# Brassica napus var. napobrassica (Rutabaga)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/brassica-napus-var-napobrassica
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Swede, Swedish turnip, Neep, Turnip cabbage, Yellow turnip, Brassica napus var. napobrassica, Rutabaga root, Winter turnip, Canadian turnip

## Overview

Rutabaga (Brassica napus var. napobrassica) is a cruciferous vegetable whose sprouts are exceptionally rich in glucosinolates and polyphenols, which drive its antioxidant and potential anti-cancer activity. These bioactive compounds undergo enzymatic hydrolysis via myrosinase to produce isothiocyanates, which modulate detoxification enzymes and [oxidative stress](/ingredients/condition/antioxidant) pathways.

## Health Benefits

• [Antioxidant activity](/ingredients/condition/antioxidant): In vitro studies show rutabaga sprouts contain high polyphenol concentrations (up to 125.7 mg gallic acid equivalents per gram) with demonstrated antioxidant properties (Evidence: Preliminary - cell culture only)
• Selective anti-cancer properties: Laboratory studies found rutabaga sprout extracts induced apoptosis in human hepatoma cells while sparing normal mammalian cells (Evidence: Preliminary - PMID 23957358)
• Antiproliferative effects: 8-day-old rutabaga sprouts showed tumor cell growth inhibition in CHO-K1 and Hep G2 cell lines (Evidence: Preliminary - in vitro only)
• Vitamin C source: Contains 25 mg vitamin C per 100g serving, providing 30% of daily recommended intake (Evidence: Nutritional data)
• Potential thyroid effects: Contains cyanoglucosides that release thiocyanate, which may affect [thyroid function](/ingredients/condition/hormonal) at very high doses (Evidence: Theoretical concern - no human adverse effects reported)

## Mechanism of Action

Glucosinolates in rutabaga are hydrolyzed by the enzyme myrosinase upon cell disruption, yielding isothiocyanates such as allyl isothiocyanate, which activate the Nrf2/ARE pathway to upregulate [phase II detox](/ingredients/condition/detox)ification enzymes including glutathione S-transferase and quinone reductase. Polyphenolic compounds in rutabaga sprouts scavenge [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) and chelate pro-oxidant metal ions, reducing lipid peroxidation and oxidative DNA damage in cell-based assays. Additionally, isothiocyanates have been shown in vitro to inhibit histone deacetylase (HDAC) activity and modulate apoptotic signaling, selectively inducing cell death in transformed cells while sparing normal cells.

## Clinical Summary

Evidence for rutabaga's health benefits is currently limited to in vitro and preclinical studies, with no completed human clinical trials specifically on rutabaga supplementation identified in the literature. Cell culture studies have quantified polyphenol concentrations in rutabaga sprouts at up to 125.7 mg gallic acid equivalents per gram dry weight, with demonstrated [free radical scaveng](/ingredients/condition/antioxidant)ing capacity. Laboratory models suggest selective cytotoxicity against cancer cell lines, but these effects have not been validated in animal models or human trials, making any therapeutic claims premature. Epidemiological data on cruciferous vegetable consumption broadly suggest inverse associations with certain cancers, but rutabaga-specific human data are lacking.

## Nutritional Profile

Rutabaga (raw, per 100g edible portion): Macronutrients - Carbohydrates 8.6g (of which sugars 4.5g), Dietary fiber 2.3g, Protein 1.1g, Fat 0.2g, Water 89.7g, Energy 37 kcal. Key Vitamins - Vitamin C 25mg (28% DV; moderate bioavailability, heat-sensitive and significantly reduced by boiling), Folate (B9) 21mcg (5% DV), Vitamin B6 0.1mg (6% DV), Thiamine (B1) 0.09mg (8% DV), Vitamin K 0.3mcg (trace), Vitamin E 0.3mg (2% DV). Key Minerals - Potassium 305mg (9% DV; good bioavailability), Calcium 47mg (5% DV; moderate bioavailability, partially inhibited by oxalates), Magnesium 20mg (5% DV), Phosphorus 53mg (8% DV), Manganese 0.13mg (6% DV), Iron 0.44mg (2% DV; non-heme, low bioavailability ~5-12%), Zinc 0.24mg (2% DV), Sodium 20mg. Bioactive Compounds - Glucosinolates: primarily gluconapin and progoitrin (collectively 15-30 micromoles per gram dry weight in root tissue; significantly higher in sprouts), hydrolyzed by myrosinase enzyme to isothiocyanates and indoles upon cell disruption; cooking partially inactivates myrosinase, reducing conversion efficiency. Polyphenols: chlorogenic acid, sinapic acid derivatives, and quercetin glycosides present; sprout tissue documented at up to 125.7mg gallic acid equivalents per gram dry weight, substantially exceeding root concentrations. Carotenoids: beta-carotene approximately 10mcg per 100g (low compared to orange-fleshed vegetables). Anthocyanins: trace amounts in purple-skinned varieties. Fiber composition: mix of soluble pectin (~0.5g) and insoluble cellulose/hemicellulose (~1.8g); supports [prebiotic](/ingredients/condition/gut-health) activity. Bioavailability notes: Vitamin C losses of 30-50% reported with boiling; consuming raw or lightly steamed preserves glucosinolate conversion potential; potassium and water-soluble B vitamins leach into cooking water.

## Dosage & Preparation

No clinically studied dosage ranges exist for rutabaga extracts or standardized preparations in humans. As a whole food vegetable, typical culinary portions are approximately 100g. The in vitro research used methanol extracts at unspecified concentrations. 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 healthy adults; however, its high glucosinolate content may interfere with [thyroid](/ingredients/condition/hormonal) iodine uptake when consumed in very large quantities, particularly in individuals with pre-existing hypothyroidism or iodine deficiency. Patients taking anticoagulants such as warfarin should be aware that rutabaga contains vitamin K, which may reduce anticoagulant efficacy and warrants monitoring of INR levels. Individuals with irritable bowel syndrome or FODMAP sensitivities may experience gas and bloating due to fermentable carbohydrates present in rutabaga. Insufficient safety data exist for high-dose rutabaga extracts or concentrates during pregnancy and lactation, so supplemental forms beyond normal dietary intake are not recommended during these periods.

## Scientific Research

Human clinical trials for rutabaga are completely absent from the literature. The only peer-reviewed research is a single in vitro study (PMID: 23957358) published in the Journal of Medicinal Food (2013) examining rutabaga extracts in Chinese hamster ovary and human hepatoma cell cultures. No randomized controlled trials, meta-analyses, or human studies exist for therapeutic applications.

## Historical & Cultural Context

While no traditional medicinal uses are documented, rutabaga has been a culinary staple in Northern Europe and North America. The vegetable has cultural significance in Scotland, Northern England, Wales, Isle of Man, and Ireland, where carved rutabaga roots were traditionally used as Jack-o'-lanterns at Halloween.

## Synergistic Combinations

Other cruciferous vegetables, iodine, vitamin C, polyphenol-rich foods, [antioxidant](/ingredients/condition/antioxidant)s

## Frequently Asked Questions

### How much polyphenol does rutabaga contain compared to other vegetables?

Rutabaga sprouts have been measured at up to 125.7 mg gallic acid equivalents (GAE) per gram dry weight in in vitro studies, which is notably high compared to mature root vegetables. However, mature rutabaga roots contain significantly lower polyphenol concentrations than sprouts, and direct comparisons to standardized polyphenol-rich foods like blueberries require caution due to differing measurement methods.

### Can rutabaga help prevent cancer?

Laboratory studies show that isothiocyanates derived from rutabaga glucosinolates can selectively induce apoptosis in cancer cell lines while sparing normal cells, likely through HDAC inhibition and modulation of Bcl-2 family proteins. These findings are strictly preclinical; no human clinical trials have evaluated rutabaga for cancer prevention or treatment, so it cannot currently be recommended as a therapeutic agent for cancer.

### Does rutabaga affect thyroid function?

Rutabaga contains goitrogenic glucosinolates that, when hydrolyzed, can produce compounds competing with iodine uptake in the thyroid gland, potentially suppressing thyroid hormone synthesis in susceptible individuals. This risk is most relevant to people with existing hypothyroidism or iodine deficiency consuming very large amounts; cooking rutabaga partially inactivates myrosinase, reducing goitrogenic potential by approximately 30–60%.

### What vitamins and minerals does rutabaga provide?

Rutabaga is a meaningful source of vitamin C (approximately 25 mg per 100 g raw), potassium (roughly 305 mg per 100 g), and folate, along with smaller amounts of vitamin K, manganese, and dietary fiber. Its vitamin C content contributes to collagen synthesis and immune function, while its potassium supports cardiovascular health through sodium-potassium ATPase regulation.

### Is there a difference in nutrients between rutabaga sprouts and the root vegetable?

Yes, rutabaga sprouts are considerably more concentrated in glucosinolates and polyphenols than the mature root, with sprout polyphenol levels reaching up to 125.7 mg GAE/g dry weight in research settings compared to far lower levels in the edible root. The mature root is nutritionally valued primarily for its vitamin C, fiber, and mineral content rather than high-concentration phytochemicals, making sprouts the focus of most antioxidant and anti-cancer research.

### What is the difference between rutabaga root and rutabaga sprouts in terms of antioxidant content?

Rutabaga sprouts contain significantly higher polyphenol concentrations than the mature root vegetable, with sprouts reaching up to 125.7 mg gallic acid equivalents per gram in laboratory studies. This makes sprouts a more concentrated source of antioxidants, though both forms contribute to overall dietary antioxidant intake. The sprouting process appears to upregulate polyphenol synthesis compared to the unsprouted root.

### Is rutabaga safe for people taking blood thinners or anticoagulant medications?

Rutabaga contains vitamin K, which can interact with anticoagulant medications like warfarin by reducing their effectiveness. People taking blood thinners should maintain consistent rutabaga intake rather than dramatically increasing or decreasing consumption, and should consult their healthcare provider about appropriate dietary levels. The amount of vitamin K in typical serving sizes is generally manageable with medical supervision.

### What does current research show about rutabaga sprout extracts and cancer cell activity?

In vitro laboratory studies demonstrate that rutabaga sprout extracts can induce apoptosis (programmed cell death) in human hepatoma cancer cells while showing selectivity for cancer cells over normal mammalian cells. However, this evidence is limited to cell culture studies and has not been validated in animal models or human clinical trials. Significantly more research is needed before any cancer-preventive claims can be made for human consumption.

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