# Rutabaga Leaf (Brassica napus var. napobrassica)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/rutabaga-leaf
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Brassica napus var. napobrassica, Swede leaves, Swedish turnip leaves, Neep greens, Turnip-rooted cabbage leaves, Rutabaga greens, Yellow turnip leaves

## Overview

Rutabaga leaves contain polyphenols and flavonoids that demonstrate [antioxidant activity](/ingredients/condition/antioxidant) and potential [anti-inflammatory](/ingredients/condition/inflammation) effects through 15-LOX enzyme inhibition. These compounds may also support cellular health by promoting apoptosis in abnormal cells.

## Health Benefits

• [Antioxidant activity](/ingredients/condition/antioxidant) demonstrated in vitro through polyphenols and flavonoids (preliminary evidence from seed/sprout extracts)
• [Anti-inflammatory](/ingredients/condition/inflammation) effects via 15-LOX enzyme inhibition (in vitro evidence from related plant parts)
• Potential cancer cell proliferation inhibition through apoptosis induction in Hep G2 cells (in vitro evidence only)
• May modulate estrogen [metabolism](/ingredients/condition/weight-management) like other cruciferous vegetables (indirect evidence from general cruciferous studies)
• Contains glucosinolates and sulfur compounds characteristic of Brassica species (compositional data only, no leaf-specific clinical evidence)

## Mechanism of Action

Rutabaga leaf polyphenols and flavonoids neutralize [free radical](/ingredients/condition/antioxidant)s through electron donation and metal chelation pathways. The compounds inhibit 15-lipoxygenase enzyme activity, reducing pro-[inflammatory](/ingredients/condition/inflammation) leukotriene synthesis. These bioactives may also modulate cellular apoptosis pathways by influencing [mitochondrial](/ingredients/condition/energy) membrane potential and caspase activation.

## Clinical Summary

Current evidence for rutabaga leaf benefits comes primarily from in vitro laboratory studies examining [antioxidant](/ingredients/condition/antioxidant) capacity and enzyme inhibition. Research has focused on related Brassica napus seed and sprout extracts rather than mature leaf preparations. No human clinical trials have specifically evaluated rutabaga leaf consumption for health outcomes. The existing preliminary evidence suggests potential benefits but requires human studies to establish clinical relevance and effective dosing.

## Nutritional Profile

Rutabaga leaf (Brassica napus var. napobrassica) nutritional data is limited compared to the root, but extrapolation from closely related Brassica napus leaves and general cruciferous leaf composition provides the following estimates: Macronutrients (per 100g fresh weight): Water ~88-92g, Protein ~2.5-3.5g (including glucosinolate-binding proteins and RuBisCO), Total Carbohydrates ~4-6g, Dietary Fiber ~2-3g (cellulose, hemicellulose, pectin), Fat ~0.3-0.5g. Micronutrients: Vitamin C ~60-120mg (high, typical of cruciferous leaves; bioavailability moderate, reduced by cooking ~50-70%), Vitamin K1 (phylloquinone) ~150-300µg (highly bioavailable with dietary fat), Folate (B9) ~60-100µg DFE, Vitamin A (as beta-carotene) ~200-500µg RAE (bioavailability ~10-15% from plant matrix), Calcium ~100-150mg (bioavailability reduced by oxalates to ~5-10%), Potassium ~300-400mg, Magnesium ~20-30mg, Iron ~1.5-2.5mg (non-heme; bioavailability ~5-12%, enhanced by co-consumed vitamin C), Manganese ~0.3-0.5mg. Bioactive Compounds: Glucosinolates ~15-40µmol/g dry weight, predominantly gluconapin (2-propenyl glucosinolate) and glucobrassicanapin, hydrolyzed by myrosinase to isothiocyanates (e.g., allyl isothiocyanate) and indoles (indole-3-carbinol); bioavailability of isothiocyanates is significantly higher from raw (~40%) vs. cooked leaves (~10%). Total Polyphenols ~50-150mg GAE/100g fresh weight, including flavonoids (kaempferol glycosides, quercetin glycosides ~10-30mg/100g), hydroxycinnamic acids (sinapic acid, caffeic acid derivatives ~20-60mg/100g); bioavailability varies 10-30% depending on [gut microbiome](/ingredients/condition/gut-health) and food matrix. Chlorophyll ~50-100mg/100g. Lutein and zeaxanthin ~1-3mg/100g (lipid-dependent bioavailability). Note: Leaf composition varies significantly with plant age, growing conditions, and cultivar; young tender leaves likely contain higher glucosinolate and vitamin C concentrations than mature leaves. Direct analytical studies specifically on rutabaga leaves are sparse; values are inferred from B. napus leaf and related turnip greens (B. rapa) literature.

## Dosage & Preparation

No clinically studied dosage ranges exist for rutabaga leaf in any form. In vitro studies used methanol extracts at 50 µg/mL for enzyme inhibition assays, but these cannot be translated to human dosing. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Rutabaga leaves are generally considered safe when consumed as food, but concentrated extracts lack safety data. As a cruciferous vegetable, rutabaga leaves contain goitrogens that may interfere with [thyroid function](/ingredients/condition/hormonal) in susceptible individuals. The leaves may interact with anticoagulant medications due to vitamin K content. Pregnant and breastfeeding women should avoid supplemental forms due to insufficient safety research.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specifically on rutabaga leaf have been conducted. Available research focuses on in vitro studies of rutabaga seed and sprout extracts showing [antioxidant](/ingredients/condition/antioxidant) and [anti-inflammatory](/ingredients/condition/inflammation) properties, while human studies exist only for general cruciferous vegetable consumption affecting estrogen [metabolism](/ingredients/condition/weight-management) in postmenopausal women.

## Historical & Cultural Context

Rutabaga has been consumed as a nutrient-dense root vegetable in northern European diets since the Middle Ages, particularly in Scandinavia and Scotland, valued for nutrition rather than medicinal applications. No sources detail traditional medicine use specifically for rutabaga leaves.

## Synergistic Combinations

Kale, Collard Greens, Broccoli Sprouts, Mustard Greens, Watercress

## Frequently Asked Questions

### What compounds in rutabaga leaves provide health benefits?

Rutabaga leaves contain polyphenols and flavonoids that provide antioxidant activity. These same compounds found in related Brassica napus extracts have demonstrated 15-LOX enzyme inhibition in laboratory studies.

### Can rutabaga leaves help with inflammation?

In vitro studies suggest rutabaga leaf compounds may reduce inflammation by inhibiting 15-lipoxygenase enzyme activity. However, human studies are needed to confirm anti-inflammatory effects from consuming rutabaga leaves.

### Are rutabaga leaves safe to eat daily?

Rutabaga leaves are safe as occasional food but contain goitrogens that may affect thyroid function with excessive consumption. People taking blood thinners should monitor vitamin K intake from rutabaga leaves.

### How much rutabaga leaf should I consume for health benefits?

No established dosage exists for rutabaga leaves as most research used seed or sprout extracts. Consuming them occasionally as part of a varied diet appears safe for most people.

### Do rutabaga leaves have cancer-fighting properties?

Laboratory studies suggest rutabaga-related compounds may promote apoptosis in abnormal cells. However, no human studies have examined rutabaga leaf consumption for cancer prevention or treatment effects.

### Is rutabaga leaf safe during pregnancy and breastfeeding?

Rutabaga leaf is a food-form cruciferous vegetable generally recognized as safe in normal dietary amounts during pregnancy and breastfeeding. However, very high supplemental intakes of goitrogens (compounds that may affect thyroid function) are not recommended without medical supervision during these periods. Pregnant or nursing women should consume rutabaga leaf as part of a balanced diet and consult their healthcare provider before using concentrated extracts or supplements.

### Does rutabaga leaf interact with thyroid medications or hormone therapies?

Rutabaga leaf contains goitrogens that may theoretically interfere with thyroid function or interact with thyroid replacement medications (like levothyroxine) and hormone therapies when consumed in very large supplemental amounts. Cooking inactivates most goitrogens, making cooked rutabaga leaf safer for those with thyroid conditions. Individuals taking thyroid medications or hormone therapies should consume rutabaga leaf in moderation and consult their healthcare provider about appropriate intake levels.

### What is the difference between rutabaga leaf and other cruciferous greens like kale or broccoli?

Rutabaga leaf shares similar glucosinolates and polyphenol compounds with kale and broccoli but in different proportions and concentrations specific to the napobrassica variety. While all three are nutrient-dense cruciferous vegetables, kale and broccoli have stronger established clinical evidence for anti-inflammatory and antioxidant benefits, whereas rutabaga leaf research remains primarily in vitro. Rutabaga leaf tends to be milder in flavor and texture compared to kale and may be more palatable for regular consumption in salads or cooked preparations.

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