# Corylus americana (American Hazelnut)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/corylus-americana
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Herb
**Also Known As:** American hazel, American filbert, wild hazelnut, native hazelnut, prairie hazelnut, beaked hazelnut

## Overview

Corylus americana is a wild-harvested nut native to eastern North America whose bark and leaves contain taxane-class diterpenoids, including precursors to paclitaxel, that disrupt microtubule dynamics in rapidly dividing cells. Its catechins, proanthocyanidins, and flavonols also upregulate superoxide dismutase activity, reducing [oxidative stress](/ingredients/condition/antioxidant) at the cellular level.

## Health Benefits

• Contains anticancer taxanes (paclitaxel precursors) that inhibit cancer cell proliferation - based on cellular studies only
• Demonstrates antioxidant effects by enhancing superoxide dismutase and reducing [reactive oxygen species](/ingredients/condition/antioxidant) - shown in HUVEC cell studies
• Exhibits [anti-inflammatory](/ingredients/condition/inflammation) properties by suppressing cytokines (NO, IL-1β, TNF-α, IL-6) - demonstrated in RAW264.7 macrophage cells
• May support gut health through [prebiotic](/ingredients/condition/gut-health) fiber effects on microbiota - based on related European hazelnut mouse studies
• Traditional use for pain relief in Swedish medicine - historical evidence only

## Mechanism of Action

Taxane diterpenoids found in Corylus americana bark bind to β-tubulin subunits of microtubules, stabilizing them against depolymerization and arresting mitosis at the G2/M phase, a mechanism analogous to pharmaceutical paclitaxel. Phenolic compounds including quercetin and catechins activate Nrf2/ARE signaling, upregulating endogenous antioxidant enzymes such as superoxide dismutase (SOD) and catalase while scavenging [reactive oxygen species](/ingredients/condition/antioxidant) (ROS). Anti-inflammatory activity is mediated in part through suppression of NF-κB translocation and downstream reduction of [pro-inflammatory cytokine](/ingredients/condition/inflammation)s including TNF-α and IL-6.

## Clinical Summary

Current evidence for Corylus americana is limited exclusively to in vitro and preclinical models; no human clinical trials have been published as of 2024. Cell-based studies using human umbilical vein endothelial cells (HUVECs) demonstrated measurable reductions in ROS and increases in SOD activity following treatment with hazelnut leaf and bark extracts. Anticancer activity has been observed in cancer cell line assays, but cytotoxic effects in isolated cell systems do not reliably predict therapeutic efficacy or safety in humans. The evidence base must be characterized as preliminary, and extrapolation to human dosing or clinical outcomes is not currently supported.

## Nutritional Profile

Corylus americana nuts provide a nutrient-dense profile similar to European hazelnuts (C. avellana) but with some compositional differences reflecting wild provenance. **Macronutrients (per 100 g dry kernel, approximate):** Fat: 55–65 g (predominantly monounsaturated oleic acid ~70–80% of total fatty acids; linoleic acid ~10–15%; palmitic acid ~5–7%; alpha-linolenic acid ~0.1–0.5%), Protein: 12–17 g (rich in arginine, glutamic acid, and aspartic acid), Carbohydrates: 10–17 g (dietary fiber: 8–11 g, including both soluble and insoluble fractions), Energy: ~600–650 kcal. **Minerals:** Manganese: 5–6 mg (high bioavailability as a cofactor for superoxide dismutase), Copper: 1.5–2.0 mg, Magnesium: 160–180 mg, Phosphorus: 280–320 mg, Potassium: 600–700 mg, Iron: 4–5 mg (non-heme, moderate bioavailability enhanced by co-present vitamin C in fresh catkins/leaves), Calcium: 110–140 mg, Zinc: 2.0–2.5 mg, Selenium: trace amounts (~2–4 µg). **Vitamins:** Vitamin E (primarily alpha-tocopherol: 15–25 mg/100 g, with smaller amounts of gamma-tocopherol ~1–3 mg; high bioavailability due to lipid matrix), Thiamine (B1): 0.4–0.6 mg, Riboflavin (B2): 0.1–0.15 mg, Niacin (B3): 1.5–2.0 mg, Folate: 70–115 µg, Vitamin B6: 0.5–0.6 mg, Vitamin K: ~14 µg. **Bioactive compounds:** Phenolic acids (gallic acid, caffeic acid, p-coumaric acid; total phenolics ~200–500 mg GAE/100 g in kernel, substantially higher in pellicle/skin up to 2000+ mg GAE/100 g), Proanthocyanidins (condensed tannins, concentrated in the brown skin/pellicle: 500–1500 mg/100 g skin), Flavonoids (quercetin, myricetin, and kaempferol glycosides: 10–50 mg/100 g in leaves and husks), **Taxol-related diterpenoids:** paclitaxel and 10-deacetylbaccatin III detected in bark, leaves, and shell tissues at trace levels (ng to low µg/g range; these are not present in significant quantities in the edible nut kernel itself), **Phytosterols:** beta-sitosterol (~100–130 mg/100 g), campesterol (~5–10 mg), stigmasterol (~2–5 mg) — phytosterols compete with cholesterol absorption with ~5–10% bioavailability. **Essential oil volatiles (husk/leaf):** include linalool, eugenol, and sesquiterpenes contributing to traditional aromatic and [antimicrobial](/ingredients/condition/immune-support) uses. **Bioavailability notes:** The high lipid content of the nut matrix enhances bioavailability of fat-soluble compounds (tocopherols, phytosterols, carotenoids). Phenolic compounds concentrated in the pellicle are partially bound to fiber and tannins, reducing gastrointestinal absorption to ~5–20%; roasting may increase free phenolic availability but reduces thermolabile vitamins. Mineral bioavailability is modestly reduced by phytic acid content (~0.2–0.5 g/100 g), which can be mitigated by soaking or fermentation.

## Dosage & Preparation

No clinically studied dosage ranges exist for Corylus americana due to lack of human trials. Cellular studies used extract concentrations of 6.25-160 μg/mL. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Corylus americana is a member of the Betulaceae family, and individuals with birch pollen or tree nut allergies face a significant risk of cross-reactive allergic responses, including oral allergy syndrome or anaphylaxis. Because taxane-class compounds share a mechanism with chemotherapy drug paclitaxel, concurrent use with oncology treatments or cytotoxic drugs warrants medical supervision to avoid additive or unpredictable interactions. No formal safety data exist for use during pregnancy or lactation, and it should be avoided in these populations until evidence is established. Standardized supplement dosages have not been clinically validated, making safe upper intake levels undefined.

## Scientific Research

No human clinical trials have been conducted specifically on Corylus americana. Related studies on European hazelnut (C. avellana) include mouse studies showing sex-dependent modulation of colonic microbiota (PMID: 36891893) and cellular studies demonstrating [antioxidant](/ingredients/condition/antioxidant) and [anti-inflammatory](/ingredients/condition/inflammation) effects (PMCID: PMC9929368).

## Historical & Cultural Context

Hazelnut leaf and bark from Corylus species have been used in traditional Swedish medicine to treat pain. Specific historical use of Corylus americana in Native American or other traditional systems is not documented in available research.

## Synergistic Combinations

European Hazelnut, Green Tea Extract, Turmeric, Resveratrol, Quercetin

## Frequently Asked Questions

### Does American hazelnut contain paclitaxel?

Corylus americana bark contains taxane diterpenoids that are biosynthetic precursors to paclitaxel (Taxol), not paclitaxel itself in therapeutic quantities. These compounds share the taxane scaffold and can inhibit microtubule depolymerization in cell studies, but the concentrations present in plant material are far lower than those used in pharmaceutical cancer treatment and have not been tested in humans.

### What antioxidants are found in American hazelnut?

American hazelnut leaves and nuts contain quercetin, kaempferol, catechins, proanthocyanidins, and chlorogenic acid, all of which contribute to antioxidant activity. HUVEC cell studies demonstrated that hazelnut extracts upregulate superoxide dismutase (SOD) and reduce intracellular reactive oxygen species (ROS), suggesting the phenolic fraction drives measurable antioxidant enzyme induction through Nrf2 pathway activation.

### Is American hazelnut safe for people with tree nut allergies?

American hazelnut poses a meaningful allergy risk for individuals sensitized to tree nuts or birch pollen due to shared allergen proteins, particularly Cor a 1 (a PR-10 protein homologous to Bet v 1 in birch). Reactions can range from oral allergy syndrome — tingling and swelling of the lips and mouth — to systemic anaphylaxis in highly sensitized individuals. Anyone with a documented tree nut or birch pollen allergy should avoid Corylus americana products without allergist guidance.

### Can American hazelnut supplements treat cancer?

No human clinical evidence supports the use of American hazelnut supplements to treat any form of cancer. Anticancer properties have been demonstrated only in vitro, where taxane precursors arrested cancer cell division at the G2/M phase in isolated cell lines. These findings are mechanistically interesting but cannot be extrapolated to clinical efficacy or safety without controlled human trials, which have not been conducted.

### How does American hazelnut differ from European hazelnut (Corylus avellana)?

Corylus americana is native to eastern North America and grows as a multi-stemmed shrub, while Corylus avellana is the European species cultivated commercially for hazelnuts. Phytochemically, both species contain overlapping flavonoids and proanthocyanidins, but Corylus americana bark is specifically noted as a source of taxane diterpenoids, a compound class not prominently reported in European hazelnut research. The nutritional nut profiles are broadly similar, but the medicinal phytochemistry of the bark and leaves differs meaningfully between species.

### What is the current clinical evidence status for American hazelnut supplements in humans?

Most research on American hazelnut's bioactive compounds (taxanes, antioxidants, anti-inflammatory agents) has been conducted in cell cultures and animal models rather than human clinical trials. While laboratory studies show promise for anticancer and anti-inflammatory effects, these findings have not yet been validated in controlled human studies, meaning efficacy in people remains unproven. More rigorous clinical research is needed before strong health claims can be made about American hazelnut supplements.

### What are the natural food sources of American hazelnut, and can I get therapeutic amounts from eating whole hazelnuts?

American hazelnut nuts are available as whole foods, particularly in North American regions, and can be consumed raw, roasted, or as nut butters. While whole American hazelnuts provide fiber, healthy fats, and some polyphenols, the concentrated bioactive compounds studied in research (such as taxane precursors) are typically found in higher amounts in specialized extracts used in supplement form. Dietary consumption of whole nuts offers nutritional benefits, but achieving the specific compound levels used in research studies would require supplement supplementation.

### How does American hazelnut supplementation affect people with existing inflammatory or autoimmune conditions?

Although laboratory studies demonstrate that American hazelnut exhibits anti-inflammatory effects by reducing cytokine production, there is no published clinical evidence specifically evaluating its use in people with inflammatory or autoimmune diseases. Individuals with these conditions should consult a healthcare provider before supplementing, as the interaction between hazelnut's compounds and existing medications or disease states has not been systematically studied. Self-treating inflammation with hazelnut supplements without medical guidance could potentially interfere with conventional treatment protocols.

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