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Hazelnuts

Corylus avellana

Also known as Filbert, Cobnut

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The round nut of the hazel shrub, mostly grown in Turkey and Italy and largely destined for confectionery. The USDA reference entry is for the raw kernel with its skin.

Heart HealthCirculationAntioxidant & Oxidative Stress

Potential health benefits

Best supported: Moderate

Ordered by how well the human research supports them — strongest first. A rating describes the state of the evidence, not how impressive the food is. How we rate evidence.

Blood lipid profile

Heart Health
Moderate evidence

Several trials report reduced LDL cholesterol with hazelnut-enriched diets, in line with the wider literature on monounsaturated-rich nuts, though hazelnut-specific trials are smaller and often industry-supported.

Moderate evidence. Several human studies point the same way, with real caveats.

3 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Endothelial function

Circulation
Limited evidence

Evidence is limited. A few small trials report improved vascular measures after hazelnut-enriched diets, with short duration and few participants.

Limited evidence. Early human work, or mostly lab and animal research.

4 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Oxidative stress markers

Antioxidant & Oxidative Stress
Limited evidence

Evidence is limited to small trials measuring antioxidant and oxidised-LDL markers, mostly using skin-on hazelnuts, which are not the form most people eat.

Limited evidence. Early human work, or mostly lab and animal research.

3 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Ask about Hazelnuts

Ask about Hazelnuts

Answers are written only from the entries on this page — the same nutrients, compounds, claims and citations you can read above. Nothing is added from outside the database, and every answer lists what it was built from.

AI explanations are not switched on for this site, so there is nothing to ask here. Everything above is read straight from the database and does not need them.

Key nutrients

Nutrient content per 100 grams
NutrientAmount% DV
Macronutrients
Calories628 kcal31%
Protein14.9 g30%
Total fat60.8 g78%
Carbohydrate16.7 g6%
Fibre9.7 g35%
Total sugars4.34 g—
Water5.31 g—
Fats
Saturated fat4.46 g22%
Monounsaturated fat45.7 g—
Polyunsaturated fat7.92 g—
Cholesterol0 mg0%
EPA (omega-3)0 g—
DHA (omega-3)0 g—
DPA (omega-3)0 g—
Linoleic acid (omega-6)7.83 g—
Vitamins
Vitamin A1 µg0%
Vitamin C6.3 mg7%
Vitamin D0 µg0%
Vitamin E15 mg100%
Vitamin K14.2 µg12%
Thiamin (B1)0.643 mg54%
Riboflavin (B2)0.113 mg9%
Niacin (B3)1.8 mg11%
Pantothenic acid (B5)0.918 mg18%
Vitamin B60.563 mg33%
Folate113 µg28%
Vitamin B120 µg0%
Choline45.6 mg8%
Minerals
Calcium114 mg9%
Iron4.7 mg26%
Magnesium163 mg39%
Phosphorus290 mg23%
Potassium680 mg14%
Sodium0 mg0%
Zinc2.45 mg22%
Copper1.73 mg192%
Manganese6.17 mg268%
Selenium2.4 µg4%
Other measured compounds
Beta-carotene11 µg—
Alpha-carotene3 µg—
Lycopene0 µg—
Lutein + zeaxanthin92 µg—
Caffeine0 mg—
Ash2.29 g—

Nutrient values are per 100 g of the USDA reference entry named on this page and vary with variety, growing conditions, storage and preparation.

Source record: Nuts, hazelnuts or filberts (USDA FoodData Central, FDC ID 170581).

% DV uses the FDA Daily Values for adults and children aged 4 and over. A dash means no Daily Value has been established for that nutrient.

Bioactive compounds

Compounds present in meaningful amounts. Presence is banded rather than quantified, because whole-food levels vary enormously with variety, growing conditions, storage and preparation.

How preparation changes things

Only effects with real support are listed. If a preparation method is missing, it is because nothing dependable is documented — not because it makes no difference.

  • roastedReduces skin polyphenols

    Roasting loosens and removes the polyphenol-rich skin, which is standard practice in confectionery and removes most of the phenolic content of the nut.

Things to know

Allergies, interactions and intake concerns. Every food gets this section — a reference where everything is uniformly good is not a reference.

  • Allergy

    Tree nut allergy

    Hazelnut is a major regulated allergen and one of the most common nut allergies in Europe. Many hazelnut reactions are mild oral allergy syndrome driven by cross-reactivity with birch pollen, but primary hazelnut allergy causing anaphylaxis also occurs.

  • Worth knowing

    Aflatoxin controls

    Hazelnuts are among the commodities most frequently rejected at import for aflatoxin contamination, which is why sourcing and storage matter.

  • Worth knowing

    Usually eaten with chocolate and sugar

    The overwhelming majority of hazelnuts are consumed in spreads and confectionery. Research on hazelnuts as a food says nothing about those products.