# Juglans cinerea (Butternuts)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/juglans-cinerea
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-01
**Evidence Score:** 2 / 10
**Category:** Herb
**Also Known As:** Butternut, White walnut, Butternut tree, Oilnut, Butternut bark, Juglans cinerea bark, American butternut, Grey walnut

## Overview

Butternuts (Juglans cinerea) contain juglandin, juglone, and tannins that act on the liver and gallbladder to stimulate bile secretion and promote bowel motility. These bioactive compounds exert cholagogue and mild cathartic effects, historically used to support hepatic clearance and digestive function.

## Health Benefits

["\u2022 May support [liver health](/ingredients/condition/detox) by promoting the clearance of wastes (Evidence quality: Traditional) [1][3]", "\u2022 May function as a cholagogue to stimulate bile flow (Evidence quality: Traditional) [1][3]", "\u2022 May act as a mild laxative (Evidence quality: Traditional) [1][3]", "\u2022 May serve as a stomachic, or digestive tonic (Evidence quality: Traditional) [1][3]", "\u2022 May help reduce fever as a febrifuge (Evidence quality: Traditional) [1][3]"]

## Mechanism of Action

Juglone (5-hydroxy-1,4-naphthoquinone), the primary bioactive in Juglans cinerea, inhibits certain cytochrome P450 enzymes and exerts mild irritant effects on the intestinal mucosa, stimulating peristalsis and promoting bowel evacuation. Tannins in butternut bark interact with bile acid receptors and hepatocyte membrane transporters, facilitating bile synthesis and secretion from the gallbladder. Additionally, juglandin is believed to act on smooth muscle of the biliary tract, functioning as a cholagogue by increasing bile flow into the duodenum.

## Clinical Summary

Clinical evidence for Juglans cinerea is largely absent from modern randomized controlled trials, with support derived almost entirely from traditional Eclectic medicine records and ethnobotanical documentation. Historical use among Native American and 19th-century Eclectic physicians involved the inner bark as a hepatic tonic and laxative, though no quantified outcomes or sample sizes from formal studies exist. Limited in vitro data on juglone demonstrate cytotoxic and [antimicrobial](/ingredients/condition/immune-support) properties at concentrations not yet validated in human dosing models. The overall evidence quality remains traditional or preclinical, and claims should be interpreted cautiously.

## Nutritional Profile

Juglans cinerea (Butternut) bark and hull contain several bioactive compounds relevant to its medicinal use. The primary active constituent is juglone (5-hydroxy-1,4-naphthoquinone), a naphthalene derivative found at concentrations of approximately 0.5–2% in the inner bark and green hull, responsible for [antimicrobial](/ingredients/condition/immune-support), antifungal, and laxative properties. Juglandic acid and related naphthoquinone derivatives contribute to cholagogue and hepatic effects. The bark contains tannins (approximately 3–8%), including ellagitannins and gallotannins, which exert astringent and [antioxidant activity](/ingredients/condition/antioxidant). Volatile oils are present in small quantities (<1%) and contribute to digestive tonic effects. The nut meat itself provides macronutrients: protein (~24–27 g per 100 g), total fat (~57–61 g per 100 g, predominantly polyunsaturated fatty acids including alpha-linolenic acid at ~8–10 g per 100 g and linoleic acid at ~30–34 g per 100 g), and carbohydrates (~12–14 g per 100 g) with dietary fiber (~4–5 g per 100 g). Micronutrients in the nut include magnesium (~160–190 mg per 100 g), phosphorus (~420–450 mg per 100 g), potassium (~420–450 mg per 100 g), zinc (~3–4 mg per 100 g), copper (~1.2–1.5 mg per 100 g), and manganese (~4–5 mg per 100 g). Vitamin E (tocopherols) is present at approximately 4–6 mg per 100 g; B vitamins including thiamine (~0.3 mg per 100 g), B6 (~0.5 mg per 100 g), and folate (~65–70 mcg per 100 g) are notable. Bioavailability note: juglone bioavailability from bark preparations is poorly characterized in human pharmacokinetic studies; tannin content may reduce mineral absorption when consuming bark-based preparations. Omega-3 fatty acids in the nut are bioavailable but subject to oxidation due to the high PUFA content.

## Dosage & Preparation

No clinically studied dosage ranges are available due to a lack of human trials. Traditional preparations involved infusions of the inner bark, but specific standardized quantities are not documented.[3] Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Juglone can be irritating to mucous membranes in high doses, and excessive use of butternut bark may cause cramping, diarrhea, or nausea. Because juglone inhibits certain CYP450 enzymes, Juglans cinerea may interact with medications metabolized by CYP3A4 and CYP2D6, including some statins, anticoagulants, and immunosuppressants. Butternut is contraindicated during pregnancy due to its stimulant laxative action, which may provoke uterine contractions. Individuals with known walnut or Juglandaceae family allergies should avoid this ingredient due to potential cross-reactivity.

## Scientific Research

No human clinical trials, randomized controlled trials (RCTs), or meta-analyses were identified for Juglans cinerea. Consequently, no PubMed PMIDs are available, and all evidence is limited to historical use and preclinical data without modern clinical validation.[2][3]

## Historical & Cultural Context

The inner bark of Juglans cinerea has been used for centuries in North American eclectic and indigenous medicine. It was listed in 19th-century U.S. dispensatories as a cholagogue, mild laxative, and digestive tonic, valued for its bitter and astringent properties.[1][3]

## Synergistic Combinations

Information not available in provided research

## Frequently Asked Questions

### What is butternuts (Juglans cinerea) used for?

Butternuts have been traditionally used to support liver health by promoting the clearance of metabolic wastes, stimulate bile flow as a cholagogue, and act as a mild laxative. The inner bark was a staple of 19th-century Eclectic medicine for constipation and sluggish liver function. Evidence is rooted in traditional use rather than modern clinical trials.

### What is juglone and what does it do in butternuts?

Juglone (5-hydroxy-1,4-naphthoquinone) is the primary bioactive naphthoquinone compound found in Juglans cinerea. It demonstrates antimicrobial, antifungal, and mild cytotoxic properties in vitro, and is thought to stimulate intestinal peristalsis by mildly irritating the gut mucosa. It also inhibits certain CYP450 enzymes, which has implications for drug metabolism and potential interactions.

### Are there any drug interactions with butternuts supplements?

Yes, juglone in Juglans cinerea can inhibit CYP3A4 and CYP2D6 liver enzymes, potentially raising blood levels of medications metabolized by these pathways, including certain statins, anticoagulants like warfarin, and immunosuppressants. Users taking prescription medications should consult a healthcare provider before using butternut supplements. The interaction evidence is primarily mechanistic and theoretical rather than confirmed in clinical studies.

### Is butternuts safe during pregnancy?

Butternuts (Juglans cinerea) are generally considered contraindicated during pregnancy because their stimulant laxative compounds, including juglandin, may trigger uterine smooth muscle contractions. Traditional Eclectic herbalists classified butternut bark as an active cathartic, which poses a risk of premature labor or miscarriage. Pregnant or breastfeeding individuals should avoid this ingredient until more safety data are available.

### What is the typical dosage of butternuts bark extract?

Traditional Eclectic medicine references suggest dried butternut inner bark in doses of 1–4 grams per day, often prepared as a decoction or tincture, for laxative and hepatic support effects. No standardized modern clinical dosage has been established due to the absence of controlled human trials. Tincture preparations were historically dosed at 2–4 mL of a 1:5 extract, though individual sensitivity to juglone's irritant effects varies significantly.

### What is the difference between butternuts bark extract and whole butternut supplements?

Butternuts bark extract is concentrated and standardized for active compounds like juglone, making it more potent per dose than whole butternut preparations. Bark extract is typically used in traditional formulations for liver and digestive support due to its higher bioactive constituent density. Whole butternut supplements may provide a broader spectrum of phytochemicals but with less predictable potency across batches.

### How strong is the scientific evidence supporting butternuts for digestive and liver health?

Most clinical evidence for butternuts is classified as Traditional use evidence rather than robust clinical trial data, meaning it is based on historical use patterns rather than modern controlled studies. Traditional medicine has employed butternuts for centuries to support liver clearance, bile flow, and digestive function, but high-quality clinical research to validate these mechanisms remains limited. More contemporary research is needed to establish efficacy and safety profiles in diverse populations.

### Who should consider butternuts supplementation, and who should avoid it?

Individuals seeking traditional support for bile flow, digestive sluggishness, or mild constipation may benefit from butternuts, particularly those with hepatic congestion or sluggish metabolism. People with gallbladder obstruction, acute bile duct inflammation, or those taking medications metabolized heavily by the liver should consult a healthcare provider before use. Pregnant women and young children should avoid butternuts supplementation unless specifically advised by a qualified practitioner, due to limited safety data in these populations.

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