# Crotalaria juncea

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/crotalaria-juncea
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 2 / 10
**Category:** Ayurveda
**Also Known As:** Crotalaria juncea L., Sunn hemp, Indian hemp, Brown hemp, Madras hemp, Bombay hemp, Sann hemp

## Overview

Crotalaria juncea is an Ayurvedic plant containing bioactive compounds that demonstrate [antimicrobial](/ingredients/condition/immune-support) activity against Gram-positive bacteria with MIC values of 16-200 μg/mL. The extract shows [anti-inflammatory](/ingredients/condition/inflammation) potential through 76.31% lipoxygenase enzyme inhibition comparable to indomethacin.

## Health Benefits

• [Antimicrobial](/ingredients/condition/immune-support) activity against Gram-positive bacteria (MIC 16-200 μg/mL) and fungi including Microsporum gypseum (MIC 200 μg/mL) - preliminary in vitro evidence only
• [Anti-inflammatory](/ingredients/condition/inflammation) potential through lipoxygenase (LOX) inhibition (76.31% inhibition comparable to indomethacin) - preliminary in vitro evidence only
• Non-cytotoxic to healthy cells at concentrations up to 100-300 μg/mL in fibroblast and macrophage cell lines - preliminary safety data only
• Potential liver and kidney protective effects in animal models - limited preclinical evidence only
• [Antioxidant activity](/ingredients/condition/antioxidant) attributed to flavonoids and phenolic compounds - preliminary in vitro evidence only

## Mechanism of Action

Crotalaria juncea exerts [anti-inflammatory](/ingredients/condition/inflammation) effects by inhibiting lipoxygenase (LOX) enzymes, which are responsible for producing inflammatory mediators like leukotrienes. The [antimicrobial](/ingredients/condition/immune-support) activity appears to target bacterial cell wall synthesis or membrane integrity in Gram-positive bacteria. The bioactive compounds also demonstrate antifungal properties against dermatophyte species like Microsporum gypseum.

## Clinical Summary

Current evidence for Crotalaria juncea is limited to preliminary in vitro studies only. Laboratory research shows [antimicrobial](/ingredients/condition/immune-support) activity with minimum inhibitory concentrations ranging from 16-200 μg/mL against various Gram-positive bacteria and 200 μg/mL against Microsporum gypseum fungi. [Anti-inflammatory](/ingredients/condition/inflammation) testing demonstrates 76.31% lipoxygenase inhibition comparable to the pharmaceutical drug indomethacin. No human clinical trials or animal studies have been conducted to validate these preliminary findings.

## Nutritional Profile

Crotalaria juncea (sunn hemp) seeds and leaves contain notable bioactive compounds and nutrients. **Proteins:** Seeds contain approximately 30-35% crude protein, making it a significant plant protein source, though anti-nutritional factors (pyrrolizidine alkaloids) limit direct consumption. **Fiber:** High dietary fiber content (~30-40% in seed hulls), primarily cellulose and hemicellulose. **Minerals:** Contains calcium (~0.3-0.5% dry weight), phosphorus (~0.2-0.4%), potassium (~1.0-1.5%), iron (~50-150 mg/kg), magnesium, and zinc in moderate amounts. **Bioactive compounds:** Rich in flavonoids including vitexin, isovitexin, and orientin (concentrations ~0.5-2.0 mg/g dry weight); phenolic acids including gallic acid, caffeic acid, and chlorogenic acid (total phenolics ~15-45 mg GAE/g extract). **Pyrrolizidine alkaloids (PAs):** Contains monocrotaline (primary PA, ~0.5-3.0% in seeds), retronecine-type alkaloids including junceine and crotananine — these are hepatotoxic and limit internal medicinal use; seeds are considered toxic for ingestion in significant quantities. **Fatty acids:** Seed oil (~5-8% content) contains linoleic acid (~45-55%), oleic acid (~20-30%), and palmitic acid (~10-15%). **Vitamins:** Leaves contain moderate vitamin C (~20-40 mg/100g fresh weight), beta-carotene (~2-5 mg/100g fresh leaves), and B-complex vitamins in trace amounts. **Saponins and tannins:** Present in moderate quantities (~2-5% dry weight), contributing to [antimicrobial](/ingredients/condition/immune-support) properties. **Bioavailability notes:** Pyrrolizidine alkaloids are readily bioavailable and hepatotoxic upon metabolic activation via cytochrome P450 enzymes; flavonoid glycosides (vitexin, orientin) have relatively low oral bioavailability (~5-10%) due to poor intestinal absorption. Phenolic compounds show moderate bioavailability enhanced by traditional aqueous/alcoholic extraction methods used in Ayurvedic preparations. External (topical) applications bypass PA hepatotoxicity concerns, improving therapeutic safety index for antimicrobial and [anti-inflammatory](/ingredients/condition/inflammation) uses.

## Dosage & Preparation

No clinically studied dosage ranges exist as human trials are absent. In vitro studies used ethanolic extracts at 1-500 μg/mL for [antimicrobial](/ingredients/condition/immune-support) testing, with non-toxic effects observed up to 100-300 μg/mL in cell culture. No standardization or human dosing guidelines have been established. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Safety data for Crotalaria juncea is extremely limited with no established human safety profile or dosage guidelines. Many Crotalaria species contain pyrrolizidine alkaloids which can cause severe hepatotoxicity and should be avoided during pregnancy and breastfeeding. Potential interactions with [anti-inflammatory](/ingredients/condition/inflammation) medications like NSAIDs are unknown but theoretically possible given the LOX inhibition activity. Consultation with healthcare providers is essential before use, especially for individuals with liver conditions or those taking medications.

## Scientific Research

No human clinical trials, randomized controlled trials (RCTs), or meta-analyses have been conducted with Crotalaria juncea. Research is limited to in vitro [antimicrobial](/ingredients/condition/immune-support) assays and cytotoxicity tests (PMID: 38213478 for flower extract antimicrobials), with all existing studies being preclinical laboratory investigations only.

## Historical & Cultural Context

Crotalaria juncea has been documented primarily as an agricultural crop used for soil improvement and green manure rather than as a traditional medicine. No specific historical use in traditional medicine systems like Ayurveda or TCM was identified in the available research.

## Synergistic Combinations

Turmeric, Boswellia serrata, Ginger, Green tea extract, Quercetin

## Frequently Asked Questions

### What is the effective dosage of Crotalaria juncea?

No established human dosage exists for Crotalaria juncea as only in vitro studies have been conducted. Laboratory studies used extract concentrations of 16-200 μg/mL, but this cannot be translated to human dosing without clinical trials.

### Can Crotalaria juncea treat bacterial infections?

Preliminary lab studies show antimicrobial activity against Gram-positive bacteria with MIC values of 16-200 μg/mL. However, no human studies exist to confirm effectiveness for treating actual infections, and it should not replace proven antibiotics.

### Is Crotalaria juncea safe during pregnancy?

Crotalaria juncea safety during pregnancy is unknown, but many Crotalaria species contain hepatotoxic pyrrolizidine alkaloids. Pregnant and breastfeeding women should avoid this herb due to potential liver toxicity and lack of safety data.

### How does Crotalaria juncea compare to indomethacin for inflammation?

In laboratory studies, Crotalaria juncea extract showed 76.31% lipoxygenase inhibition comparable to indomethacin. However, this in vitro activity does not guarantee similar anti-inflammatory effects in humans, and clinical trials are needed for comparison.

### What are the side effects of Crotalaria juncea?

Specific side effects of Crotalaria juncea are unknown due to lack of human studies. Potential concerns include liver toxicity from possible pyrrolizidine alkaloids, similar to other Crotalaria species, and unknown interactions with medications.

### What does current research show about Crotalaria juncea's effectiveness?

Current evidence for Crotalaria juncea is limited to preliminary in vitro (laboratory) studies, which show promise against certain bacteria and fungi, as well as anti-inflammatory potential through lipoxygenase inhibition. No human clinical trials have been conducted to date, so claims about its therapeutic effectiveness remain unproven in real-world use. The in vitro findings cannot be directly translated to oral supplementation or systemic effects in the body. More rigorous research, including animal studies and human trials, would be needed to establish safe and effective dosing for any health application.

### Who should avoid Crotalaria juncea supplements?

Individuals with known hypersensitivity or allergy to plants in the Fabaceae (legume) family should avoid Crotalaria juncea. Pregnant and breastfeeding women should not use this ingredient due to insufficient safety data. Those taking medications metabolized by the liver or individuals with liver disease should consult a healthcare provider before use, as the herb's interaction profile has not been thoroughly studied. Additionally, children and the elderly should only use this ingredient under professional supervision.

### How does the bioavailability of Crotalaria juncea change based on preparation method?

The bioavailability of Crotalaria juncea across different preparation methods (dried herb, extract, decoction, tincture) has not been systematically studied in published research. Traditional preparations typically involve decoction or infusion, but no comparative bioavailability data exists to determine which form delivers active compounds most effectively to the body. Factors such as extraction solvent, plant part used, and processing method likely affect the concentration of antimicrobially and anti-inflammatory active compounds, but specific guidance cannot be provided without controlled studies. Until bioavailability research is conducted, optimal preparation methods remain speculative.

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