Kukui tree

Other Names

Aleurites ambinuxAleurites angustifoliusAleurites commutatusAleurites cordifoliusAleurites integrifoliusAleurites javanicaAleurites javanicusAleurites lanceolatusAleurites lobatusAleurites moluccanaAleurites moluccanusAleurites pentaphyllusAleurites remyiAleurites trilobaAleurites trilobusBancoulierBelgaum walnutBuah kerasCamirium cordifoliumCamirium moluccanumCamirium oleosumCandleberryCandlenutCandlenut treeCroton moluccanusDryandra oleiferaGodouIndian walnutJatropha moluccanaKakoonaKemintingKemiriKemiri nutsKuikuiKukuiKurupLamaLama (Samoa)LumbangMa yaoMallotus moluccanusNogueira de IguapeNoix de bancoulNoyer des MoluquesNuez de la IndiaOtaheiti walnutRata kekunaRicinus dicoccusRottlera moluccanaShi liSpanish walnutTelopea perspicuaTui tuiTuituiTung treeTutuiVarnish tree

Synopsis

Kukui Tree (Aleurites moluccanus): A Comprehensive Reference

Identity and Botanical Classification

Scientific Name and Taxonomy

The kukui tree, Aleurites moluccanus, commonly known as candlenut or Indian walnut, is a tree in the spurge family Euphorbiaceae. First described by Carl Linnaeus in 1753, the species' origin is unclear due to its spread by humans. This plant was first described by Carl Linnaeus in his Species Plantarum (1753) as Jatropha moluccana. The accepted current binomial is Aleurites moluccanus (L.) Willd., though the spelling variant Aleurites moluccana is widely used interchangeably in the literature. Recognized synonyms include Aleurites javanicus, Aleurites pentaphyllus, Aleurites trilobus, and Jatropha moluccana. Common names include candleberry, kemiri, varnish tree, Indian walnut, and kukui nut tree.

Common Names Across Cultures

The tree is known by many regional names, including kukui, candlenut-tree, tutui, nuez, nuez de India, lumbang, Sakan, and lama. In South America and Spain, it is marketed under the name "nuez de la India" or "semilla de Brasil." In Indonesia, the nut is known as kemiri; in the Pacific islands of Tonga and the Cook Islands, it is called tuitui.

Morphology

The tree grows to about 30 m (98 ft) tall and produces drupe fruit. The candlenut tree has wide spreading or pendulous branches. The leaves are pale green, simple, and ovate or heart-shaped on mature shoots, but may be three-, five-, or seven-lobed on saplings. They are up to 20 cm (8 in) long and 13 cm (5 in) wide, and young leaves are densely clothed in rusty or cream stellate hairs. Small but showy, five-petaled, creamy white flowers bloom in dense panicled cymes at the branch ends. Flowers are monoecious. Flowers typically bloom April to October but may bloom irregularly throughout the year, with flowers and fruits often present on the tree simultaneously. Female flowers are followed by thick-rinded, walnut-sized fruits up to 2 inches in diameter, each containing one to two large, nut-like seeds (candlenuts) with a high oil content.

Native Range and Distribution

The tree is native from Indonesia and Malaysia into the western parts of Polynesia, though the exact native range is unclear. It was very early spread and naturalized throughout Southeast Asia and the islands of the South Pacific. The species was introduced to some of the South Pacific islands more than 1,000 years ago and has since naturalized. It has also been found across many other countries in South Pacific, Africa, the Caribbean, and South America. Polynesian settlers reportedly brought this tree to Hawaii, where it has naturalized in open forests, lower alpine slopes, river margins, hillsides, and ridges. Although not native to Hawaii, kukui was designated the Hawaiian State tree in 1959.

Common Dosage Forms and Preparations

Kukui tree products are available in several distinct forms, each derived from a different plant part:

Kukui nut oil (candlenut oil): Extracted from the nut of Aleurites moluccanus, the candlenut or kukui. Solvent extraction of the oil from the crushed kernel yields a light yellow oil (density 0.92 g/cm³). Roughly half the weight of the kernel is oil. Originally, kukui oil was made by roasting the nutty fruits and squeezing them until the oil was released. Modern processing now allows for cold-pressing or expeller pressing.
Leaf extracts: Hydroalcoholic, aqueous, hexane, dichloromethane, and ethyl acetate fractions of dried leaves have been prepared and studied in pharmacological research. A semisolid (topical) preparation standardized to leaf extract has been investigated preclinically.
Seed (nut kernel): While mildly toxic when raw, the nut is appreciated in many cultures once cooked or toasted. Seeds are also consumed raw in some communities as an alleged weight-loss supplement, a practice associated with toxicity (see Safety section).
Bark extracts: Bark and root bark have been used in traditional preparations, including decoctions and infusions, for medicinal and waterproofing purposes.

Traditional and Historical Use

Archaeological and Pre-historical Evidence

Remains of harvested candlenuts have been recovered from archaeological sites in Timor and Morotai in eastern Indonesia, dated to around 13,000 and 11,000 BP, respectively. Archaeological evidence of candlenut cultivation is also found in Neolithic sites of the Toalean culture in southern Sulawesi dated to around 3,700 to 2,300 BP. Early Austronesian voyagers introduced candlenuts, as a canoe plant, widely across the Pacific islands, where the trees became naturalized to high volcanic islands.

Hawaiian Tradition

Kukui is the kinolau (bodily form) of the Hawaiian god Lono, and serves as Hawaiʻi's official state tree. The name itself carries deep meaning: Kukui means "light" in Hawaiian, hence its use as a common name. The Hawaiian relationship with the tree encompassed virtually every aspect of pre-contact life:

Illumination: In ancient Hawaiʻi, kukui fruits were burned to provide light. The nuts were strung in a row on a palm leaf midrib, lit on one end, and burned one by one every fifteen minutes or so. This led to their use as a measure of time. Hawaiians extracted the oil from the nut and burned it in a stone oil lamp called a kukui hele po (meaning "light, darkness goes") with a wick made of kapa cloth.
Culinary use: A Hawaiian condiment known as ʻinamona is made from roasted kukui mixed into a paste with salt. ʻInamona is a key ingredient in traditional Hawaiian poke.
Topical medicine: Hawaiians utilized kukui nut oil as a topical dressing for massaging sore muscles, soothing burns, chapped skin, and wounds. Kukui nut oil was also used for treating burns, cold sores, as a traditional therapeutic massage oil, and for preventing stretch marks during pregnancy.
General medicine: Medicinally, kukui was mixed with other plants to treat infected sores and to build one's strength after an illness.
Dye and tattooing: Soot from the charred nuts was used for tattooing. The inner bark was used to make a red-brown dye for tapa cloth.
Waterproofing and preservation: An infusion of bark and water was used as a fish net preservative.
Canoe and craft construction: Hawaiians could craft lightweight canoes and fishnet floats from the soft white wood.
Fishing: Seeds could be spat into the ocean to see fish more clearly — the oil film reducing surface glare.
Lei-making: The unshelled nuts with their glossy, polished, black, brown, and rarely white shells were used to make attractive leis, which are still being made today.
Agriculture: Hāmākua was famous for its pākukui, where groves of kukui provided essential agricultural mulch and nutrients required for kalo (taro) production.

Polynesian and Pacific Island Traditions

In Polynesia, dyes made from various parts of the tree have a long history of use on tapa cloth, canoes, and as ink for tattooing. The candlenut tree's wood is used for carving and making furniture, small utensils, and matches. Many cultures across the Pacific roasted the nut for use in cooking and sauces.

Southeast Asian and Indonesian Traditions

In Indonesian and Malaysian cuisine, the nut is commonly used in curries, and on the Indonesian island of Java, it is used to make a thick sauce that is eaten with vegetables and rice. Ethnopharmacological records from across Southeast Asia document the plant being applied to a wide range of conditions. According to traditional knowledge, its leaves, bark, and oil are used for the treatment of ulcers, fever, headache, asthma, conjunctivitis, gonorrhea, dysentery, hepatitis, and rheumatism. Leaves have been employed as poultices for contusions and swelling, and to cure asthma, stomach ulcers, headaches, fever, and hepatitis. The seed oil is mainly applied as a laxative as well as for hair treatment and worm eradication.

Key Constituents and Active Compounds

Fatty Acid Composition of Kukui Nut Oil

The seed oil is the most commercially prominent product. Kukui nut oil contains high amounts of polyunsaturated fatty acids — linoleic acid (18:2cΔ9,12) and linolenic acid (18:3cΔ9,12,15). More specifically, the oil is characterized by its significant content of linoleic acid (approximately 42%), linolenic acid (about 32%), and oleic acid (around 15%). Total polyunsaturated fatty acids in kukui nut oil reach 75.8 mg/100 mg, which is considered beneficial for skin healing.

Importantly, the fatty acid profile can shift with processing. Deodorized kukui nut oils have lower linolenic acid levels, approximately 27%, compared to undeodorized oils which can reach 32–34%. All kukui nut oils from Polynesian sources — Hawaii and Tonga — had identical fatty acid profiles over a 10-year study period.

Secondary Metabolites from Leaves and Bark

Phytochemical investigations of the leaves, bark, and seeds have identified a diverse range of secondary metabolites. These include steroids, triterpenes, coumarins, and flavonoid glycosides such as moluccanin, moretenone, acetyl aleuritic acid, moretenol, α-amyrin, β-amyrin, stigmasterol, β-sitosterol-3-β-D-glucopyranoside, swertisin, and campesterol. Swertisin and 2″-O-rhamnosylswertisin were also reported from the leaves of A. moluccana.

Additional isolates include a phorbol diester (13-O-myristyl-20-O-acetyl-12-deoxyphorbol), hentriacontane (a hydrocarbon), 6,7-dimethoxycoumarin, 5,7-trimethoxycoumarin, β-sitostenone (a phytosterol), and 2″-O-rhamnosylswertisin.

Chromatographic procedures carried out with the hexane fraction of leaves revealed the presence of n-hentriacontane, α-amyrin, β-amyrin, stigmasterol, β-sitosterol, and campesterol, identified by spectroscopic data and HRGC/MS techniques.

The bark dichloromethane extract contains acetyl aleuritolic acid, atraric acid, spruceanol, (5β,10α)-12-hydroxy-13-methoxy-8,11,13-podocarpatrien-3-one, and sonderianol.

In the seeds, the phytochemical composition of the aqueous extract presents five main compounds: procyanidin dimer B1; 6-C-pentosyl-8-C-hexosyl apigenin; isovitexin; 6-C-pentosyl-8-C-pentosyl luteolin; and neriifolin. Coumarins, naphthoquinone, steroids-triterpenes, and saponins have also been detected, as have phenolic compounds, tannins, and flavonoids — the latter three at the highest frequency.

The plant also includes a few unfavorable compounds, such as toxalbumin, which might influence blood agglutination and induce blood clotting. Moist heating treatment followed by drying may reduce the toxicity of the contained glycoproteins.

Mechanisms of Action: Key Compounds

2″-O-Rhamnosylswertisin (C-glycoside flavone): The hydroalcoholic extract obtained from A. moluccana leaves and its hexane fraction inhibited nociception induced by acetic acid in mice; this activity appears to be related to the compound 2″-O-rhamnosylswertisin, a C-glycosyl flavone. This compound has emerged as a principal active constituent for antinociceptive activity.
α- and β-Amyrenone (triterpenes): The presence of α- and β-amyrenone in the seed is associated with the inhibition of enzymes responsible for lipid and carbohydrate absorption.
Polyunsaturated fatty acids (seed oil): Highly polyunsaturated oils such as kukui nut oil allow transepidermal water loss because water permeability relates to the degree of unsaturation of the fatty acids in the oil. Transepidermal water loss, in turn, triggers healing.
Phorbol esters (seeds): Phorbol esters bear resemblance to diacylglycerol, which acts as a substrate of protein kinase C (PKC). The PKC is activated by phorbol esters and this causes a strong inflammatory response. PKC is an important regulatory enzyme involved in signal transduction at the cellular level. At pharmacological concentrations, phorbol esters also act as tumor promoters and strong cathartics (see Safety section).
Phenolic compounds, tannins, and flavonoids (seeds): The seed presents the highest concentrations of phenolic compounds, tannins, and flavonoids, which are phytochemicals with a recognized effect in promoting weight loss.

Scientific Evidence by Area of Use

1. Anti-Inflammatory and Antinociceptive Effects

This is the most extensively investigated pharmacological area for A. moluccana. All published evidence to date is preclinical (animal and in vitro models). No controlled human clinical trials have been published.

Leaf extracts — topical: A 2015 study published in Phytomedicine (PMID: 26196401) evaluated the mechanisms of a topical semisolid containing 10 mg/g of A. moluccana dried leaf extract in a murine ear-edema model induced by croton oil. The topical treatment was able to significantly inhibit ear edema (35.77 ± 7.35%). The study demonstrated for the first time that the mechanisms involved in the topical anti-inflammatory effect included a reduction in leukocyte migration and consequently diminished levels of cytokines and chemokines, indicating this herbal product as a promising anti-inflammatory phytomedicine to treat skin inflammatory diseases.

Leaf extracts — oral antinociception: Investigations of analgesic activity of various extracts from A. moluccana leaves, using the writhing test in mice, showed that the hydroalcoholic extract and the hexane fraction exhibited potent antinociceptive action. Several chemical constituents were isolated and identified from the hexane fraction. The identified compounds considerably inhibited acetic acid-induced abdominal constrictions, being more efficacious than aspirin and paracetamol in this animal model. This is a preclinical finding and cannot be directly extrapolated to humans.

Rheumatoid arthritis model: A 2019 preclinical study (PMID: 30769038) examined A. moluccanus leaf dried extract in rats and mice submitted to complete Freund adjuvant (CFA)-induced rheumatoid arthritis. The results reinforced the anti-hypersensitivity and anti-inflammatory activity of the extract. Part of the observed effects was attributed to the compound 2″-O-rhamnosylswertisin. Notably, the extract acted as a disease modifier, suggesting potential disease-modifying activity — though the nut oil had been topically applied in traditional practice to treat arthritis and joint pain.

Evidence strength: Preclinical (animal/in vitro) only. Results are mechanistically interesting but cannot be used to draw conclusions about efficacy or safety in humans.

2. Skin and Wound Healing

The oil's application to skin is the area with the longest history of use and the most commercially developed application. While rigorous randomized clinical trials are absent from the published literature, the mechanistic basis has been explored and the Cosmetic Ingredient Review (CIR) has evaluated it.

The purported benefits of kukui nut oil may be due to its unique chemical composition that influences its potential aid to certain skin conditions. Damaged skin heals best when a protectant is used as a barrier to prevent drying out and further skin damage. Healing also requires a protectant that allows transepidermal water loss. Highly polyunsaturated oils such as kukui nut oil allow transepidermal water loss because water permeability relates to the degree of unsaturation of the fatty acids in the oil. Transepidermal water loss, in turn, triggers healing.

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Aleurites moluccana Seed Oil safe for use in cosmetic and personal care products, based on its long history of safe use, composition, and lack of dermal irritancy or sensitization.

While the moisturizing effects of kukui nut oil are well documented, evidence supporting its other uses is anecdotal or limited. Clinical research on kukui nut oil's benefits is still ongoing; however, it is widely recognized as having potent moisturizing effects for both hair and skin.

Evidence strength: Mechanistic rationale (fatty acid composition, transepidermal water loss studies) is established. For moisturization and emollient effects, evidence is strong enough to underpin CIR approval. Wound healing, burn treatment, and anti-aging claims for topical oil are currently based on mechanistic reasoning and preclinical data, without published controlled human trials.

3. Lipid-Lowering (Hypolipidemic) Effects

Previous studies had demonstrated antiviral, antibacterial, and hypolipidemic effects of extracts and fractions obtained from A. moluccana. The 2002 study by Pedrosa et al., published in Phytotherapy Research, examined the hypolipidemic activity of a methanol extract of A. moluccana. The fruits and leaves of this plant are used in traditional medicine for the lowering of cholesterol. Phytochemical studies revealed the presence of triterpenes, steroids, coumarins, and flavonoid glycosides such as moretenone, moretenol, acetyl aleuritic acid, moluccanin, swertisin, α- and β-amyrin, stigmasterol, β-sitosterol, and campesterol.

A 2022 preclinical study published in Diabetology & Metabolic Syndrome (PMC) evaluated the effects of candlenut seed ingestion in obese Wistar rats. Thirty animals received either placebo, a popular therapeutic regimen of candlenut (8 days with oral administration of 0.2 mg/kg followed by 20 days with 0.4 mg/kg), or a doubled popular dose (called 2CN), for 28 days total. Rats receiving CN and 2CN showed reduced plasmatic levels of glucose and lipoproteins. In obese animals, the 2CN dose reduced LDL-c (p < 0.05), without significantly altering HDL-c. Blood levels of aspartate aminotransferase (AST) and gamma-glutamyl transferase (GGT) were reduced with the CN dose but increased with the 2CN dose, suggesting dose-dependent hepatotoxic potential.

Evidence strength: Preclinical (animal) only. No human lipid-lowering trials have been published. The animal data is preliminary and comes with significant toxicity caveats at higher doses.

4. Antimicrobial Activity

Studies have demonstrated anti-inflammatory, antinociceptive, antibacterial, anti-lipase, hypolipidemic, antiviral, and healing properties of A. moluccana. Key antimicrobial investigations include the work of Locher and colleagues (1995, 1996), which examined extracts of Hawaiian medicinal plants. These studies examined anti-microbial activity and anti-complement activity of extracts obtained from selected Hawaiian medicinal plants, and antiviral activity of Hawaiian medicinal plants against human immunodeficiency virus type-1 (HIV-1). These investigations were in vitro.

Aleurites moluccana is used to treat herpes viral infections as conventional Hawaiian medicine. It is thought that immune enhancement by A. moluccana is provided by certain flavonoid glycosides — moretenone, moretenol, acetyl aleuritic acid, moluccanin, and swertisin. These phytochemicals may be attributed to the antiviral activity against HSV types.

Evidence strength: In vitro and preclinical only. Activity against HIV-1, herpes simplex, Staphylococcus aureus, and Pseudomonas aeruginosa has been suggested in cell-culture and animal models. No published controlled clinical trials support antimicrobial use in humans.

5. Weight Management

The seed marketed under the name "nuez de la India" has been promoted as a weight-loss agent in Latin America, Spain, and other regions. The seed has gained notoriety as a fast weight-loss agent, despite the scarcity of information about its pharmacological mechanisms of action. The supposed weight loss induced by the seed is attributed to laxative and diuretic properties.

No scientific journal articles were found to support the use or efficacy of this seed for weight loss. A comprehensive internet and peer-reviewed literature search found no clinical evidence for efficacy. The animal evidence (see Hypolipidemic section above) shows some metabolic effects in rodents, but the authors of that study explicitly note that the mechanism of action of candlenut derivatives remains unclear.

Evidence strength: Very weak to absent. No human clinical trials have established efficacy for weight loss. Preclinical animal data is preliminary. Associated significant safety risks (see Safety section) further undermine the risk-benefit profile for this use.

6. Gastroprotective Activity

Candlenut oil has gained attention for its reported anti-inflammatory, antimicrobial, and antioxidant activities, attributed to its diverse phytochemical constituents. Prior research has primarily focused on its dermatological and anti-inflammatory applications, including effects on skin barrier repair, wound healing, and modulation of inflammatory mediators in vitro. In vivo and in vitro studies on related plant species have demonstrated similar effects, encouraging further pharmacological exploration. Despite its long-standing use in folk medicine, the scientific validation of A. moluccanus as a gastroprotective agent remains limited.

Evidence strength: Preliminary (preclinical). No human studies have been conducted specifically on gastroprotective effects.

Body Systems and Health Areas Associated with Kukui Tree

Integumentary system (skin, hair): The primary contemporary application — moisturization, emollient effects, wound support, burn soothing. CIR-reviewed as safe for topical cosmetic use. Traditional use for burns, wounds, chapped skin, and sunburn.
Musculoskeletal system: Traditional topical use for sore muscles and joint pain; preclinical evidence for anti-inflammatory and antinociceptive effects in arthritis models.
Immune and anti-infective systems: In vitro antiviral activity documented (HIV-1, HSV types); traditional Hawaiian use for herpes infections; in vitro antibacterial activity against Staphylococcus aureus and Pseudomonas aeruginosa.
Cardiovascular/metabolic system: Preclinical hypolipidemic effects (LDL-c reduction in obese rats); traditional use for cholesterol management.
Gastrointestinal system: Traditional use as a laxative (via seed); folk use for ulcers, gastritis, and dysentery; early preclinical gastroprotective investigations.
Respiratory system: Traditional use for asthma and cough, documented ethnopharmacologically across multiple cultures. No clinical evidence.
Hepatic system: Traditional use for hepatitis; preclinical data show dose-dependent liver enzyme changes (both protective and toxic depending on dose in animal models).

Dosage Forms and Dosages Reported in Studies

Because clinical trials in humans are essentially absent from the published literature for all indications, dosages below are drawn exclusively from preclinical studies or from ethnopharmacological documentation of traditional practice.

Topical semisolid (leaf extract), animal study (Cesca et al., 2012 / Phytomedicine 2015): The semisolid preparation contained 10 mg/g of A. moluccana dried extract, evaluated in a murine ear-edema model.
Oral seed extract, obese rat study (BMC Diabetology & Metabolic Syndrome, 2022): Animals received a popular therapeutic regimen consisting of oral administration of 0.2 mg/kg for 8 days, followed by 0.4 mg/kg for 20 days (28 days total), and a doubled dose group at 2× these amounts.
α,β-Amyrenone oral dose, mouse model (PubMed 2014): Oral treatment with α,β-amyrenone at 23.5 μmol/kg was compared against indomethacin (27.9 μmol/kg) on mechanical hypersensitivity induced by carrageenan (300 μg/paw) injection in mice.
Acute toxicity (seed extract, in vivo): In acute toxicity studies, no lethality was observed at an LD50 > 2000 mg/kg in a single dose by intragastric route. At short-term high concentrations, clinical symptoms of toxicity and death were observed; at low concentrations, no clinical signs associated with toxicity were shown.

No standardized dosage for any oral medicinal use in humans has been established or approved by any regulatory agency. Kukui nut oil is used topically in cosmetics at concentrations consistent with standard cosmetic formulation practices; specific concentration data for human cosmetic use were not identified in the peer-reviewed literature retrieved.

Safety Considerations and Toxicology

Raw Nut Toxicity

While mildly toxic when raw, the nut is appreciated in many cultures once cooked or toasted. The raw seed contains multiple toxic constituents:

Phorbol esters: Phorbol esters are toxic diterpene compounds present within the Euphorbiaceae and Thymelaceae botanical families. The phorbol moiety is comprised of one or two long-chained esters and bears resemblance to diacylglycerol, which acts as a substrate of protein kinase C (PKC). Phorbol esters of the tigliane type are very strong cathartics (purgatives) and also act as powerful tumor promoters due to their co-carcinogenic action.
Saponins: Candlenuts contain saponins and phorbol esters, which typically cause gastrointestinal symptoms such as vomiting and diarrhoea.

Gastrointestinal Symptoms of Ingestion

According to multiple sources, the ingestion of candlenut tree seeds causes a sensation of discomfort and nausea a few minutes after ingestion. These symptoms are followed by vomiting, abdominal pain (cramping), diarrhea, dehydration, as well as an imbalance in electrolytes. Some reports indicate diarrhea with fluid and electrolyte loss, mild to severe dehydration, and even death.

Toxicity of Seed for Weight Loss Use

Sound in vivo studies proving its safety and efficacy are rare. Cases of adverse effects associated with the consumption of this seed in different parts of the world have been reported. Several countries have prohibited its trade, but illegal sales and consumption appear to persist.

A critical safety concern is the documented adulteration of products sold as candlenut ("nuez de la India") with the highly toxic seeds of yellow oleander (Thevetia peruviana). Candlenuts (A. moluccana) and yellow oleander seeds (Thevetia peruviana) bear a physical resemblance to one another. Candlenuts are marketed as weight-loss supplements, while yellow oleander seeds contain toxic cardioactive steroids — as few as 2 seeds may cause fatal poisoning. Because of their physical similarities, the potential for a lethal substitution exists. A published case report describes a fatal outcome in a 63-year-old woman who ingested what she believed to be candlenut seeds, actually yellow oleander, resulting in bradycardia (nadir pulse of 30 beats/min), hyperkalemia (serum potassium 7.3 mEq/L), followed by ventricular fibrillation arrest and terminal asystolic arrest.

The seed has been popularly consumed for weight loss purposes, but reports of toxicity have been associated with its ingestion. In the literature, there are not enough studies to elucidate its toxicology fully.

Hepatotoxic Potential at Higher Doses

Blood levels of aspartate aminotransferase (AST) and gamma-glutamyl transferase (GGT) were reduced with the standard CN dose but increased with the doubled 2CN dose (p < 0.05) in obese rats, suggesting that higher doses may have hepatotoxic effects. This finding is from an animal study and its significance for human use is unknown.

Topical Oil Safety

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Aleurites moluccana Seed Oil safe for use in cosmetic and personal care products, based on its long history of safe use, composition, and lack of dermal irritancy or sensitization. The kernel is the source of candlenut oil, which has no known toxicity and is not an irritant, even to the eyes. While allergic reactions are exceedingly rare, individuals with known nut allergies are advised to perform a patch test.

Oxidative Stability

Given its elevated content of unsaturated fatty acids, Aleurites moluccanus Seed Oil is susceptible to oxidative degradation upon exposure to air, light, and humidity. Storage in a cool, dark environment is crucial to preserve its freshness and efficacy. Research indicates that nanoencapsulation can significantly enhance its oxidative stability within cosmetic formulations.

Toxalbumin Content

The plant also includes toxalbumin, which might influence blood agglutination and induce blood clotting. However, moist heating treatment followed by drying may reduce the toxicity of the contained glycoproteins. This is relevant for preparations involving raw or minimally processed plant material.

Evidence Summary

The body of published evidence for Aleurites moluccanus is primarily preclinical (animal and in vitro). The topical seed oil has the strongest practical evidence base — specifically for moisturizing and emollient properties in skin care — supported by mechanistic understanding of its fatty acid composition and regulatory review by the CIR. Anti-inflammatory, antinociceptive, antimicrobial, hypolipidemic, and antiviral activities have been demonstrated in cell cultures and animal models, but controlled human clinical trials have not been published for any therapeutic indication. The seed's widespread use as an oral weight-loss supplement is not supported by clinical evidence and is associated with documented risks of adverse gastrointestinal effects, electrolyte imbalance, potential hepatotoxicity at higher doses, and the serious hazard of adulteration with toxic botanical look-alikes.

References

Health Conditions

Health conditions that Kukui tree may help support.

No conditions available.

Body Systems

Body systems that Kukui tree may help support.

No body systems available.