethanolic leaf extract inhibits SARS-CoV-2 replication in Vero E6 cell models at an IC50 of 8.451–8.541 µg/mL, with a cytotoxic concentration (CC50) of 446.2 µg/mL, yielding a selectivity index of 52.8 that surpasses the >50 benchmark for lead compound advancement.
**Antibacterial Action**
Limonoids and polyphenols exhibit minimum inhibitory concentrations of 25–100 µg/mL against both Gram-positive and Gram-negative bacterial strains within 30 minutes of exposure, disrupting bacterial cell wall integrity and membrane function.
**Anti-inflammatory Effects**
Nimbolide and azadirachtin suppress proinflammatory cytokines TNF-α and IL-6 by downregulating NF-κB and MAPK signaling cascades, reducing systemic inflammation associated with infections, skin conditions, and metabolic disease.
**Antioxidant Protection**: High rutin content (4150
625 µg/g) alongside quercetin and catechin scavenges reactive oxygen species, upregulates endogenous antioxidant enzymes (superoxide dismutase, catalase), and inhibits lipid peroxidation as demonstrated in multiple in vitro assays.
**Immunomodulatory Support**
Bioactive limonoids elevate CD4+ and CD8+ T-lymphocyte populations and modulate innate immune responses, suggesting potential utility in supporting host defense against chronic or recurrent infections.
**Wound Healing and Skin Health**
Tannins and terpenoids in leaf and bark preparations promote tissue regeneration, inhibit secondary bacterial infection at wound sites, and reduce dermal inflammation, consistent with traditional topical application of leaf pastes across West Africa.
Origin & History
Natural habitat
Azadirachta indica is native to the Indian subcontinent but has been widely naturalized across sub-Saharan Africa, Southeast Asia, and tropical regions worldwide, thriving in semi-arid to tropical climates with well-drained soils and high heat tolerance. In West Africa, particularly Nigeria, it is called 'Dongoyaro' (meaning 'tall boy' in Hausa, referencing its height) and grows abundantly as a roadside and village tree. The tree is drought-resistant, grows at altitudes up to 700 meters, and is cultivated both for shade and as a medicinal resource, with leaves, bark, seeds, and oil all harvested for traditional use.
“Azadirachta indica has been used therapeutically for over 4,000 years in Ayurvedic medicine, where it is called 'Nimba' and described in classical Sanskrit texts such as the Charaka Samhita as a bitter tonic for purifying blood, treating skin disorders, and managing febrile illness. Introduced to West Africa during historical trade and migration routes, the tree became deeply integrated into Yoruba and Hausa healing traditions in Nigeria under the name 'Dongoyaro,' where it is one of the most frequently cited plants in ethnobotanical surveys of antimalarial herbs. Traditional healers prepare leaf decoctions, bark teas, and seed oil preparations for conditions ranging from malaria and typhoid fever to skin infections, oral hygiene (chewing sticks), and gastrointestinal complaints, reflecting a comprehensive pharmacopoeia built on centuries of empirical observation. The United Nations has recognized neem's global traditional importance, and in Nigeria it remains an accessible, low-cost botanical medicine particularly in rural communities with limited access to pharmaceutical antimalarials.”Traditional Medicine
Scientific Research
The body of evidence for Dongoyaro (Azadirachta indica) consists predominantly of in vitro cell-culture studies and animal model experiments, with no peer-reviewed randomized controlled trials (RCTs) in human populations identified in the current literature. In vitro antiviral research using Vero E6 cells demonstrated a SARS-CoV-2 IC50 of 8.541 µg/mL and a selectivity index of 52.8, results that are statistically robust at the cellular level but cannot be directly extrapolated to human dosing or clinical outcomes. Antibacterial studies report MIC values of 25–100 µg/mL against common pathogens, and phytochemical profiling via HPLC has reliably quantified key compounds such as rutin (4150.625 µg/g) and catechin (315.404 µg/g) in leaf extracts. The overall evidence base is preclinical in nature; while mechanistically compelling, the absence of Phase I/II human trials means efficacy and optimal dosing for any therapeutic indication remain scientifically unvalidated.
Preparation & Dosage
Traditional preparation
**Leaf Decoction (Traditional)**
10–20 g of fresh or dried leaves in 500 mL water for 15–20 minutes, strain, and consume 1–2 cups daily; this is the most common Yoruba and Hausa preparation for fever and malaria management, though dose is not clinically validated
Boil .
**Dried Leaf Powder**
1–2 g per day in divided doses; no standardized pharmaceutical dose established from RCTs
Traditional use suggests approximately .
**Ethanolic/Methanolic Extract**
Used in research and nutraceutical formulations; effective concentrations in vitro range from 8–100 µg/mL depending on target organism, but human equivalent doses have not been established.
**Neem Oil (Seed Cold-Press)**
5–10 mL/day) for internal use; oral consumption of undiluted oil carries toxicity risk and is not recommended without medical supervision
Applied topically for skin conditions or consumed in very small amounts (historically .
**Standardized Supplements**
300–500 mg extract twice daily, but clinical evidence for these doses is absent
Commercial neem capsules often standardized to 0.3–2% azadirachtin or total limonoid content; typical label doses range from .
**Timing Notes**
Leaf decoctions traditionally taken on an empty stomach in the morning for antimalarial use; topical paste applied twice daily to affected skin areas.
Nutritional Profile
Neem leaves contain significant polyphenol concentrations including rutin (4150.625 µg/g), catechin (315.404 µg/g), vanillic acid (151.947 µg/g), chlorogenic acid (99.167 µg/g), protocatechuic acid (59.866 µg/g), and quercetin (38.274 µg/g) as quantified by HPLC in ethanolic extracts. Limonoid terpenoids—azadirachtin, nimbin, nimbolide, gedunin, nimbidin, and salannin—are the dominant therapeutically active compounds, concentrated especially in seeds and oil fractions, though precise mg/g concentrations vary substantially by plant part, geographic origin, and extraction solvent. Secondary metabolites include β-sitosterol, ascorbic acid, n-hexacosanol, saponins (highest in aqueous extracts), tannins, alkaloids, steroids, and glycosides. Bioavailability of limonoids and polyphenols is poorly characterized in humans; lipophilic compounds like azadirachtin likely benefit from oil-based or emulsified formulations, while water-soluble polyphenols are partially absorbed from aqueous decoctions.
How It Works
Mechanism of Action
Azadirachtin and nimbolide inhibit NF-κB nuclear translocation, reducing transcription of proinflammatory cytokine genes (TNF-α, IL-1β, IL-6) and suppressing COX-2-mediated prostaglandin synthesis, while simultaneously activating MAPK-dependent anti-apoptotic pathways in host cells under oxidative stress. Polyphenolic constituents—particularly quercetin and rutin—donate hydrogen atoms to neutralize superoxide and hydroxyl radicals, chelate transition metals that catalyze Fenton reactions, and directly upregulate Nrf2-ARE pathway expression, increasing intracellular glutathione and superoxide dismutase activity. Gedunin and related limonoids disrupt Plasmodium falciparum heat shock protein 90 (PfHsp90) function, impairing parasite protein folding and survival within erythrocytes, which underpins the antimalarial ethnopharmacological claim. Antimicrobial activity occurs through membrane depolarization in bacterial cells and competitive inhibition of viral replication enzymes, as evidenced by the low IC50 values recorded against SARS-CoV-2 in cell-based assays.
Clinical Evidence
No completed human RCTs for Dongoyaro (Azadirachta indica) are documented in accessible peer-reviewed literature, making it impossible to report effect sizes, confidence intervals, or number-needed-to-treat figures from clinical populations. Preclinical antiviral data (IC50 8.541 µg/mL, SI 52.8 vs. SARS-CoV-2) and antimalarial mechanistic data involving PfHsp90 disruption represent the strongest experimental evidence available, both generated in controlled laboratory settings. Traditional ethnopharmacological use across Nigerian Yoruba and Hausa communities—where leaf decoctions are consumed for febrile illness including malaria—provides observational support but lacks the methodological rigor to establish causality or dose-response relationships. Confidence in therapeutic claims remains low to moderate from an evidence-based medicine standpoint; clinical translation is a research priority given the strength of preclinical signals.
Safety & Interactions
Short-term use of leaf extracts at conventional traditional doses is generally considered low-risk based on cytotoxicity data (CC50 >350–446 µg/mL in cell models, SI >50), but systematic human safety studies are absent, and adverse event rates in population use are not formally documented. Neem oil taken orally in doses above 5–10 mL has been associated with toxic encephalopathy and Reye's-like syndrome in children in case reports, and oral neem oil is contraindicated in infants and young children. Potential drug interactions include attenuation of immunosuppressant therapies (cyclosporine, tacrolimus) due to immunomodulatory upregulation of T-cell populations, and theoretical potentiation of antidiabetic drugs given hypoglycemic activity reported in animal studies. Neem preparations are traditionally contraindicated in pregnancy due to reported uterotonic and abortifacient properties inferred from animal studies and ethnopharmacological accounts; use during lactation is likewise not established as safe, and pregnant or breastfeeding individuals should avoid therapeutic doses.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Azadirachta indicaNeemNimtreeIndian LilacDongoyaroNimbaMargosa
Frequently Asked Questions
Does dongoyaro actually work for malaria?
Dongoyaro (neem) contains limonoids such as gedunin and nimbolide that disrupt Plasmodium falciparum's heat shock protein 90 (PfHsp90), impairing parasite survival in red blood cells, which provides a plausible molecular basis for its traditional antimalarial use. However, no human randomized controlled trials have confirmed clinical efficacy or established a therapeutic dose; the evidence currently remains at the preclinical in vitro and animal model stage, so it should not replace proven antimalarial drugs like artemisinin-based combination therapies.
How do you prepare dongoyaro leaf tea?
The traditional Yoruba and Hausa preparation involves boiling 10–20 grams of fresh or dried neem leaves in approximately 500 mL of water for 15–20 minutes, then straining the liquid and consuming 1–2 cups per day, typically on an empty stomach in the morning. No clinically validated dose exists, so this traditional guideline is based on ethnopharmacological documentation rather than controlled trial data.
Is dongoyaro (neem) safe to drink every day?
Short-term consumption of neem leaf decoctions at traditional doses is generally considered low-risk in healthy adults based on in vitro cytotoxicity data showing high selectivity indices (>50) and widespread historical use, but formal human safety studies establishing a maximum safe daily dose do not exist. Oral neem oil is distinctly more hazardous and has caused toxic encephalopathy in children; pregnant women should avoid therapeutic use of any neem preparation due to potential uterotonic effects documented in animal studies.
What is the difference between neem and dongoyaro?
Dongoyaro is the Hausa name for Azadirachta indica, the same tree internationally known as neem or Indian lilac; the name translates roughly to 'tall boy' in reference to the tree's height and is used predominantly in northern Nigeria and across West Africa. The plant, its bioactive compounds (azadirachtin, nimbolide, rutin), and its medicinal applications are botanically and pharmacologically identical regardless of the regional name used.
What are the side effects of taking dongoyaro?
At conventional leaf decoction doses in adults, adverse effects are infrequently reported and the cytotoxic threshold in cell studies is high (CC50 >446 µg/mL), suggesting a reasonable short-term safety margin. Known risks include potential liver stress with prolonged high-dose use (based on animal studies), uterotonic effects contraindicating use in pregnancy, possible interactions with immunosuppressant drugs, and serious toxicity from oral neem oil—especially in infants and children, where encephalopathy cases have been documented.
Can dongoyaro interact with antimalarial medications like artemisinin or chloroquine?
Dongoyaro contains limonoids that work through similar mechanisms to some antimalarial drugs by disrupting parasite heme detoxification, raising theoretical concerns about additive effects or reduced efficacy when combined. Limited clinical data exists on concurrent use with prescription antimalarials, so combining dongoyaro with pharmaceutical antimalarials should only be done under medical supervision to avoid reduced treatment effectiveness or unexpected interactions. If you are taking antimalarial medications, consult your healthcare provider before adding dongoyaro supplementation.
Is dongoyaro safe to use during pregnancy and breastfeeding?
Dongoyaro is traditionally contraindicated during pregnancy due to its bitter principles and potential emmenagogue properties, though human safety data is limited. The concentrated limonoids and active compounds in dongoyaro extracts may pose risks to fetal development, making avoidance advisable during pregnancy and lactation. Pregnant or breastfeeding women should consult a healthcare provider before considering dongoyaro supplementation.
What form of dongoyaro (leaf extract, powder, or standardized supplement) has the strongest research evidence?
Ethanolic leaf extracts and standardized limonoid preparations (gedunin and nimbolide content verified) have the most robust in vitro evidence for antimalarial and antiviral activity in clinical studies. Whole leaf powders and traditional decoctions have historical use evidence but lack standardized active compound levels, making dosing consistency difficult. For research-backed efficacy, standardized extracts with documented limonoid content are preferable to unstandardized leaf powders, though more human clinical trials are needed across all forms.
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