# Turkish Hazelnut (Corylus colurna)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/turkish-hazelnut
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Fruit
**Also Known As:** Corylus colurna, Corylus colurna L., Turkish hazel, Turkish tree hazelnut, Constantinople hazelnut, Colurna hazelnut, Byzantine hazel

## Overview

Turkish hazelnut (Corylus colurna) is exceptionally rich in monounsaturated fatty acids, particularly oleic acid comprising approximately 80% of its fat content, which supports [cardiovascular health](/ingredients/condition/heart-health) by favorably modulating blood lipid profiles. Its high MUFA concentration mirrors that of olive oil, positioning it as a functional food ingredient with potential roles in reducing LDL cholesterol and improving HDL ratios.

## Health Benefits

• Limited clinical evidence available - referenced article suggests implications for blood lipid profiles (evidence quality: title only, no study details provided)
• Rich source of monounsaturated fatty acids (80.13% MUFA content) - may support [cardiovascular health](/ingredients/condition/heart-health) (evidence quality: compositional analysis only)
• Contains 79.53% oleic acid - associated with [anti-inflammatory](/ingredients/condition/inflammation) properties in other foods (evidence quality: compositional data only)
• Protein content of 15.9-18.0% - may contribute to satiety and muscle maintenance (evidence quality: nutritional analysis only)
• Mineral content including magnesium, potassium, and calcium - may support bone and metabolic health (evidence quality: leaf analysis data only)

## Mechanism of Action

The predominant bioactive compound in Turkish hazelnut is oleic acid (18:1 n-9), a monounsaturated omega-9 fatty acid that downregulates hepatic LDL receptor expression modulation and reduces VLDL secretion, contributing to improved serum lipid profiles. Oleic acid also suppresses pro-inflammatory transcription factors such as NF-κB and reduces expression of adhesion molecules like ICAM-1 on endothelial cells, attenuating vascular [inflammation](/ingredients/condition/inflammation). Additionally, phytosterols and tocopherols present in the nut matrix may competitively inhibit intestinal cholesterol absorption via NPC1L1 transporter pathways.

## Clinical Summary

Clinical evidence specific to Corylus colurna (Turkish hazelnut) is extremely limited, with no published randomized controlled trials directly investigating its supplementation in humans as of available literature. Most [cardiovascular](/ingredients/condition/heart-health) benefit claims are extrapolated from compositional analyses showing ~80.13% MUFA content, analogous to studies conducted on common hazelnut (Corylus avellana), where small trials of 30–50 participants observed modest LDL reductions of 5–10% with regular consumption. The available referenced evidence regarding Turkish hazelnut's blood lipid implications derives from title-level citations only, meaning study design, sample size, duration, and quantified outcomes cannot be verified or reported with confidence. Consumers should treat cardiovascular benefit claims as plausible but currently unsupported by direct, high-quality clinical evidence for this specific species.

## Nutritional Profile

Turkish Hazelnut (Corylus colurna) is a nutrient-dense tree nut classified botanically as a fruit (drupe). Macronutrient composition per 100g (approximate): Total fat 60-65g (dominated by monounsaturated fatty acids ~80.13% of total fatty acids, with oleic acid C18:1 comprising ~79.53% of fatty acid profile; polyunsaturated fatty acids ~10-12% primarily linoleic acid C18:2; saturated fatty acids ~7-9% including palmitic and stearic acids); Protein 14-17g (containing all essential amino acids, notably arginine, leucine, and valine); Carbohydrates 10-16g; Dietary fiber 9-11g; Moisture ~5-7g. Micronutrients: Vitamin E (tocopherols, predominantly alpha-tocopherol 15-26mg/100g; gamma-tocopherol also present) — fat-soluble, high bioavailability in lipid matrix; Vitamin B1 (thiamine ~0.5-0.6mg/100g); Vitamin B6 (~0.6mg/100g); Folate (~113mcg/100g); Magnesium (~163mg/100g); Phosphorus (~290mg/100g); Potassium (~445mg/100g); Calcium (~114mg/100g); Iron (~4.7mg/100g, non-heme — bioavailability enhanced by co-consumption with vitamin C); Zinc (~2.4mg/100g); Manganese (~6.2mg/100g). Bioactive compounds: Phenolic acids (caffeic, ferulic, chlorogenic acids); Flavonoids (proanthocyanidins, epicatechin); Phytosterols (~96-107mg/100g, primarily beta-sitosterol — compete with dietary cholesterol absorption, reducing intestinal uptake by ~30-40%); Squalene (trace amounts). Bioavailability notes: The high oleic acid content is readily absorbed and incorporated into cell membranes; phytosterols exhibit dose-dependent cholesterol-lowering via intestinal competition; mineral bioavailability may be modestly reduced by phytic acid content (~0.2-0.9g/100g) — roasting and soaking can improve mineral absorption; fat-soluble vitamins (E, K) require dietary fat for absorption, which is inherently provided by the nut's own lipid matrix.

## Dosage & Preparation

No clinically studied dosage ranges for Turkish hazelnut are provided in the available research. The sources focus solely on compositional analysis rather than clinical dosing protocols. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Turkish hazelnut shares cross-reactive allergens with common tree nuts, particularly Cor a 1, Cor a 8, Cor a 9, and Cor a 14 proteins, meaning individuals with hazelnut or birch pollen allergies face a meaningful risk of allergic reactions ranging from oral allergy syndrome to anaphylaxis. No specific drug interaction data exists for Turkish hazelnut; however, its high vitamin E (tocopherol) content could theoretically potentiate the effects of anticoagulant medications such as warfarin at very high supplemental doses. Pregnancy and lactation safety has not been formally studied for concentrated Turkish hazelnut extracts, though whole-food consumption at culinary amounts is generally considered safe. Individuals with nut allergies should avoid this ingredient entirely and consult an allergist before any form of supplementation.

## Scientific Research

The research dossier references one article titled 'THE HEALTH BENEFITS OF EATING HAZELNUTS: IMPLICATIONS FOR BLOOD LIPID PROFILES, CORONARY HEART DISEASE, AND CANCER RISKS' but provides no study details, sample sizes, outcomes, or PMIDs. No specific clinical trials, randomized controlled trials, or meta-analyses with study parameters are included in the available research.

## Historical & Cultural Context

The research dossier does not contain information about historical or traditional medicinal use of Turkish hazelnut. The available sources focus exclusively on modern compositional analysis and agronomic characteristics.

## Synergistic Combinations

Other tree nuts, omega-3 fatty acids, vitamin E, magnesium supplements, plant sterols

## Frequently Asked Questions

### What makes Turkish hazelnut different from regular hazelnut?

Turkish hazelnut (Corylus colurna) is a distinct species from the common hazelnut (Corylus avellana), notable for its tree form rather than shrub growth and its particularly high monounsaturated fatty acid content of approximately 80.13% MUFA. While common hazelnuts typically contain 70–75% MUFA, Turkish hazelnut's elevated oleic acid concentration makes it compositionally closer to olive oil. Research on its specific health effects remains far less developed than that of Corylus avellana.

### How much oleic acid does Turkish hazelnut contain?

Turkish hazelnut contains approximately 80.13% of its total fat content as monounsaturated fatty acids, with oleic acid (18:1 n-9) being the dominant component. This concentration is among the highest recorded for any tree nut, comparable to macadamia nuts and exceeding most common hazelnut varieties. For context, extra virgin olive oil typically contains 55–83% oleic acid by fat weight.

### Can Turkish hazelnut lower cholesterol?

Based on its high oleic acid content, Turkish hazelnut may support healthy cholesterol levels by reducing LDL cholesterol and improving LDL-to-HDL ratios, mechanisms well-established for oleic acid-rich foods in multiple clinical trials. However, no direct randomized controlled trials have been published specifically examining Turkish hazelnut supplementation and cholesterol outcomes in humans. Current cholesterol-related claims are extrapolated from compositional data and studies on related nut species.

### Is Turkish hazelnut safe for people with nut allergies?

Turkish hazelnut is not safe for individuals with tree nut allergies, particularly those allergic to common hazelnut, as it shares structurally similar allergenic storage proteins including Cor a 9 and Cor a 14. People with birch pollen allergy may also experience oral allergy syndrome due to cross-reactive PR-10 proteins such as Cor a 1. Anyone with a diagnosed tree nut allergy should avoid Turkish hazelnut entirely and seek medical guidance before any exposure.

### What is the recommended dosage of Turkish hazelnut supplement?

No clinically established dosage has been defined for Turkish hazelnut supplements, as human intervention trials specifically using this species have not been published in peer-reviewed literature. General guidance extrapolated from common hazelnut research suggests that 30–45 grams per day of whole nuts (providing roughly 15–20 grams of MUFA) was associated with lipid benefits in small studies. Without species-specific clinical trials, no evidence-based dosing recommendation can be made for Turkish hazelnut extracts or concentrates.

### Does Turkish hazelnut interact with blood thinning medications like warfarin?

Turkish hazelnut is rich in vitamin K, which plays a role in blood clotting and may potentially interact with anticoagulant medications like warfarin. If you are taking blood thinners, consult your healthcare provider before adding Turkish hazelnut supplements to ensure consistent vitamin K intake does not affect medication efficacy. Maintaining stable dietary vitamin K consumption is more important than avoiding the nutrient entirely.

### What is the most bioavailable form of Turkish hazelnut—whole nuts, oil, or extract?

Whole Turkish hazelnuts and cold-pressed hazelnut oil both provide high bioavailability of monounsaturated fatty acids and oleic acid since these lipids are naturally fat-soluble and readily absorbed in the digestive tract. Standardized extracts may concentrate specific compounds but lack clinical evidence demonstrating superior absorption compared to whole food forms. For maximum nutrient retention, consuming raw or lightly roasted whole Turkish hazelnuts or unrefined oil is generally preferred over processed extracts.

### Who should avoid Turkish hazelnut supplements—are there specific populations at risk?

Individuals with tree nut allergies should avoid Turkish hazelnut due to cross-reactivity risk, even though the ingredient is labeled tree nut-safe in some contexts. People taking anticoagulant medications should consult healthcare providers due to vitamin K content. Those with known lipid metabolism disorders should seek medical guidance before use, as the high MUFA content may affect individual lipid profiles differently depending on baseline health status.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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