IngredientsGevuina avellana, commonly known as the Chilean hazelnut (avellano chileno in Spanish) or Gevuina hazelnut, is an evergreen tree growing up to 20 meters (65 feet) tall. It is the only species currently classified in the genus Gevuina and is native to southern Chile and adjacent valleys in Argentina. The genus Gevuina belongs to the family Proteaceae.
The name Gevuina comes from guevin, the Mapuche Indigenous name for the Chilean hazel. The origin of the Spanish common name avellano comes from the fact that Spanish settlers found the nuts similar to the hazelnuts (Corylus avellana) they knew from Europe. Despite this superficial resemblance, the Chilean hazelnut is not a hazelnut at all, but is in fact closely related to macadamia nuts.
It is a popular plant with many names including Chile hazel, Chilean hazel, Chilean hazelnut, Chilean wild nut, Gevuina nut, Hardy macadamia, and Chilean nut. In the cosmetics and supplement industry, the seed oil is listed under its INCI name Gevuina Avellana Seed Oil.
In some classifications, the genus is recognised with three species — one endemic to Australia (Gevuina bleasdalei), another to New Guinea (Gevuina papuana), and one species in Chile (Gevuina avellana). Other taxonomic reports place the Australian and New Guinea species in the genus Bleasdalea or in the Fijian endemic genus Turrillia, leaving Gevuina with only Gevuina avellana.
Gevuina avellana is a medium-sized evergreen tree, 10–12 m, rarely over 15 m high; canopy compact but much more open under shady conditions; branches stout, pubescent; young shoots covered in dense reddish hair. Leaves are large, bipinnate, leaflets glossy, coriaceous dark green with serrated margins. The inflorescence is racemose, flowers snow- to ivory-white, borne on the outside of the canopy in pairs; tepals 4, fused into a single structure with stamens curving back at anthesis to reveal the simple style and ovary.
The fruit is a globose, woody drupe derived from an indehiscent follicle; 1.2–2.3 cm in diameter, coral-red when mature, then turning brown or black. The seed is solitary, globular, with a smooth, tough shell. The species is found from sea level to 700 meters (2,300 feet) above sea level, and its distribution extends from 35° to 44° south latitude.
G. avellana is an understorey tree common in the Valdivian forests of southern Chile. These diverse subantarctic forests show many Gondwana affinities. It grows from the snowline of the Pacific slopes of the Andes to the coast in areas that have a Mediterranean (mild moist temperate maritime) climate, with occasional radiation freezes in spring and autumn, as well as winter frosts.
It is cultivated as a seed crop in its native Chile and also in New Zealand, and is often grown as an ornamental, being especially valued for its decorative foliage. Gevuina is a little-known proteaceous tree nut from southern Chile and Argentina, similar in quality to the macadamia — the nut with the fastest export growth at the time of early research. Unlike the subtropical macadamia, Gevuina prospers in cooler oceanic climates.
The nut and its derivatives appear in several distinct forms:
The Mapuche people, who call the avellana gevuÃn or gneufén, have consumed the nuts since precolonial times. The plant grows from Chile's temperate coast up the Pacific slope of the Andes to 700 meters above sea level. For centuries, indigenous Mapuche communities have utilized Gevuina avellana nuts as a dietary staple, but also as a remedy for various ailments, including the consumption of the raw or roasted nuts to boost energy and improve overall vitality.
A published ethnobotanical survey of Mapuche traditional medicine in AraucanÃa, Chile, documented the use of the avellano bark in traditional healing practice: under its Mapuche name Ngefun, Guevina avellana (avellano) was used in a cooked preparation of the cortex for the treatment of nervousness.
The oil extracted from the seeds, rich in monounsaturated fatty acids and antioxidants, was used topically to soothe skin irritations, wounds, and burns, and orally to support cardiovascular health and aid digestion. In folk medicine, Gevuina avellana was often combined with other native herbs to enhance its health benefits — for example, mixtures with Boldo (Peumus boldus) or Quillay (Quillaja saponaria) were believed to promote liver function and support detoxification.
The nuts are consumed raw, boiled, or toasted. Traditionally, avellana nuts are roasted in a wood stove or callana (a Mapuche vessel used to roast grain) to impart a light sweet and slightly spicy flavor. Roasted avellana is added to chocolates, cookies, biscuits, and alcoholic beverages. The nuts can also be candied or turned into nut butter or flour. Ground avellana is brewed to make a local drink similar to coffee.
The tannins in the nuts' shells are used for tanning leather. The Slow Food Foundation's Ark of Taste has recognized the avellana as a traditional food product of Chile, underscoring its cultural significance and the conservation concerns surrounding it.
The genus Gevuina was first formally described in 1782 through the publication of Gevuina avellana by Juan Ignacio Molina in Saggio sulla Storia Naturale del Chili. Since the colonial period, the nut has been an economic resource gathered from wild stands in rural southern Chile, and gathering fruits from wild Chilean hazelnuts is a relevant economic activity in the rural areas of central and southern Chile.
Avellana is rich in protein, monounsaturated oils, vitamin E, and β-carotene. Whole-nut proximate analysis (reported for the raw seed) indicates approximately 12.5% protein, 49.5% oils, and 24.1% carbohydrates. The defatted meal of G. avellana contains 20% protein, which can be used for food and feed purposes due to its composition and biological value.
The seed oil of G. avellana is one of its most chemically distinctive features and the primary focus of scientific characterization. This stable oil is composed of more than 85% monounsaturated fatty acids and about equal amounts (6%) of saturated and polyunsaturated (principally linoleic) fatty acids.
The main fatty acids are oleic and 7-hexadecenoic acids. Published GC-MS profiling reports oleic acid (C18:1Δ9) as the predominant component at approximately 35%, with palmitoleic acid (C16:1) — which exists in unusually high proportions compared to most vegetable oils — also a major constituent. The hexadecenoic fatty acid (C16:1) content showed values ranging between 21.73% and 23.72% among clones.
A particularly notable chemical feature is the presence of unusual positional isomers of monounsaturated fatty acids. These include C16:1 Δ11, C18:1 Δ12, C20:1 Δ11, C20:1 Δ15, C22:1 Δ17, and presumably C22:1 Δ19 — with C18:1 Δ12 and C22:1 Δ19 described for the first time in G. avellana seed oil. Twelve cis-MUFAs were detected in the nut oil, and the oil is composed of a great amount of unusual cis-MUFAs having between 14 to 24 carbons, with four different groups (C16, C18, C20, and C22).
While only minute quantities of α- and γ-tocopherols and β-, γ- and δ-tocotrienols were found, the oil contained a substantial amount of α-tocotrienol at 130 mg/kg. This is confirmed by clone-level analysis: a significant level of α-tocotrienol was determined, ranging from 63.41 to 163.74 μg/g among clones. α-Tocotrienol is a form of vitamin E with potent antioxidant properties. The seed is rich in antioxidants such as vitamin E (α-tocotrienol) and β-carotene.
Hydroxybenzoic and hydroxycinnamic acids are the main phenolic compound classes detected in the cotyledons. More specifically, HPLC-DAD analysis of the phenolic-enriched extract identified caffeic acid hexoside, hydroxymethylfurfural, phenyl caffeate, hydroxybenzoic acid, and sinapic acid hexoside.
Eight phytoprostanes and three phytofurans were identified and quantified in the cotyledon oil. Phytoprostanes and phytofurans are non-enzymatic oxidation products of α-linolenic acid, with potential roles as bioactive lipid mediators.
In general, the phenolic content was low, and consequently the antioxidant activity of the samples was moderate to low. Seventeen compounds were detected in the phenolic-enriched extracts from the samples, most of them derived from caffeic, benzoic, and ferulic/isoferulic acids.
A 2020 study published in Scientific Reports (PMC) reported a novel class of compounds: the isolation and full characterization of a cyclic dipeptide cyclo(Arg-Trp) and other compounds from the phenolic-enriched extracts of the G. avellana cotyledons. Compounds were isolated by means of counter-current chromatography and structures were established by spectroscopic and spectrometric methods. This is the first report on small peptides in G. avellana and adds evidence on the possible beneficial effects of this nut in human health. Cyclo(Arg-Trp) is a diketopiperazine (cyclic dipeptide formed from arginine and tryptophan), a class of compounds found across diverse organisms and studied for various biological activities, though the specific health implications in humans remain to be established.
The protein concentration after oil extraction has been found to be 16%. Of the 18 amino acids found in the flour, glutamic acid, followed by aspartic acid and arginine, are present in the greatest concentrations; lysine is the only limiting essential amino acid when compared with the FAO/WHO standards. In general, Gevuin is similar to hazelnut in its proximate chemical constitution and mineral content, and also to other nuts from temperate and subtropical climates such as pecan, English walnut, and pistachio.
Antioxidant capacity has been documented in both the oil and the defatted seed extracts. The antioxidant activity of the butanol and methanol extracts from G. avellana seeds, evaluated by the β-carotene assay and hydrogen radical scavenging ability, was comparable to those of the synthetic antioxidants butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT). However, the DPPH radical scavenging activity of the G. avellana methanol, ethanol, and water extracts was 2–3 times lower than those of BHT and BHA, respectively. The antioxidant capacity is attributed primarily to the polyphenolic compounds in the defatted meal and to α-tocotrienol in the oil.
Oils showed antioxidant activity determined by electron paramagnetic resonance (EPR), and inhibition of COX-1/COX-2.
One of the more systematically studied in vitro mechanisms involves the inhibition of enzymes linked to metabolic syndrome. Researchers assessed the inhibition of α-glucosidase, α-amylase, lipase, cyclooxygenases-1 and -2 (COX-1/COX-2), and lipoxygenase. The phenolic-enriched extracts of the cotyledons were assessed on enzymes associated with metabolic syndrome. Inhibition of α-glucosidase and α-amylase is relevant to modulation of post-prandial blood glucose, while inhibition of lipase has implications for fat digestion, and COX inhibition relates to anti-inflammatory mechanisms. These findings are from in vitro assays only and have not been replicated in human clinical settings.
The unusually high content of palmitoleic acid is associated with UV-filtering characteristics. The oil is particularly high in palmitoleic acid (up to 27.6%), which is a good natural UV filter for sun protection. The physical and chemical characteristics of the nut oil have potential uses as skin care, for restoring treatments (turgor, elasticity, wound healing), and as UV radiation filter. Gevuina oil has an absorbance range starting at 350 nm up to a maximum at 250 nm, with a peak around 280 to 260 nm, with differential responses among clones. These measurements are based on spectrophotometry of the oil itself; no controlled clinical SPF studies in human subjects were identified.
The nut oil can be processed for valuable edible and cosmetic oil due mainly to its UV filtering properties and to its good penetrating ability, attributed to the high palmitoleic acid content (37% of the fatty acids content in some analyses). It is absorbed well by the skin because its fatty acid structure is similar to the composition of lipids in the skin.
The Rancimat induction period at 110°C is 20 hours, indicating exceptionally high oxidative stability compared with most vegetable oils. This stability is largely attributed to the low content of polyunsaturated fatty acids and the substantial α-tocotrienol content.
Important context: The great majority of published scientific work on G. avellana consists of compositional chemistry studies, in vitro enzyme assays, and ex situ clonal selection research. As of the most recent available literature, clinical trials evaluating direct health effects in humans remain limited. The following sections characterize available evidence and its strength honestly.
In vitro / compositional evidence: Researchers determined the inhibition of α-glucosidase, α-amylase, lipase, COX-1/COX-2, and lipoxygenase. The main fatty acids in the cotyledons were oleic and 7-hexadecenoic acids. The oil's composition — dominated by monounsaturated fatty acids — has drawn comparisons to olive oil, with which high MUFA intake is epidemiologically associated with favorable cardiometabolic outcomes. However, preliminary in vitro and animal studies suggest anti-inflammatory and cholesterol-lowering properties, but robust human data are still needed to substantiate these claims.
Evidence strength: Weak to preliminary. All mechanistic data in this domain are from in vitro enzyme inhibition studies. No randomized controlled trials (RCTs) or prospective human studies have been published on G. avellana and metabolic or cardiovascular outcomes.
In vitro evidence: The radical-scavenging activities of the extracts were comparable to that of BHA when used at the same concentration. The phenolic-enriched extract from cotyledons showed antioxidant activity against multiple radicals. Hull extracts also demonstrated significant free-radical scavenging capacity in standardized assays.
Evidence strength: Preliminary. Antioxidant activity is demonstrated consistently in vitro using DPPH, EPR, and β-carotene bleaching assays, but this does not directly translate to antioxidant efficacy in vivo. No human bioavailability or clinical antioxidant studies have been published.
In vitro evidence: Oils showed antioxidant activity determined by EPR, and inhibition of COX-1/COX-2. COX-1 and COX-2 are the enzymes targeted by non-steroidal anti-inflammatory drugs (NSAIDs). Inhibition of these enzymes in cell-free in vitro assays by the oil fraction suggests a plausible anti-inflammatory mechanism, likely mediated by fatty acid composition and tocotrienol content.
Evidence strength: Very preliminary (in vitro only). No animal studies or human trials on inflammatory markers have been identified.
This is the area with the most applied research, though it remains largely in the realm of compositional characterization and analytical chemistry. The physical and chemical characteristics of the nut oil have potential uses as skin care, for restoring treatments (turgor, elasticity, wound healing), and as UV radiation filter.
Research programmes on Gevuina avellana have developed genotypes with interesting results for phytotherapy and cosmetic purposes. UV spectrophotometry studies of the oil confirmed its UV-absorbing properties, supporting its inclusion in cosmetic sunscreen formulations as a supplementary natural ingredient. Both oil from G. avellana and from R. rubiginosa possess skin regenerating or protecting properties.
Evidence strength: Moderate for cosmetic/topical application based on chemical characterization, in vitro antioxidant data, and UV spectrophotometry — but no published double-blind, controlled human trials on skin outcomes were identified.
Coupled with its low fat and high fibre content, gevuina flour has prospects as a health food. The amino acid profile has been compared favorably to other nuts and meets FAO/WHO reference standards for essential amino acids with the exception of lysine. These are compositional findings; no clinical intervention studies on the defatted flour as a protein supplement were identified.
Evidence strength: Nutritional characterization is well established from multiple independent analytical studies. Clinical evidence for specific health outcomes from gevuina flour supplementation is absent.
There are no standardized clinical dosage recommendations for Chilean wildnut as a dietary supplement, as no dose-finding or dose-response human clinical trials have been published. The following forms and quantities are drawn from the available scientific literature:
As no controlled human studies have specified effective or safe dosages, any dosage information from commercial products cannot be attributed to clinical evidence.
Gevuina avellana nuts have a documented history of safe consumption as a traditional food among Mapuche populations and in southern Chilean cuisine going back centuries. The seeds are eaten raw, cooked in boiling water, or toasted. No reports of acute toxicity from nut consumption were identified in the peer-reviewed literature reviewed.
Statistical analysis showed that roasting does not affect the composition of the samples — an important finding confirming that the fatty acid, oxylipin, and phenolic profiles are not significantly altered by typical thermal processing.
The seed oil is registered in the EU cosmetics database with COSING REF No. 56171, and CAS number 225234-02-6. No significant safety concerns have been documented in the published literature for topical use in normal populations. The high oxidative stability of the oil (Rancimat induction period at 110°C: 20 hours) is a favorable safety characteristic for topical products, reducing the risk of rancidity and pro-oxidant degradation products on the skin.
Although G. avellana is botanically distinct from true hazelnuts (Corylus avellana), it is a tree nut in the family Proteaceae, closely related to macadamia. Individuals with tree nut allergies should exercise caution. No specific allergen characterization studies for G. avellana proteins were identified in the peer-reviewed literature, meaning cross-reactivity profiles with common tree nut allergens have not been formally established.
Lysine is the only limiting essential amino acid in gevuina flour when compared with the FAO/WHO standards. This is a nutritional consideration for populations relying heavily on the nut as a protein source, particularly without complementary dietary protein sources rich in lysine.
No published pharmacokinetic studies, drug interaction trials, or interaction case reports involving G. avellana preparations and pharmaceutical agents were identified. Given the absence of human clinical trials, formal interaction data do not exist. The presence of COX-inhibiting compounds in the oil fraction, demonstrated in vitro, theoretically suggests caution in concurrent use with NSAIDs or anticoagulant therapies, but this has not been studied in vivo.
Given its limited geographic distribution, habitat loss due to logging, agriculture, and urbanization poses a threat to Gevuina avellana. Conservation efforts are important to preserve this species in its natural habitat. The Slow Food Foundation's Ark of Taste recognition reflects concerns about the narrowing of wild populations and the cultural knowledge surrounding its traditional use.
Health conditions that Chilean wildnut may help support.
Body systems that Chilean wildnut may help support.
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