Ngai camphor
StarBlumea balsamifera
Synonyms: Blumea balsamifera var. microcephala, Baccharis salvia, Pluchea appendiculata, Baccharis gratissima, Conyza balsamifera, Conyza grandis, Pluchea balsamifera, Blumea appendiculata, Placus balsamifer, Blumea densiflora var. excisa, Blumea excisa, Conyza vestita, Blumea grandis
Safety at a glance
No rule in our tables for this herb: pregnancy, breastfeeding, incompatible pairs (十八反 / 十九畏), herb–drug, dose ceiling. This is not a safety clearance.
Not graded — No toxicity grade is recorded. Most herbs in the catalogue carry none.
Traditionally used for
- Cough & breathing
- Urinary & fluids
- Pain & joints
- Energy & fatigue
Cautions & contraindications
- Young children
- Liver conditions
- Seizure disorders
- Toxic — professional use only
Western Herbalism Properties
Traditional Uses
In the Philippines, Blumea balsamifera ('sambong') leaf is officially recognized in the Philippine National Formulary and Philippine Pharmacopoeia and is widely used as a decoction to promote diuresis and to dissolve urinary calculi, as well as for cough and colds (Department of Health Philippines, 1997). In Indonesian and Malay 'jamu' medicine, the leaves ('sembung') are taken as an expectorant and warming tonic for cough, post-partum recovery, and rheumatic pains (Burkill, 1966).
Gallery
Botanical Description
Blumea balsamifera (Asteraceae) is a robust aromatic perennial shrub or subshrub native to South and Southeast Asia, including India, Bhutan, southern China, Myanmar, Thailand, Indochina, the Philippines, Indonesia, and Malaysia, where it grows in open grasslands, forest clearings, and disturbed ground from sea level to 1500 m elevation. Plants reach 1-3 m in height with stout, longitudinally ridged, white-woolly stems. The alternate elliptic to oblanceolate leaves are 15-30 cm long, irregularly toothed and sometimes auriculate at the base, densely silky-tomentose beneath, and emit a strong camphoraceous odor when crushed due to a high content of l-borneol and related monoterpenes. Numerous small yellow discoid heads are borne in large terminal leafy panicles in the dry season. The genus is well known in trade for 'Ngai camphor' distilled from the leaves of this species.
Active Constituents
l-Borneol
Bicyclic monoterpene alcoholConcentration: The dominant volatile of the leaf; reported at 33% and at 44% of the leaf essential oil in two separate GC-MS analyses
l-Borneol is the reason this plant matters industrially: since the 2010 edition, the Pharmacopoeia of the People's Republic of China lists Blumea balsamifera leaf as the botanical source of Ai Pian (Borneolum), and it is the only plant source of natural l-borneol in that pharmacopoeia. Pharmacologically it is an aromatic orifice-opening agent in Chinese use and, in preclinical work, a reversible permeation enhancer that increases both skin penetration and blood-brain barrier passage of co-administered drugs.
D-Camphor
Bicyclic monoterpene ketoneConcentration: About 9.5% of the leaf essential oil
Contributes the medicinal-camphoraceous odour and the counter-irritant action of the topical oil. Camphor is also the constituent that sets the ceiling on internal use of the volatile oil, because it is convulsant in overdose and particularly hazardous in young children.
(E)-beta-Caryophyllene
Bicyclic sesquiterpene hydrocarbonConcentration: Roughly 6-8% of the leaf essential oil
A cannabinoid CB2 receptor agonist and the usual candidate for the anti-inflammatory activity attributed to the leaf oil in topical use. Present at far lower concentration than borneol.
Ledol
Tricyclic sesquiterpene alcoholConcentration: About 7% of the leaf essential oil
A characteristic sesquiterpene alcohol of the leaf oil. It is a recognised marker of the oil's composition rather than an ingredient with an established clinical action.
Blumeatin
Dihydroflavonol (flavonoid)Concentration: One of the principal flavonoids of the leaf; total leaf flavonoids reported around 2.9%, against about 1.4% in stems and 1.2% in branches
The signature flavonoid of the species, reported hepatoprotective and antioxidant in preclinical assays and a cholinesterase inhibitor in vitro. All of this is laboratory work; there is no human evidence for a blumeatin-attributable clinical effect.
Dihydroquercetin and its 4'-methyl and 7,4'-dimethyl ethers
Dihydroflavonols (flavonoids)Concentration: Major members of the leaf flavonoid fraction
Antioxidant flavonoids of the non-volatile fraction, credited in the review literature with the plant's radical-scavenging and hepatoprotective activity in animal and cell models. Dihydroquercetin is better known as taxifolin.
Blumealactones A, B and C
Sesquiterpene lactonesConcentration: Minor leaf constituents, isolated from the plant in 1988
Structurally characterised sesquiterpene lactones specific to the genus. As a chemical class, sesquiterpene lactones are the usual cause of Asteraceae contact dermatitis, which is the practical reason to expect occasional allergic skin reaction to topical Blumea preparations.
⚠ Drug Interactions
Loop and thiazide diuretics (furosemide, hydrochlorothiazide)
Blumea balsamifera leaf is used specifically as a diuretic and stone-clearing agent, and this is the indication with the strongest human support: a 2020 systematic review in Acta Medica Philippina pooled trials of the standardised Philippine sambong tablet in urinary tract stone disease and found significantly greater stone-size reduction and stone passage than placebo. A herb given for its diuretic effect will add to a pharmaceutical diuretic. No formal interaction study has been done, so the interaction is inferred from the shared pharmacodynamic target rather than measured.
Clinical note: If a patient on a loop or thiazide diuretic is also taking sambong for stones, monitor for orthostatic symptoms and check potassium; reduce the herb rather than the prescribed diuretic if volume depletion appears.
Lithium
Lithium is handled by the proximal tubule in parallel with sodium, so any agent that alters sodium and water handling can alter lithium clearance. Blumea balsamifera is taken specifically for its diuretic action. There is no study of this pair; the concern is extrapolated from the general behaviour of diuretics with lithium.
Clinical note: Avoid starting a diuretic herb in a lithium-treated patient without a plan to recheck the lithium level.
Centrally acting drugs co-administered with borneol-containing preparations
Borneol, the dominant constituent of this leaf and the Pharmacopoeia drug Ai Pian derived from it, reversibly increases blood-brain barrier permeability. A preclinical systematic review and meta-analysis in Drug Delivery (2018) pooled animal studies and concluded that borneol consistently enhances central nervous system delivery of co-administered agents, which is precisely why Chinese formulas use it as a messenger or guiding drug. The evidence is entirely animal; no human study has quantified the effect.
Clinical note: Treat concurrent use with sedatives, opioids or antiepileptics as a reason for caution rather than a proven interaction, and be alert for exaggerated central effects at unchanged drug doses.
Other camphor-containing preparations (topical rubs, mothball-type products, Chinese aromatic formulas)
The leaf volatile oil contains roughly 9.5% D-camphor by GC-MS. Camphor toxicity from combined topical and oral sources is a well-recognised paediatric poisoning, and the risk is one of total dose rather than of any single product. The Blumea oil should therefore be counted alongside any other camphor source a patient is using.
Clinical note: Do not apply Blumea volatile oil to the face or nostrils of infants or young children, and do not stack it with other camphor-containing rubs. The undiluted oil is not for internal use.
Topically applied prescription drugs (corticosteroids, antifungals, NSAID gels)
Borneol is used deliberately as a percutaneous penetration enhancer, and enhancement of skin penetration is one of the activities catalogued for this plant in the 2014 Molecules review. Applying a Blumea oil preparation over or with a prescription topical could increase systemic absorption of that drug. This is a mechanistic expectation supported by borneol's known behaviour, not a measured clinical interaction.
Clinical note: Keep Blumea oil applications separate in time and site from potent topical corticosteroids, particularly on large surface areas or broken skin.
Hepatotoxic drugs and undiluted internal use of the volatile oil
Pang and colleagues applied the volatile oil topically to rats at three dilutions and found that the diluted oil left liver enzymes and histology essentially unchanged, but that the undiluted 100% oil produced mild biochemical and histological liver changes (Molecules, 2014). The authors concluded that short-term external application of appropriately diluted oil appears safe for the liver while cautioning against internal use of the concentrated oil. This is a rodent dermal study, not a human one.
Clinical note: Use the leaf as an infusion or a standardised tablet rather than as neat volatile oil, dilute the oil for topical use, and avoid concentrated oil preparations in patients already on hepatotoxic medication.
Asteraceae-family allergens (ragweed, chamomile, feverfew, Arnica)
Blumea balsamifera is an Asteraceae species and contains sesquiterpene lactones (blumealactones A to C). Sesquiterpene lactones are the established sensitising class behind Compositae contact dermatitis, so a patient already reactive to other Asteraceae members has an identifiable reason to react to this one.
Clinical note: Patch test before extended topical use in patients with a history of Compositae dermatitis.
Dosage Calculator
⚖ Dosage Calculator
A weight-based mathematical estimate for Ngai camphor. Not a prescription.
Evidence Tier
1 systematic review · 5 studies on recordRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
1
0 verified · 1 unverified
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
0
In vitro / animal
4
0 verified · 4 unverified
Show 4 studies
- External Application of the Volatile Oil from Blumea balsamifera May Be Safe for Liver — A Study on Its Chemical Composition and Hepatotoxicity
- Effect of Blumea balsamifera extract on the phase and morphology of calcium oxalate crystals
- Phytochemical compositions of volatile oil from Blumea balsamifera and their biological activities
- Cholinesterase Inhibitory Activities and In Silico Docking Studies of Blumeatin Isolated from Blumea balsamifera L. DC.
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
A Systematic Review on the Safety and Efficacy of Blumea balsamifera (L.) DC (NIRPROMP Tablet) for the Treatment of Urinary Tract Stone
The best human evidence for this species. Twenty studies were screened and four met inclusion criteria for the standardised Philippine Blumea balsamifera (sambong) tablet in urinary tract stone disease. Patients taking sambong showed substantially greater radiographic reduction in stone size than placebo and were markedly more likely to pass stones and to have symptoms resolve, with the preparation reported as well tolerated. The included trial base is small and Philippine, so the result should be read as promising rather than definitive.
External Application of the Volatile Oil from Blumea balsamifera May Be Safe for Liver — A Study on Its Chemical Composition and Hepatotoxicity
GC-MS of the leaf volatile oil identified 41 of 49 components, with l-borneol at 43.55%, D-camphor at 9.54%, 1-octen-3-ol at 8.31% and (E)-beta-caryophyllene at 6.51%. Sprague-Dawley rats, with intact and with wounded skin, then received the oil dermally at 1000 mg/kg at three concentrations. Diluted oil left ALT, AST, ALP, bilirubin and liver histology largely unchanged; the undiluted 100% oil produced mild biochemical and histological changes. The authors conclude short-term diluted external use appears safe for the liver and caution against internal use of the concentrated oil.
Effect of Blumea balsamifera extract on the phase and morphology of calcium oxalate crystals
Crystallisation study testing the mechanistic claim behind the traditional stone indication. Blumea balsamifera extract shifted calcium oxalate crystallisation away from the monohydrate phase that adheres to renal epithelium and altered crystal morphology, offering a plausible physicochemical explanation for the clinical stone findings. In vitro only, in artificial rather than human urine.
Phytochemical compositions of volatile oil from Blumea balsamifera and their biological activities
Characterises the composition of the leaf volatile oil and tests it for antimicrobial and antioxidant activity in laboratory assays. Useful as a chemical reference for what a Blumea oil preparation actually contains; the biological findings are preclinical screening rather than evidence of clinical effect.
Cholinesterase Inhibitory Activities and In Silico Docking Studies of Blumeatin Isolated from Blumea balsamifera L. DC.
Isolates blumeatin from the leaf and reports acetylcholinesterase and butyrylcholinesterase inhibition in vitro with supporting docking work. Preclinical and exploratory; it establishes a molecular activity for the plant's signature flavonoid, not a cognitive indication.
Historical Texts
Ben Cao Gang Mu, Li Shizhen, entry for Ai Na Xiang among the fragrant herbs of the herb section
Ming dynasty, completed 1578, first printed 1596 (Chinese tradition)Pharmacopoeia of the People's Republic of China, monograph for Ai Pian (Borneolum)
2010 edition onward, still current (modern Chinese official standard)Philippine folk and later government-endorsed use of sambong, formalised as the NIRPROMP standardised tablet
Long-standing folk use, brought into formal clinical evaluation from the 1990s (Philippine tradition)References
- Pang Y, Wang D, Fan Z, Chen X, Yu F, Hu X, Wang K, Yuan L. Blumea balsamifera—A Phytochemical and Pharmacological Review . Molecules (2014) [DOI]
- Widhiantara IG, Jawi IM. Phytochemical composition and health properties of Sembung plant (Blumea balsamifera): A review . Veterinary World (2021) [DOI]
- Fujimoto Y, Soemartono A, Sumatra M. Sesquiterpenelactones from Blumea balsamifera . Phytochemistry (1988) [DOI]
- Barua NC, Sharma RP. (2R,3R)-7,5'-dimethoxy-3,5,2'-trihydroxyflavanone from Blumea balsamifera . Phytochemistry (1992) [DOI]
- Zheng Q, Chen ZX, Xu MB, Zhou XL, Huang YY, Zheng GQ, Wang Y. Borneol, a messenger agent, improves central nervous system drug delivery through enhancing blood-brain barrier permeability: a preclinical systematic review and meta-analysis . Drug Delivery (2018) [DOI]
- Wang YH, Yu XY. Biological Activities and Chemical Compositions of Volatile Oil and Essential Oil from the Leaves of Blumea balsamifera . Journal of Essential Oil Bearing Plants (2018) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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