# Red Walnut (Juglans regia 'Robert Livermore')

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/red-walnut
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-03
**Evidence Score:** 2 / 10
**Category:** Other
**Also Known As:** Robert Livermore walnut, Red English walnut, Red pellicle walnut, Burgundy walnut, Purple kernel walnut, Anthocyanin-rich walnut

## Overview

Red Walnut (Juglans regia 'Robert Livermore') is a cultivar distinguished by elevated anthocyanin pigments concentrated in its red pellicle, which provide measurable antioxidant activity via [free radical scaveng](/ingredients/condition/antioxidant)ing. It also supplies alpha-linolenic acid (ALA) at approximately 14% of fatty acid content, an omega-3 precursor to EPA and DHA.

## Health Benefits

• No clinical evidence exists specifically for Red Walnut cultivar - general walnut studies cannot be extrapolated to this variety
• Contains high anthocyanin content in red pellicle providing [antioxidant activity](/ingredients/condition/antioxidant) (no human studies available)
• Provides omega-3 fatty acids (14% alpha-linolenic acid) supporting general [anti-inflammatory](/ingredients/condition/inflammation) effects seen in walnuts (no Red Walnut-specific trials)
• Rich in polyunsaturated fatty acids (72% of total fats) including 58% linoleic acid (nutritional profile data only)
• Contains vitamin E, copper, selenium, iron, and niacin (compositional analysis only, no clinical outcomes measured)

## Mechanism of Action

Anthocyanins in the red pellicle — primarily cyanidin-3-glucoside and related glycosides — neutralize [reactive oxygen species](/ingredients/condition/antioxidant) and may inhibit NF-κB signaling, reducing [pro-inflammatory cytokine](/ingredients/condition/inflammation) expression. Alpha-linolenic acid (ALA) undergoes enzymatic conversion via delta-6-desaturase and elongase enzymes toward EPA and DHA, which modulate eicosanoid synthesis and reduce arachidonic acid-derived inflammatory mediators. These compounds may also upregulate Nrf2/ARE pathway activity, promoting endogenous antioxidant enzyme production including superoxide dismutase and catalase.

## Clinical Summary

No clinical trials have been conducted specifically on the Juglans regia 'Robert Livermore' cultivar, making direct evidence-based claims impossible. General walnut research — such as the PREDIMED substudy (n=7,216) and various randomized controlled trials using 28–60g/day of mixed walnut varieties — demonstrates [cardiovascular](/ingredients/condition/heart-health) and lipid benefits, but these results cannot be extrapolated to this cultivar due to differing phytochemical profiles. Anthocyanin research from other red-pigmented foods suggests [antioxidant](/ingredients/condition/antioxidant) and endothelial benefits, but no dose-response data exists for Red Walnut specifically. The overall evidence base for this cultivar is currently theoretical and preclinical.

## Nutritional Profile

Red Walnut (Juglans regia 'Robert Livermore') shares the base macronutrient profile of English walnuts with cultivar-specific anthocyanin enrichment. Per 100g edible kernel (estimated from comparable walnut cultivar data): Calories ~654 kcal; Total fat ~65g (polyunsaturated 47g including omega-6 linoleic acid ~38g and omega-3 alpha-linolenic acid ~14g; monounsaturated ~9g; saturated ~6g); Protein ~15g (complete amino acid profile including arginine ~2.3g); Carbohydrates ~14g; Dietary fiber ~6.7g. Micronutrients per 100g: Magnesium ~158mg (40% DV); Phosphorus ~346mg (28% DV); Potassium ~441mg (9% DV); Copper ~1.6mg (178% DV); Manganese ~3.4mg (148% DV); Zinc ~3.1mg (28% DV); Iron ~2.9mg (16% DV); Selenium ~4.9mcg; Vitamin E (gamma-tocopherol) ~21mg (alpha-tocopherol ~0.7mg); Folate ~98mcg (25% DV); Vitamin B6 ~0.54mg; Thiamine ~0.34mg. Distinctive bioactive compounds: Anthocyanins concentrated in the red pellicle (inner skin) estimated at 150-300mg/100g dry weight — primarily cyanidin-3-glucoside and cyanidin-3-rutinoside, significantly elevated versus standard English walnut cultivars (~10-30mg/100g); Ellagitannins (pedunculagin, tellimagrandin) ~3-4g/100g converted to urolithins by gut microbiota with variable bioavailability (urolithin production is [microbiome](/ingredients/condition/gut-health)-dependent, estimated 30-50% population are efficient converters); Juglone ~0.02-0.05mg/100g; Melatonin ~3.5ng/g; Polyphenols total ~1600mg GAE/100g (higher than standard walnuts due to anthocyanin content). Bioavailability notes: ALA conversion to EPA/DHA is limited (~5-10% to EPA, <1% to DHA) making it a modest omega-3 source; anthocyanin bioavailability from nut pellicle is low (~1-5% absorption) but metabolites show activity; fat-soluble compounds (tocopherols, polyphenols) benefit from co-consumption with dietary fat already present in the nut matrix; mineral absorption may be partially inhibited by phytic acid content (~760mg/100g).

## Dosage & Preparation

No clinically studied dosage ranges are available for Red Walnut due to absence of human trials. General walnut consumption guidelines suggest 28-42g/day (1-1.5 oz, approximately 14 halves) based on observational data for omega-3 intake, not specific to this cultivar. Available forms include whole kernels or ground preparations with up to 18-month shelf life. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Red Walnut shares the general safety profile of tree nuts; the primary risk is IgE-mediated tree nut allergy, which can cause reactions ranging from oral allergy syndrome to anaphylaxis and warrants strict avoidance in sensitized individuals. Juglone, a naphthoquinone present in walnut species, is found at low levels in the edible kernel but may interact with cytochrome P450 enzymes, potentially altering [metabolism](/ingredients/condition/weight-management) of certain drugs including warfarin — patients on anticoagulants should consult a physician. High ALA intake (exceeding 3g/day from all sources) may theoretically affect platelet aggregation, adding modest bleeding risk when combined with antiplatelet medications. Pregnancy safety follows general nut consumption guidelines; moderate culinary intake is considered safe, but concentrated extracts lack reproductive safety data.

## Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses specific to Red Walnut (Juglans regia 'Robert Livermore') were identified. General walnut studies exist (e.g., PMID 29494201 showing LDL reduction in ~700 participants consuming mixed nuts including walnuts), but none differentiate this cultivar or investigate its unique red pellicle. Current research focuses solely on nutritional profiles rather than clinical outcomes.

## Historical & Cultural Context

Red Walnut has no documented traditional medicinal uses, being a modern cultivar developed in 1991 specifically for its festive red-purple kernels suited for culinary occasions. While general Juglans regia walnuts have been consumed since ancient times for nutrition, this variety has no ties to formalized traditional medicine systems. The cultivar was bred for visual appeal rather than therapeutic purposes.

## Synergistic Combinations

Vitamin E, Fish Oil, Blueberry Extract, Selenium, Flaxseed Oil

## Frequently Asked Questions

### What makes Red Walnut different from regular walnuts?

Juglans regia 'Robert Livermore' is distinguished by a deep red pigmentation in its pellicle (the thin skin surrounding the kernel), caused by elevated concentrations of anthocyanins — specifically cyanidin-based glycosides absent or minimal in standard English walnut cultivars. This higher anthocyanin load theoretically provides greater antioxidant capacity per gram compared to conventional pale-pellicle walnuts, though direct comparative human studies have not been published.

### How much omega-3 does Red Walnut contain?

Red Walnut provides approximately 14% of its total fatty acid content as alpha-linolenic acid (ALA), an essential plant-derived omega-3. A standard 28g (1 oz) serving would deliver roughly 2.5–2.7g of ALA, which is comparable to conventional walnut cultivars and meets or exceeds the Adequate Intake of 1.1–1.6g/day for adults set by the Institute of Medicine.

### Are there any human studies on Red Walnut specifically?

As of current literature, no published human clinical trials have investigated the Juglans regia 'Robert Livermore' cultivar in isolation. Available evidence consists of general walnut research and in vitro antioxidant assays measuring anthocyanin activity; health outcomes observed in multi-cultivar walnut studies cannot be directly attributed to this variety due to its distinct phytochemical composition.

### Can Red Walnut interact with blood thinners like warfarin?

Red Walnut contains juglone and related naphthoquinones that may influence cytochrome P450 enzyme activity, potentially altering warfarin metabolism and affecting INR levels. Additionally, its ALA content at high intake levels may mildly inhibit platelet aggregation via altered thromboxane synthesis. Individuals on warfarin or other anticoagulants should discuss regular Red Walnut consumption with their prescribing physician and monitor INR accordingly.

### Is Red Walnut safe for people with tree nut allergies?

No — Red Walnut is a Juglans regia cultivar and is fully cross-reactive with standard walnut allergens, including the major proteins Jug r 1 (2S albumin), Jug r 2 (vicilin), and Jug r 3 (lipid transfer protein). Anyone with a confirmed walnut or tree nut allergy must avoid Red Walnut entirely, as the anthocyanin pigmentation does not alter its allergenic protein profile in any clinically meaningful way.

### How should Red Walnut be stored to preserve its anthocyanin content?

Red Walnut should be stored in a cool, dark, airtight container away from heat and light exposure, as anthocyanins are sensitive to oxidation and degradation. Refrigeration or freezing can help extend shelf life and maintain the red pigmentation and antioxidant compounds in the pellicle. Proper storage prevents rancidity of the omega-3 fatty acids and preserves the bioactive compounds that distinguish this cultivar from standard walnuts.

### What is the source of Red Walnut's red color, and does it affect its nutritional value?

Red Walnut's distinctive red coloring comes from elevated anthocyanin concentrations in the outer pellicle (seed coat), which are absent or minimal in traditional brown walnuts. These anthocyanins are potent antioxidants that may contribute additional antioxidant activity beyond the standard walnut profile, though human studies specifically confirming enhanced benefits in this cultivar are lacking. The red pellicle remains intact in whole nuts and can be retained in minimally processed walnut products to maximize anthocyanin content.

### Can Red Walnut's anthocyanins be absorbed effectively by the body?

Anthocyanins from plant sources generally have limited bioavailability and are partially degraded by gut bacteria, though some absorption occurs in the small intestine and colon. No bioavailability studies exist specifically for Red Walnut anthocyanins, so absorption rates cannot be confirmed for this cultivar. Consuming the whole nut with skin intact and pairing it with foods containing vitamin C may theoretically support anthocyanin retention, but clinical evidence for Red Walnut is unavailable.

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