Hermetica Superfood Encyclopedia
The Short Answer
Azadirachta excelsa contains limonoids (including nimbolide and 6-deacetylnimbin), polyphenols, flavonoids, and fatty acid-rich volatile fractions that collectively mediate antioxidant free-radical scavenging, antibacterial membrane disruption, and putative vasodilatory or ACE-inhibitory effects. In the most clinically relevant preclinical study identified, oral administration of 250 mg/kg ethanolic leaf extract reduced systolic blood pressure in spontaneously hypertensive rats from 187 mmHg to 153 mmHg (P<0.05), an effect comparable to 40 mg/kg captopril.
CategoryHerb
GroupSoutheast Asian
Evidence LevelPreliminary
Primary KeywordAzadirachta excelsa benefits
Sentang — botanical close-up
Health Benefits
**Antihypertensive Activity**
Ethanolic leaf extract at 250 mg/kg significantly reduced systolic blood pressure in spontaneously hypertensive rats (187 → 153 mmHg, P<0.05), likely via phenolic-mediated vasodilation or angiotensin-converting enzyme inhibition analogous to captopril's mechanism.
**Antioxidant Protection**
Leaf extracts demonstrate high total phenolic content (202 ± 0.42 mg gallic acid equivalents/g) and total flavonoid content (198 ± 0.67 mg rutin equivalents/g), achieving free radical scavenging with an IC50 of 308 μg/ml in vitro, suggesting protection against oxidative cellular damage.
**Antibacterial Action**
Chloroform leaf/stem extracts produce inhibition zones of 12.37–17.20 mm against Staphylococcus aureus and 13.88–15.89 mm against Escherichia coli, attributed to terpenoids and flavonoids disrupting bacterial membrane integrity.
**Anti-termite and Insecticidal Properties**
Seed kernel extracts rich in limonoids such as nimbolide and nimbolidin C demonstrate feeding deterrence against termites, likely through disruption of insect ecdysteroid hormone signaling pathways shared with Indian neem limonoids.
**Anti-inflammatory Potential (Inferred)**
The high flavonoid and phenylpropanoid content, combined with known limonoid constituents common to the Azadirachta genus, suggests inhibition of pro-inflammatory mediators including cyclooxygenase and lipoxygenase enzymes, though direct evidence in A. excelsa remains unpublished.
**Skin Disease Applications (Traditional)**
In Malaysian ethnomedicine, leaf preparations are used topically and internally for skin conditions including eczema, fungal infections, and inflammatory dermatoses, consistent with the antibacterial and antioxidant phytochemical profile documented analytically.
**Antipyretic Use (Traditional)**
Leaf decoctions are traditionally administered for fever management in Malaysia, consistent with the anti-inflammatory limonoid content and paralleling the well-documented antipyretic activity of A. indica across the same Meliaceae family.
Origin & History
Natural habitat
Azadirachta excelsa is native to Southeast Asia, distributed across Malaysia, Indonesia, Thailand, and the Philippines, where it grows in lowland and coastal tropical forests up to approximately 600 meters elevation. It thrives in well-drained sandy or loamy soils under humid tropical conditions and is frequently found in secondary forests, roadsides, and cultivated plantations as a timber and shade tree. Unlike its congener Azadirachta indica (Indian neem), it is not extensively cultivated for commercial medicinal purposes, though it is harvested opportunistically from wild or semi-wild populations across the Malay Archipelago.
“Azadirachta excelsa, known locally as 'sentang' in Malaysia and parts of Indonesia, occupies a role in Southeast Asian ethnomedicine analogous to—though considerably less documented than—Indian neem (A. indica) in South Asian traditions. In Malaysian traditional healing systems, sentang leaves and bark have been used in decoctions for the management of skin diseases including fungal infections and inflammatory dermatoses, as well as for febrifuge (fever-reducing) purposes, with preparations typically involving boiling fresh or dried plant material in water. The tree is also valued regionally as a timber species and for agroforestry purposes, and in parts of the Malay Archipelago it is planted near dwellings partly for its perceived protective and medicinal properties, paralleling the sacred-tree status of neem in Indian culture. Formal documentation of its ethnopharmacological use in classical Malay herbalist texts (bomoh traditions) remains limited in peer-reviewed literature, and much knowledge persists in oral tradition rather than written pharmacopeial records.”Traditional Medicine
Scientific Research
The scientific evidence base for Azadirachta excelsa is sparse and entirely preclinical, comprising a small number of in vitro bioassays and one animal pharmacology study identified in the accessible literature, with no human clinical trials registered or published as of the current review. The most robust pharmacological study employed spontaneously hypertensive rats (SHR) divided into four experimental groups receiving oral ethanolic leaf extract at 250 mg/kg, demonstrating statistically significant (P<0.05) reduction of systolic blood pressure to 153 mmHg compared to 187 mmHg in untreated controls, with efficacy approximating 40 mg/kg captopril as the positive control. Phytochemical characterization studies using GC-MS identified 47 components in n-hexane seed kernel extracts (major: 9,12,15-octadecatrienoic acid at 42.34%; pentadecanoic acid 14-methyl-methyl ester at 28.99%) and 30 components in methanol extracts (major: patchouli alcohol 28.1%; delta-guaiene 15.15%), while LC-MS confirmed limonoid presence including nimbolide and 6-deacetylnimbin, providing phytochemical credibility but no efficacy data. Antibacterial disk-diffusion assays against S. aureus and E. coli confirmed activity with chloroform extracts, but the absence of MIC/MBC determination, mechanism studies, in vivo infection models, and any toxicokinetic data substantially limits clinical translation of all findings.
Preparation & Dosage
Traditional preparation
**Ethanolic Leaf Extract (Preclinical Reference Dose)**
250 mg/kg body weight administered orally in rat models; no human equivalent dose has been validated or established
**Traditional Leaf Decoction**
Leaves boiled in water and consumed as a tea for fever and skin conditions in Malaysian folk medicine; no standardized preparation volume or concentration documented.
**Topical Leaf Paste**
Fresh or dried leaves ground and applied directly to skin lesions for antimicrobial and anti-inflammatory effects; frequency and duration unstandardized.
**Seed Kernel Oil/Extract**
n-Hexane or methanol extraction studied analytically for phytochemical profiling; no therapeutic dose established for human use.
**Chloroform Leaf Extract**
Used in antibacterial research assays; not formulated for human consumption due to solvent residue concerns.
**Standardization**
No commercial standardization exists; no minimum thresholds for nimbolide, total phenolics, or flavonoids have been established for therapeutic preparations.
**Timing and Administration Notes**
All preclinical data are from acute or short-term oral models; optimal dosing frequency, duration, and food-interaction effects are entirely unknown.
Nutritional Profile
Azadirachta excelsa has not been characterized as a food or nutritional ingredient, and no macronutrient, micronutrient, or caloric data have been reported in the available literature. From a phytochemical standpoint, seed kernels are particularly rich in polyunsaturated fatty acids, with 9,12,15-octadecatrienoic acid (alpha-linolenic acid equivalent) comprising approximately 42.34% of the n-hexane extractable fraction and 9,12-octadecadienoic acid (linoleic acid) at 16.31%, suggesting a seed oil profile with omega-3 and omega-6 fatty acids. Leaves contain high concentrations of phenolic compounds (202 mg GAE/g dry extract) and flavonoids (198 mg RE/g dry extract), among the higher values reported for Meliaceae species, alongside limonoid terpenoids including nimbolide and 6-deacetylnimbin. The methanol seed kernel fraction is dominated by sesquiterpene alcohols (patchouli alcohol 28.1%; delta-guaiene 15.15%; alpha-guaiene 11.93%), which contribute to aromatic properties but have limited nutritional significance; bioavailability of all constituents in humans remains unstudied.
How It Works
Mechanism of Action
The primary bioactive limonoids of A. excelsa, including nimbolide and 6-deacetylnimbin identified by LC-MS in seed kernel extracts, are tetranortriterpenoids that in related species inhibit NF-κB signaling and disrupt insect juvenile hormone pathways, though direct receptor-binding studies for A. excelsa have not been conducted. Leaf phenolics and flavonoids (TPC 202 mg GAE/g; TFC 198 mg RE/g) exert antioxidant effects through direct hydrogen-atom transfer and electron-donation to reactive oxygen species, with IC50 of 308 μg/ml in DPPH assays, and may inhibit xanthine oxidase and NADPH oxidase enzymatic oxidant production. The antihypertensive effect observed in spontaneously hypertensive rat models is mechanistically hypothesized to involve phenolic inhibition of angiotensin-converting enzyme or endothelin-1-mediated vasoconstriction, by analogy with structurally related polyphenols in Meliaceae species, though ACE inhibition assays have not been directly performed for A. excelsa extracts. The antibacterial activity of chloroform-soluble fractions, dominated by terpenoids and lipophilic flavonoids, likely involves disruption of bacterial phospholipid bilayer integrity and inhibition of bacterial DNA gyrase, consistent with the membrane-active properties documented for terpenoid-rich neem extracts against both Gram-positive S. aureus and Gram-negative E. coli.
Clinical Evidence
No human clinical trials have been conducted on Azadirachta excelsa for any indication, leaving the clinical evidence base entirely dependent on preclinical animal and in vitro studies of limited methodological rigor. The most significant preclinical finding is a blood pressure reduction of approximately 34 mmHg systolic in spontaneously hypertensive rats at 250 mg/kg oral ethanolic leaf extract, an effect size that is pharmacologically meaningful but cannot be directly extrapolated to human dosing without pharmacokinetic bridging studies. Antioxidant and antibacterial assays provide supportive mechanistic plausibility for traditional uses in skin disease and infection, but inhibitory concentrations (IC50 308 μg/ml for DPPH; zone inhibition diameters of 12–17 mm) have not been validated in infection or disease models. Overall confidence in clinical efficacy for any indication is very low, and the ingredient should be considered at an exploratory preclinical stage requiring Phase I safety studies before any therapeutic claims can be substantiated.
Safety & Interactions
No formal toxicological studies, maximum tolerated dose determinations, or human safety data have been published specifically for Azadirachta excelsa, representing a significant gap that precludes definitive safety characterization. By analogy with its closely related congener Azadirachta indica, potential adverse effects may include gastrointestinal disturbances (nausea, vomiting, diarrhea) at high doses, and the limonoid constituents common to the genus—including nimbolide—have demonstrated abortifacient and antifertility effects in animal models, warranting contraindication in pregnancy and caution during lactation until species-specific reproductive toxicity data are available. The documented antihypertensive effect (34 mmHg systolic reduction at 250 mg/kg in rats) creates a plausible additive hypotension risk when co-administered with antihypertensive drug classes including ACE inhibitors, beta-blockers, calcium channel blockers, and diuretics, necessitating blood pressure monitoring if used concurrently. No drug metabolism (CYP450) interaction data exist for A. excelsa; however, the high polyphenol content raises theoretical concern for interactions with anticoagulants (warfarin) and drugs with narrow therapeutic indices, and use should be avoided without medical supervision until evidence is available.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Azadirachta excelsa (Jack) M.R.JacobsSentangThai neemParadisenbaumAzadirachta excelsa (Sentang)IntaranMalay neem
Frequently Asked Questions
What is Azadirachta excelsa used for medicinally?
In Malaysian and Indonesian traditional medicine, Azadirachta excelsa (sentang) is used primarily to treat skin diseases such as fungal infections and inflammatory dermatoses, and as a febrifuge for fever management. Preclinical research additionally supports antihypertensive, antioxidant, and antibacterial activities, though no human clinical trials have confirmed these effects in people.
How does Azadirachta excelsa lower blood pressure?
In a preclinical study using spontaneously hypertensive rats, oral administration of 250 mg/kg ethanolic leaf extract reduced systolic blood pressure from 187 mmHg to 153 mmHg (P<0.05), an effect comparable to the ACE inhibitor captopril at 40 mg/kg. The mechanism is hypothesized to involve phenolic inhibition of angiotensin-converting enzyme or direct vasodilation, though ACE inhibition assays have not yet been directly conducted for this species.
What bioactive compounds are found in Azadirachta excelsa?
Key bioactive compounds include limonoids identified by LC-MS (nimbolide, 6-deacetylnimbin, nimbolidin C), polyunsaturated fatty acids in seed kernels (alpha-linolenic acid at ~42% of hexane fraction), sesquiterpene alcohols including patchouli alcohol (28.1% of methanol fraction), and leaf polyphenols with total phenolic content of 202 mg gallic acid equivalents/g and total flavonoids of 198 mg rutin equivalents/g. These compound classes collectively underpin the antimicrobial, antioxidant, and antihypertensive bioactivities reported in preclinical studies.
Is Azadirachta excelsa safe to use during pregnancy?
No specific reproductive safety data exist for Azadirachta excelsa, but the limonoid compounds it shares with its congener Azadirachta indica have demonstrated abortifacient and antifertility effects in animal models, making use during pregnancy inadvisable. Until species-specific reproductive toxicology studies are completed, pregnant and breastfeeding individuals should avoid preparations of A. excelsa entirely.
How does Azadirachta excelsa differ from regular neem (Azadirachta indica)?
Both species belong to the Meliaceae family and share overlapping phytochemical profiles including limonoids, flavonoids, and terpenoids, but Azadirachta excelsa is native to Southeast Asia (Malaysia, Indonesia, Thailand) rather than South Asia, and has received far less scientific and commercial attention than A. indica. While Indian neem has hundreds of published studies and established applications in agriculture and medicine, A. excelsa has only a handful of preclinical phytochemical and pharmacology studies, and no standardized extracts or clinical dose guidelines exist for it.
What is the recommended dosage of Azadirachta excelsa for blood pressure management?
Clinical studies showing antihypertensive effects in rats used ethanolic leaf extract at 250 mg/kg, but human equivalent dosing has not been established in published trials. Most traditional preparations use leaf decoctions or standardized extracts, though specific dosage recommendations for humans are lacking in peer-reviewed literature. Consultation with a healthcare provider is essential before using Azadirachta excelsa for blood pressure, as optimal human dosing remains undetermined.
Does Azadirachta excelsa interact with blood pressure medications like ACE inhibitors?
Azadirachta excelsa may have ACE inhibitor-like activity based on mechanisms observed in animal studies, raising the potential for additive effects when combined with prescription antihypertensives such as captopril or lisinopril. This theoretical interaction could increase the risk of excessive blood pressure lowering and requires medical monitoring. Users taking ACE inhibitors or other antihypertensive drugs should inform their healthcare provider before using Azadirachta excelsa supplements.
Which form of Azadirachta excelsa—leaf extract, dried leaf, or standardized extract—provides the strongest antioxidant benefits?
Ethanolic leaf extracts demonstrate high total phenolic content (202 ± 0.42 mg gallic acid equivalents per gram) and exhibit superior antioxidant activity compared to whole dried leaf preparations in laboratory assays. Standardized extracts ensuring consistent phenolic concentrations would theoretically offer more reliable bioactivity than unstandardized dried leaves. However, comparative human bioavailability studies between different Azadirachta excelsa preparations have not been published, limiting definitive recommendations.
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