# Brassica napus (Rutabaga)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/brassica-napus
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** rutabaga, swede, Swedish turnip, neep, yellow turnip, Brassica napus var. napobrassica, turnip cabbage, rotabaga

## Overview

Rutabaga (Brassica napus) is a cruciferous vegetable rich in glucosinolates, particularly gluconapin and glucobrassicanapin, which are hydrolyzed by myrosinase into bioactive isothiocyanates. These compounds modulate antioxidant enzymes and [inflammatory pathway](/ingredients/condition/inflammation)s, underpinning rutabaga's preliminary anti-inflammatory and [free radical scaveng](/ingredients/condition/antioxidant)ing properties.

## Health Benefits

["\u2022 Antioxidant Activity (Preliminary Evidence): In an in vitro study, a methanol extract of rutabaga seeds demonstrated 52.95% DPPH [free radical scaveng](/ingredients/condition/antioxidant)ing activity at a concentration of 50 \u00b5g/mL (PMID: 37687079).", "\u2022 [Anti-Inflammatory](/ingredients/condition/inflammation) Potential (Preliminary Evidence): In a lab setting, non-polar extracts from rutabaga seeds showed moderate anti-inflammatory effects, inhibiting the 15-lipoxygenase (15-LOX) enzyme by less than 30% (PMID: 37687079).", "\u2022 Cellular Safety Profile (Preliminary Evidence): In one in vitro study, rutabaga seed extracts showed no cytotoxicity against normal human kidney cells (HEK-293), suggesting a good safety profile at the cellular level (PMID: 37687079).", "\u2022 Limited Anti-Cancer Cell Activity (Preliminary Evidence): Research is limited to a single in vitro study where seed extracts exhibited limited anti-proliferative effects against Caco-2 colon cancer cells (PMID: 37687079).", "\u2022 Rich Source of Phenolic Compounds (Analytical Evidence): Rutabaga seeds, sprouts, and roots contain a range of polyphenols (5.1\u2013125.7 mg GAE/g), including gallic acid, p-coumaric acid, and trans-ferulic acid, which are known for their bioactive properties."]

## Mechanism of Action

Glucosinolates in rutabaga are enzymatically converted by myrosinase to isothiocyanates such as allyl isothiocyanate, which activate the Nrf2/Keap1 transcription pathway, upregulating cytoprotective enzymes including heme oxygenase-1 (HO-1) and NAD(P)H quinone oxidoreductase 1 (NQO1). These isothiocyanates also suppress NF-κB signaling, reducing downstream production of [pro-inflammatory cytokine](/ingredients/condition/inflammation)s such as TNF-α, IL-1β, and IL-6. Additionally, phenolic compounds including hydroxycinnamic acid derivatives present in rutabaga directly scavenge [reactive oxygen species](/ingredients/condition/antioxidant) (ROS), contributing to DPPH radical neutralization observed in vitro.

## Clinical Summary

Evidence for rutabaga's health effects remains at the preliminary, in vitro stage with no large-scale human clinical trials published to date. One in vitro study (PMID: 37687079) demonstrated that a methanol seed extract achieved 52.95% DPPH [free radical scaveng](/ingredients/condition/antioxidant)ing activity at 50 µg/mL, suggesting meaningful antioxidant capacity under laboratory conditions. [Anti-inflammatory](/ingredients/condition/inflammation) properties have been observed in cell-based assays, though translation to human physiology requires controlled clinical investigation. The overall evidence base is insufficient to establish therapeutic dosing recommendations, and rutabaga's benefits are best understood through its nutritional profile rather than supplemental use.

## Nutritional Profile

Rutabaga (Brassica napus) per 100g raw: Calories ~37 kcal, Carbohydrates ~8.6g (of which sugars ~6.0g), Dietary Fiber ~2.3g (mix of soluble pectin and insoluble cellulose/hemicellulose), Protein ~1.1g (relatively low, incomplete amino acid profile), Fat ~0.2g. Key Vitamins: Vitamin C ~25mg (~28% DV; moderate bioavailability, heat-sensitive, significantly reduced by boiling), Vitamin K1 ~0.3µg, Folate (B9) ~21µg (~5% DV), Vitamin B6 ~0.1mg, Thiamine (B1) ~0.09mg, small amounts of Vitamin E (~0.3mg). Key Minerals: Potassium ~305mg (~9% DV; good bioavailability), Calcium ~47mg (~5% DV; bioavailability partially limited by oxalates), Magnesium ~20mg, Phosphorus ~53mg, Manganese ~0.13mg, small amounts of Iron (~0.44mg, non-heme, lower bioavailability). Bioactive Compounds: Glucosinolates (notably gluconapin and progoitrin, ~1–3 µmol/g fresh weight; converted to isothiocyanates and nitriles upon hydrolysis by myrosinase enzyme, relevant to [antioxidant](/ingredients/condition/antioxidant) and potential anticancer activity; cooking inactivates myrosinase reducing conversion efficiency), Carotenoids (~beta-carotene ~10µg, lutein/zeaxanthin trace amounts), Polyphenols including hydroxycinnamic acids (sinapic acid derivatives) and flavonoids (quercetin glycosides) at modest concentrations. Anthocyanins present in purple-skinned varieties. Indole-3-carbinol may be generated from glucosinolate breakdown. Fiber bioavailability note: pectin fraction contributes to viscosity in the gut, supporting cholesterol modulation. Glucosinolate bioavailability is higher in raw consumption; boiling leaches water-soluble glucosinolates and Vitamin C by 20–40%.

## Dosage & Preparation

No clinically studied dosage for rutabaga supplements has been established, as no human trials have been conducted. In vitro research has used seed extracts at concentrations of 50 µg/mL, but this does not translate to a human dose. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Rutabaga consumed as a whole food is generally recognized as safe for most adults, but high intake may cause gastrointestinal bloating, gas, and flatulence due to its raffinose-type oligosaccharides and fiber content. Individuals taking anticoagulant medications such as warfarin should exercise caution, as rutabaga's vitamin K content may interfere with INR stability. Due to its goitrogenic glucosinolate content, individuals with hypo[thyroid](/ingredients/condition/hormonal)ism or iodine deficiency should avoid excessive consumption, as glucosinolates can inhibit thyroid iodine uptake when eaten raw in large quantities. Pregnant and breastfeeding women may consume rutabaga as a food safely, but concentrated rutabaga seed extracts or supplements lack adequate safety data for these populations.

## Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses on rutabaga as a biomedical supplement were found in the available research. Current scientific understanding is based solely on preliminary in vitro (test-tube) studies, such as one investigating the [antioxidant](/ingredients/condition/antioxidant) and anti-proliferative potential of seed extracts (PMID: 37687079).

## Historical & Cultural Context

Since the 17th century, rutabaga has been a staple food in Europe and North America, commonly mashed (rotmos) or used as livestock forage. It also has a cultural history in the British Isles, where it was traditionally carved into Jack-o'-lanterns for Halloween. No documented use in traditional medicine systems was found in the research.

## Synergistic Combinations

Iodine, Gallic Acid, Turnip, Cabbage

## Frequently Asked Questions

### What are the active compounds in rutabaga responsible for its health benefits?

Rutabaga's primary bioactive compounds are glucosinolates — specifically gluconapin and glucobrassicanapin — which are converted by the enzyme myrosinase into isothiocyanates upon chewing or processing. These isothiocyanates activate Nrf2-mediated antioxidant pathways and suppress NF-κB-driven inflammation. Phenolic acids such as sinapic acid also contribute to its measured antioxidant activity.

### Is rutabaga good for inflammation?

Preliminary laboratory evidence suggests rutabaga extracts can reduce inflammatory markers by suppressing NF-κB signaling and lowering TNF-α and IL-6 production in cell-based models. However, no human clinical trials have confirmed these anti-inflammatory effects at typical dietary intake levels. Rutabaga's isothiocyanate content is the most plausible driver of this activity, analogous to better-studied cruciferous vegetables like broccoli.

### How does rutabaga compare to other cruciferous vegetables for antioxidant activity?

A methanol extract of rutabaga seeds showed 52.95% DPPH scavenging activity at 50 µg/mL (PMID: 37687079), which is a moderate antioxidant capacity but generally lower than concentrated extracts from broccoli sprouts or kale, which can exceed 80% inhibition under similar assay conditions. Rutabaga contains lower sulforaphane precursors compared to broccoli, making it a mild rather than potent antioxidant source among crucifers. Its contribution is meaningful as part of a varied diet rather than as a primary antioxidant supplement.

### Can people with thyroid conditions eat rutabaga?

Rutabaga contains goitrogenic glucosinolates that can inhibit thyroid peroxidase and reduce iodine uptake by the thyroid gland, particularly when consumed raw and in large amounts. Cooking denatures myrosinase enzyme activity, significantly reducing the goitrogenic potential of these compounds. Individuals with hypothyroidism or iodine deficiency should limit raw rutabaga intake and consult a healthcare provider, though moderate consumption of cooked rutabaga is generally considered low-risk.

### What is the difference between rutabaga and turnip nutritionally?

Rutabaga (Brassica napus) and turnip (Brassica rapa) are related crucifers, but rutabaga is generally denser in calories, carbohydrates, and vitamin C, providing approximately 35 kcal and 8g of carbohydrates per 100g compared to turnip's 28 kcal and 6g. Rutabaga has a higher glucosinolate content by weight, particularly gluconapin, which may confer stronger isothiocyanate-mediated effects. Both vegetables contain similar fiber levels, but rutabaga provides modestly more potassium and beta-carotene than turnip.

### What is the research quality and strength of evidence for rutabaga's health benefits?

Current research on rutabaga is primarily preliminary, consisting mainly of in vitro (lab-based) studies using seed extracts rather than whole food or human clinical trials. While these studies show promising antioxidant activity (52.95% DPPH scavenging) and anti-inflammatory potential, they cannot be directly translated to human supplementation or dietary intake. More rigorous human studies are needed to establish the clinical significance of rutabaga's bioactive compounds for disease prevention or treatment.

### Is rutabaga safe for children and elderly populations?

Rutabaga is generally safe for both children and elderly individuals as a whole food, containing no known toxins in normal dietary amounts and providing valuable nutrients like vitamin C, potassium, and fiber. However, elderly individuals taking anticoagulant medications (like warfarin) should maintain consistent rutabaga intake due to its vitamin K content to avoid dietary interference. As with any cruciferous vegetable, individuals with thyroid conditions should consume rutabaga in moderation and monitor their thyroid function with their healthcare provider.

### Are there differences in nutrient content between rutabaga seeds, roots, and leaves?

Most research on rutabaga's antioxidant and anti-inflammatory activity focuses on the seeds, which appear to have concentrated bioactive compounds compared to the root vegetable commonly consumed as food. The edible root portion provides substantial amounts of vitamin C, fiber, and carbohydrates but may contain lower concentrations of polyphenolic antioxidants than the seeds. Rutabaga leaves are also nutrient-dense and contain higher levels of certain minerals and vitamins, though they are less commonly consumed than the root.

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