Mesua

Mesua (Mesua ferrea L.): A Comprehensive Reference Article

1. Identity and Botanical Description

1.1 Nomenclature and Taxonomy

Mesua ferrea L., commonly called the Ceylon ironwood or cobra saffron, is a species in the family Calophyllaceae, native to the Indomalayan realm. The scientific name Mesua ferrea was first established by Carl Linnaeus in his seminal work Species Plantarum in 1753, where it was described on page 515 based on earlier herbarium specimens and descriptions originating from Ceylon (modern-day Sri Lanka). It has historically been classified within the family Clusiaceae by some authorities and within the Guttiferae by others; in Plants of the World Online and World Flora Online it is placed within the Calophyllaceae.

Two varieties are accepted: Mesua ferrea var. coromandeliana (Wight) N.P. Singh, from southern India; and Mesua ferrea var. ferrea, found across the Indian subcontinent, Indochina, Peninsular Malaysia, Borneo, Java, and the Philippines.

1.2 Common and Vernacular Names

The plant is known in English as the Ironwood of Assam or Ceylon Ironwood, Indian Rose Chestnut, and Cobra's Saffron. In Hindi and Sanskrit, it is known as Nagkesar or Nagakesar. It is locally known in Sri Lanka as Naa, also called cobra saffron in English, and Naga in various languages across Asia; the word Naa is derived from the Sanskrit and Pali word Naga, meaning "cobra." Other vernacular names include Nagachampa (Marathi), Nagasampige (Kannada), Nagachempakam (Malayalam), Irul (Tamil), Naremushk (Farsi), and Nagesar (Bengali).

1.3 Morphology and Geographic Distribution

Mesua ferrea is native to various parts of Asia, including Cambodia, India, Malaysia, Myanmar, the Philippines, Singapore, Sri Lanka, Thailand, and Vietnam. It can reach heights of 18 to 30 meters and have a trunk diameter of up to 2 meters. The bark of younger trees is ash grey and flaky, while older trees have a dark ash-grey bark with a red-brown blaze.

It is widely cultivated as an ornamental for its graceful shape, grayish-green foliage with a striking pink to red flush of drooping young leaves, and its large, fragrant white flowers. The tree has opposite, leathery, lanceolate to linear-lanceolate leaves that are 6–10 cm long and 2–4 cm wide, dark green above and glaucous beneath. It produces large, solitary, axillary flowers, 5–8.5 cm in diameter, with four white petals and numerous golden-yellow stamens, followed by broadly ovoid, dehiscent fruits about 3 cm long containing 1–4 seeds. The bark exudes an aromatic white resin when cut.

It is native to wet, tropical parts of Sri Lanka, India, southern Nepal, Burma, Thailand, Indochina, the Philippines, Malaysia, and Sumatra, where it grows in evergreen forests, especially in river valleys. In the eastern Himalayas and Western Ghats in India, it grows up to elevations of 1,500 meters.

It is the national tree of Sri Lanka, as well as the state tree of Mizoram and the state flower of Tripura in India. The tree was declared the national tree of Sri Lanka on February 26, 1986, based on its cultural, religious, and historic importance, as well as its unique qualities including wide distribution, usage, and appearance.

1.4 Plant Parts Used Medicinally

The parts of the plant used for treatment include buds, bark, leaves, seeds, stamens, and fruits. The oily seeds are edible when well cooked, and both the seeds and the flowers are used locally in traditional medicine.

2. Traditional and Historical Use

2.1 Ayurvedic Tradition

Mesua ferrea L. (Nagakesar) is a plant which has traditionally been used for its antiseptic, anti-inflammatory, blood purifier, anthelmintic, cardiotonic, diuretic, expectorant, antipyretic, purgative, antiasthmatic, antiallergic, and several other effects.

In the Ayurvedic classical literature, the drug Nagakesar is discussed in texts attributed to both Susrutha and Vagbhata. Susrutha and Vagbhata used synonyms of this plant and placed it in multiple classification groups (Ganas), including Elādi, Vacādi, Anjanādi, and Priyangvadi ganas. It is one of the herbs within the Chaturjata group of Ayurvedic medicines.

Classical Ayurvedic properties assigned to Nagakesar are extensive. The genuine Ayurvedic drug Nagesar is considered astringent, stomachic, cooling, carminative, expectorant, and purgative. In traditional Ayurvedic use, it is indicated for urinary tract disorders, gout, pruritus, inflammation and edema, digestive ailments, fever, nausea, vomiting, bad breath, skin diseases, herpes, and headache, and it has also been used in the treatment of female infertility.

Traditionally, the plant has been used for its antiseptic, anti-inflammatory, antiasthmatic, and antiallergic activities, and it is an ingredient of Ayurvedic formulations like Brahma Rasayana and Chyavanprash, which are used to improve immunity. Mesua ferrea is available in different Ayurvedic formulations including dasamoolarishta, kanakasava, mahakaleshwara, lakshadi Taila, Nagakesaradi Churna, and Kumaryasava. It hastens fermentation and imparts fragrance to Asava and Arishta preparations used in Ayurveda.

2.2 Specific Traditional Preparations

Flowers are considered astringent and stomachic, made into paste with butter and used in bleeding piles and burning feet. Powdered flower buds mixed with honey are given in blood dysentery, piles, and leucorrhea. The bark acts as a tonic after childbirth and is also considered useful in anemia.

Seed oil is applied externally to relieve pain and inflammation. A traditional remedy for hemorrhoids involves taking 2–3 grams of Nagakesar stamens, rubbing them with ghee to form a fine paste.

In Malaysia, a poultice of seed oils or crushed kernels is used for wound healing, while the flowers and root decoction are used by women after childbirth. In Thailand, seeds are used as an aromatic, cardiotonic, expectorant, and wound healer.

Flowers mixed with butter and sugar are used in the treatment of bleeding piles and burns. Leaves and flowers have antidote effects against snake bite and scorpion stings, and the plant is used as an active ingredient of herbal formulations as an immune booster, expectorant, cough suppressant, anti-emetic, anti-inflammatory, analgesic, cardiac tonic, and anticancer agent.

2.3 Use in Southeast Asian Traditions

Asian people have traditionally utilized different species of Mesua to treat a wide range of conditions, including asthma, cough, dyspepsia, fever, itching, nausea, and kidney illnesses. Mesua ferrea L. was also commonly used in Uyghur medicine.

The fragrant white flowers are sacred in Buddhist and Hindu traditions and are used in temple offerings and religious ceremonies.

3. Phytochemistry: Key Constituents and Active Compounds

3.1 Overview of Chemical Classes

Mesua ferrea showed a wide range of phytochemical constituents responsible for its different medicinal properties. Specifically, it contains alkaloids, glycosides, reducing sugars, tannins, phenolics, coumarins, sterols, xanthones, volatile oil, triterpenoids, resins, and saponins. High medicinal importance of M. ferrea is due to the presence of various bioactive phytocomponents including glycosides, flavonoids, triglycerides, resins, sesquiterpenes, fatty acids, steroids, tannins, and saponins.

3.2 Plant-Specific Novel Compounds

The plant also consists of various active compounds like α-copaene and germacrene D, β-amyrin, and β-sitosterol, and some new compounds named mesuanic acid; mesuaferrols A and B; mesuaxanthones A and B; mesuaferrins A, B, and C; mesuaferrones A and B; mesuarin; and mesuol.

Numerous phytochemicals have been discovered and isolated from Mesua ferrea plant parts which include xanthones, terpenoids, sterol, β-amyrin, β-sitosterol, mesuaferrol, mesuaferrin-A, mesuaferrin-B, caloxanthone C, 1,8-dihydro-3-methoxy-6-methylanthraquinone, friedelin, fats, flavanoids, and betulinic acid.

3.3 Volatile Oils and Essential Oil Composition

The constituents of the essential oil depend on the plant part. Oil extracted from bark contains predominantly (E)-α-bisabolene (31.3%) and α-selinene (12.2%); oils of tender and mature leaves contain α-copaene (19.3% and 9.9%) and β-caryophyllene (18.8% and 26.0%); whereas oil from flower buds and flowers contains α-copaene (28.7% and 20.2%) and germacrene D (19.0% and 16.1%).

3.4 Seed Oil Constituents

Seed oil contains 4-phenyl coumarin analogues including mesuol, mammeigin, mesuagin, mammeisin, and mesuone. Seed oil is also rich in oleic, stearic, and palmitic acids. A coumarin named mesuarin was isolated from the seed oil of M. ferrea. The yellow crystal compound mesuol was also obtained from M. ferrea oil. A 4-phenylcoumarin, mesuagin, was isolated from the seed oil with the structural formula 5-hydroxy-6-isobutyryl-8,8-dimethyl-4-phenyl-2H,8H-benzo[1,2-b:3,4-b']dipyran-2-one. Phenolic components of the seed oil include mammeigin and mesuol.

3.5 Stamen Constituents

Stamens possess essential oil and contain α-β-amyrin, β-sitosterol, and biflavonoids.

3.6 Biflavonoids

Based on anti-virulence activity investigations on Salmonella, the ethyl acetate extract of Mesua ferrea flower was investigated for its chemical constituents. Ten purified compounds were identified. The biflavonoids rhusflavanone and mesuaferrone B were found to exhibit inhibitory effects on the secretion of Salmonella pathogenicity island 1 (SPI-1) effector proteins. Additionally, 5,6,6′-trihydroxy-[1,1′-biphenyl]-3,4-b′-dicarboxylic acid was identified as a new natural product from M. ferrea flower.

4. Mechanisms of Action

4.1 Anti-inflammatory Mechanisms

Network pharmacology and molecular docking studies indicate that androgen receptor, estrogen receptor alpha, CYP19A1, retinoic acid receptor alpha, nuclear factor erythroid 2-related factor 2, nuclear factor kappa B subunit 1, and albumin are crucial proteins engaged directly or indirectly in inflammatory pathways. After target validation by molecular docking and MD simulation, the findings suggest that M. ferrea may be effective for alleviating inflammatory conditions via multi-compound, multi-target, and multi-pathway mechanisms.

Xanthone derivatives isolated from the plant have historically been associated with both anti-inflammatory and CNS-depressant effects. Anti-inflammatory and CNS depressant activities have been documented for xanthones from both Calophyllum inophyllum and Mesua ferrea in the Indian pharmacological literature.

4.2 Antidiabetic Mechanisms

Mesua ferrea L. is used in Ayurvedic and Thai medicine for treating various diseases including diabetes. Bioassay-guided fractionation of leaves isolated eight polyphenols including six coumarins and two flavonoids. Five compounds displayed significant α-glucosidase inhibitory activity with IC50 values ranging from 1.81 to 42.97 µM.

Methanol extract of M. ferrea leaves has been shown to have promising antidiabetic activity in streptozotocin-induced diabetic rats, and the extract was suggested to increase the secretion of insulin from pancreatic β-cells.

The plant has also shown α-amylase inhibitory activity, suggesting a dual mechanism for blood glucose modulation via both α-glucosidase and α-amylase inhibition, both established in preclinical settings only.

4.3 Immunomodulatory Mechanisms

Mesuol, isolated from M. ferrea seed oil, was evaluated for immunomodulatory activity in experimental animals. In a humoral immune response model, mesuol evoked a significant dose-dependent increase in antibody titer values in cyclophosphamide-induced immunosuppression. In a cellular immune response model, an increase in paw volume was recorded in cyclophosphamide-immunosuppressed rats.

4.4 Anticancer Mechanisms

M. ferrea L. stem bark subfractions have been reported to exhibit anticancer properties against human colorectal carcinoma cells (HCT 116 cell line) through triggering apoptosis and modulating different cell signaling pathways.

The flowering buds of M. ferrea extract exhibited significant inhibitory effects on the proliferation of breast cancer cells in preliminary research. Eleven bioactive sub-fractions were obtained from methanol extraction, and MF-P-5 showed the strongest inhibitory activity against MDA-MB-231 and 4T1 cells.

5. Scientific Evidence by Area of Use

5.1 Anti-inflammatory and Analgesic Activity

Results of a study indicated that the 80% ethanol extract of Mesua ferrea possesses potent anti-inflammatory activity in both acute and chronic models. These experiments are preclinical (animal-based) and do not constitute human clinical evidence. In several in vitro and in vivo studies, phytocompounds from M. ferrea have exhibited considerable anti-inflammatory and analgesic activity in preclinical studies. No randomized controlled trials (RCTs) or other formal human clinical studies have been identified that isolate and test anti-inflammatory effects in humans. Evidence remains at the preclinical (animal and in vitro) level.

5.2 Antiarthritic Activity

Findings from a preclinical study demonstrate that the study validates the ethnomedicinal use of seeds of Mesua ferrea in the treatment of arthritis conditions. This is animal-model evidence only. No human trials have been identified. Evidence is preliminary and limited to in vivo animal models.

5.3 Antimicrobial Activity

Partially purified fractions of Mesua ferrea were most sensitive against Staphylococcus aureus, Pseudomonas aeruginosa, and Protease mirabilis, with maximum zones of inhibition of 16, 21, and 17 mm in diameter, respectively, at a concentration of 20 µg. M. ferrea L. leaf extracts demonstrated strong antibacterial activity against Staphylococcus aureus at a low minimum inhibitory concentration (MIC) of 48.00 µg/mL. These findings are all in vitro. No human clinical trials have been conducted. Evidence is preclinical only.

5.4 Antidiabetic Activity

Studies aimed at isolating bioactive constituents from M. ferrea leaves with potential α-glucosidase inhibitory activity, using bioassay-guided fractionation, isolated eight polyphenols. Five compounds displayed significant α-glucosidase inhibitory activity with IC50 values ranging from 1.81 to 42.97 µM. This is in vitro evidence. The antidiabetic activity in streptozotocin-induced rats (animal model) is the only in vivo work documented. No human clinical trials have been identified. Evidence is preliminary, at in vitro and animal model stages.

5.5 Antioxidant Activity

A study evaluated the antioxidant activity of dried flower methanolic extract of Mesua ferrea in male Wistar rats at three graded doses: 50, 100, and 200 mg/kg of body weight. Antioxidant activity has also been demonstrated in multiple in vitro assays across different plant part extracts. Evidence is preclinical (in vivo animal and in vitro) and has not been evaluated in human trials.

5.6 Anticancer / Antineoplastic Activity

In vitro cytotoxicity tests on extracts of M. ferrea against nine cancer cell lines — including Raji, SNU-1, HeLa, LS-174T, NCI-H23, SK-MEL-28, Hep-G2, IMR-32, and K562 — were performed using MTT assay. A coumarin mesuol isolated from M. ferrea L. seed oil demonstrated the ability to restore hematological profiles in Wistar rats with cyclophosphamide-induced myelosuppression. All anticancer work to date is in vitro or in animal models; no human clinical trials exist. Evidence is preliminary and mechanistic.

5.7 Anti-virulence Activity

The biflavonoids rhusflavanone and mesuaferrone B exhibited inhibitory effects on the secretion of Salmonella pathogenicity island 1 (SPI-1) effector proteins (SipA, B, C, and D) without affecting bacterial growth. This anti-virulence (rather than direct bactericidal) mechanism is an area of active in vitro investigation only. No clinical data exists.

5.8 CNS Depressant Activity

Scientific screening of the plant confirms central nervous system (CNS) depressant activity. This effect has been attributed particularly to xanthone fractions in preclinical studies. No human clinical data on sedation, anxiolysis, or related neurological endpoints is available. Evidence is animal-model level only.

5.9 Hepatoprotective Activity

A hepatoprotective effect of stamen extracts of Mesua ferrea L. against oxidative stress induced by carbon tetrachloride (CCl₄) in a liver slice culture model was reported. All hepatoprotective evidence is in vitro or in animal models. No human clinical evidence has been identified.

5.10 Wound Healing

Based on current study findings, the role of Mesua ferrea in wound healing is proposed to be established using well-designed experiments. Preclinical evidence supports traditional wound healing use; no controlled human clinical trials have been identified.

5.11 Antimalarial Activity

A study investigated the therapeutic potential of Mesua ferrea as a source for novel antimalarial compounds, conducting in vitro assays to evaluate antimalarial activity and cytotoxicity of crude extracts from leaves and branches, followed by assessment of antimalarial efficacy and acute oral toxicity in mouse models. Previous studies revealed that Mesua coumarins isolated from M. ferrea L. blossoms exhibit antimalarial activity against the chloroquine-resistant P. falciparum W2 strain. No human clinical trials on antimalarial use have been identified.

5.12 Skin Permeation Enhancement

A mechanistic investigation of Mesua ferrea L. seed kernel oil as a natural skin permeation enhancer found, in an ex vivo pig ear epidermis study, that oil pre-treatment resulted in better transdermal flux of the model drug Diltiazem HCl compared to controls. The oil also exhibited significantly higher penetration enhancement compared to the standard enhancer Transcutol, with the maximum enhancement observed at 15% v/v in propylene glycol. This supports potential pharmaceutical applications but is not clinical human evidence of therapeutic benefit.

6. Body Systems and Health Areas of Association

In several in vitro and in vivo studies, phytocompounds from Mesua ferrea have exhibited pharmacological activities including antimicrobial, anticancer, anti-inflammatory, antiulcer, antihistaminic, CNS depressant, antiarthritic, anticonvulsant, immunomodulatory, antioxidant, hepatoprotective, analgesic, antispasmodic, antivenom, wound healing, and spermicidal effects in preclinical studies.

• Musculoskeletal system: Anti-inflammatory and antiarthritic activity (preclinical models of arthritis)
• Gastrointestinal system: Traditional use for bleeding piles, dysentery, nausea, vomiting; antiulcer activity in preclinical studies
• Immune system: Immunomodulatory activity demonstrated in vivo with mesuol; ingredient in classical immune-supporting formulations
• Endocrine/metabolic system: Antidiabetic activity via α-glucosidase and α-amylase inhibition (preclinical only)
• Hepatic system: Hepatoprotective activity against CCl₄-induced oxidative damage (preclinical only)
• Central nervous system: CNS depressant effects attributed to xanthone fraction (preclinical)
• Cardiovascular system: Traditional use as a cardiotonic
• Respiratory system: Traditional use in asthma and as an expectorant
• Integumentary system: Wound healing, skin ailments; seed oil investigated as skin permeation enhancer
• Oncology: Cytotoxic activity against multiple cancer cell lines in vitro; antineoplastic activity in animal models
• Urogenital system: Traditional use in urinary tract disorders and female infertility

7. Dosage Forms and Reported Dosages

A subacute toxicity study of the ethanolic extract of Mesua ferrea flowers (MFE) was conducted in accordance with OECD Guideline 407, wherein MFE was administered orally to groups of male and female rats at the doses of 100, 500, and 1000 mg/kg over a period of 28 days.

A study evaluating antioxidant activity used dried flower methanolic extract of Mesua ferrea in male Wistar rats at three graded doses: 50, 100, and 200 mg/kg of body weight.

Acute toxicity assessments of the methanol extract derived from M. ferrea flowers were conducted on Swiss albino mice utilizing three distinct dosage levels: 50, 500, and 2000 mg/kg.

Traditional Ayurvedic dosage forms include powders (churna), decoctions, medicated oils, pastes, and fermented preparations (arishta/asava). One recorded traditional remedy specifies 2–3 grams of Nagakesar stamens rubbed well with ghee to make a fine paste for hemorrhoids. The plant is used in powder form alongside other spices and is incorporated into herbal jams including Chyawanprash.

No standardized dosage has been established in human clinical trials for any indication. All pharmacological dosages reported in the literature pertain exclusively to animal studies. Dosages used in human Ayurvedic formulations are determined by traditional classical texts and are not supported by clinical dose-finding studies.

8. Safety Considerations

8.1 Acute Toxicity

For Mesua ferrea extracts (including seed-derived), oral acute toxicity tests in mice yielded LD50 values exceeding 2,000 mg/kg, with no significant histopathological changes in liver or kidney tissues. The safety profile of nahor seed oil was studied by acute toxicity study in a rat model and MTT assay with mouse brain endothelial cells (bEnd.3). TLC and LC-MS analysis suggested the oil is composed of fatty acids similar to other USP grade oils. The acute toxicity study and MTT assay suggest the safe use of the nahor oil at the cellular level in the living system.

8.2 Subacute (Repeated-Dose) Toxicity

In a 28-day repeated dose study conducted per OECD Guideline 407, MFE was administered orally at 100, 500, and 1000 mg/kg. Repeated administration had no adverse effect on growth rate and hematological parameters. There were no changes in biochemical parameters except a slight decrease in total cholesterol levels, and an increase that corroborated with histopathological findings exhibiting mild lymphocytic infiltration and hepatocyte degeneration in liver tissues of both sexes at the highest dose. The no-observed-adverse-effect level (NOAEL) was established at 500 mg/kg. Though the overall effects of the extract at the highest dose did not translate into any serious complications, its effect on hepatic function needs to be established over a longer period.

8.3 Anti-virulence vs. Cytotoxic Balance

The biflavonoids rhusflavanone and mesuaferrone B exhibited inhibitory effects on Salmonella SPI-1 effector proteins without affecting bacterial growth, suggesting that at least some active constituents exert anti-infective effects through mechanisms other than direct cytotoxicity.

8.4 Absence of Human Safety Data

No specific clinical trials on human safety exist as of 2024. Internal use lacks sufficient data. Further studies are still required to explore the molecular targets responsible for the observed pharmacological activities and to test the efficacy of isolated compounds or standardized extracts in properly designed experiments. Long-term toxicity studies are also required to establish the safety profile of isolated compounds and standardized extracts.

8.5 Pregnancy

The plant may be contraindicated during pregnancy, though traditional sources vary on lactation safety. No controlled human data exists on reproductive toxicity.

8.6 Drug Interactions

No formally characterized drug–herb interactions have been identified in controlled human studies. The plant's documented CNS-depressant activity in preclinical models raises the theoretical concern of additive effects with centrally acting drugs, but this has not been studied in humans. The preclinical hepatic findings at high doses suggest caution regarding combination with hepatotoxic agents, though this too remains unstudied in humans.

9. Overall Evidence Assessment

The scientific literature on Mesua ferrea is extensive at the phytochemical and preclinical levels. Considerable pharmacological activities have been demonstrated in in vitro and in vivo studies, including antimicrobial, anticancer, anti-inflammatory, antiulcer, antihistaminic, CNS depressant, antiarthritic, anticonvulsant, immunomodulatory, antioxidant, hepatoprotective, analgesic, antispasmodic, antivenom, and wound healing effects. However, the overwhelming majority of this work is in vitro or animal-model based. To date, no peer-reviewed, randomized controlled clinical trials in human subjects have been identified for any specific health indication. The plant is widely distributed in tropical areas, especially Asian countries, and is traditionally used by local peoples for curing diseases ranging from headache to cancer, but clinical translation of these traditional uses remains incomplete. The current state of evidence should be characterized as promising but preliminary: rich phytochemical diversity, multiple documented preclinical activities, and a longstanding tradition of use, but an absence of human clinical trials necessary to establish efficacy or confirm safety in therapeutic contexts.

References

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