# Broccoli Raab (Brassica rapa subsp. rapa)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/broccoli-raab
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Brassica rapa subsp. rapa, rapini, broccoli rabe, cime di rapa, friarielli, turnip tops, broccoletti

## Overview

Broccoli raab contains high concentrations of glucosinolates that break down into bioactive compounds like indoles and isothiocyanates. These compounds activate detoxification enzymes and may reduce prostate cancer risk while providing exceptional vitamin K content at 187% daily value per 100g serving.

## Health Benefits

• May reduce prostate cancer risk through glucosinolate breakdown products like indoles and isothiocyanates (epidemiological observations from U.S., Netherlands, and European studies)
• Provides exceptional vitamin K content at 187% DV per 100g raw serving (nutritional analysis)
• Delivers high [antioxidant activity](/ingredients/condition/antioxidant) through phenolics including chlorogenic acid, ferulic acid, and flavonols like quercetin and kaempferol (compositional studies)
• Supports folate intake with 21% DV per 100g raw and high fiber content of 4.8g per 170g boiled serving (nutritional data)
• Contains GABA which increases over 2300% during storage, though human biochemical impacts remain unstudied (post-harvest analysis)

## Mechanism of Action

Glucosinolates in broccoli raab are hydrolyzed by myrosinase enzyme to form indoles and isothiocyanates. These compounds activate [phase II detox](/ingredients/condition/detox)ification enzymes including glutathione S-transferase and quinone reductase. Indole-3-carbinol modulates estrogen [metabolism](/ingredients/condition/weight-management) through CYP1A1 and CYP1B1 pathways.

## Clinical Summary

Epidemiological studies from the U.S., Netherlands, and Europe show inverse associations between cruciferous vegetable intake and prostate cancer risk, though specific broccoli raab trials are limited. Most evidence comes from observational studies rather than controlled trials. Meta-analyses suggest 10-20% risk reduction with regular cruciferous vegetable consumption. Direct clinical data on broccoli raab specifically remains sparse.

## Nutritional Profile

Broccoli Raab (rapini) per 100g raw: Calories ~22 kcal, Protein ~3.2g (notably high for a leafy vegetable, containing all essential amino acids), Carbohydrates ~2.9g, Dietary Fiber ~2.7g, Fat ~0.5g. Key Vitamins: Vitamin K1 (phylloquinone) ~224 µg (187% DV) — bioavailability enhanced by dietary fat co-consumption; Vitamin C ~20–29 mg (~30% DV) — heat-labile, significantly reduced by boiling; Vitamin A (as beta-carotene) ~126 µg RAE (~14% DV); Folate (B9) ~83 µg (~21% DV); Riboflavin (B2) ~0.14 mg; Vitamin E ~2.1 mg. Key Minerals: Calcium ~108 mg (~8% DV, though bioavailability partially limited by oxalates ~200 mg/100g); Potassium ~196 mg; Phosphorus ~73 mg; Iron ~2.1 mg (non-heme, bioavailability ~5–12%, enhanced by co-consumed vitamin C); Magnesium ~22 mg; Zinc ~0.77 mg; Manganese ~0.39 mg. Bioactive Compounds: Glucosinolates ~60–120 µmol/g dry weight, predominantly gluconapin and glucobrassicin — hydrolyzed by myrosinase enzyme upon cell disruption to isothiocyanates (e.g., allyl isothiocyanate) and indole-3-carbinol; Phenolic acids including chlorogenic acid (~50–80 mg/100g) and ferulic acid (~15–25 mg/100g); Flavonols including quercetin glycosides (~10–30 mg/100g) and kaempferol; Carotenoids: lutein + zeaxanthin ~1.4 mg/100g (fat-soluble, bioavailability enhanced by lipid co-ingestion); Chlorophyll ~50–100 mg/100g. Bioavailability Notes: Cooking (especially boiling) leaches water-soluble vitamins (C, folate) and glucosinolates by up to 40–60%; steaming preserves ~85% of glucosinolates; oxalate content moderately reduces calcium and iron absorption; raw or lightly steamed preparation maximizes myrosinase activity and isothiocyanate yield.

## Dosage & Preparation

No clinically studied dosage ranges exist for broccoli raab extracts or standardized forms. Typical consumption as whole food provides: 100g raw (22 kcal) with high vitamin K (187% DV), vitamin C (22% DV), and folate (21% DV); 170g boiled (42 kcal) with fiber (4.8g), vitamin A (43% DV), and vitamin C (70% DV). Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Broccoli raab is generally safe for most people when consumed as food. High vitamin K content may interfere with warfarin and other anticoagulant medications. Raw consumption in large quantities may suppress [thyroid function](/ingredients/condition/hormonal) due to goitrogens, particularly in those with iodine deficiency. Pregnancy and breastfeeding safety follows standard vegetable consumption guidelines.

## Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses specifically on broccoli raab were identified in the available research. Current evidence consists primarily of epidemiological observations linking higher intake to lower prostate cancer risk and compositional analyses of nutritional content and storage quality.

## Historical & Cultural Context

Broccoli raab has no documented historical use in formal traditional medicine systems like Ayurveda or TCM. It is primarily a culinary vegetable associated with Mediterranean cuisine, especially Italian cooking, valued for its bitter, nutty flavor and spread globally through migration from its Western Asia/Eastern Mediterranean origins.

## Synergistic Combinations

Other cruciferous vegetables, vitamin C, selenium, quercetin, sulforaphane

## Frequently Asked Questions

### How much vitamin K is in broccoli raab?

Broccoli raab contains 187% of the daily value for vitamin K per 100g raw serving. This exceptionally high content makes it one of the richest dietary sources of vitamin K1 (phylloquinone).

### What makes broccoli raab different from regular broccoli?

Broccoli raab (Brassica rapa) is more closely related to turnips than broccoli and has higher concentrations of bitter glucosinolates. It provides more vitamin K and different glucosinolate profiles compared to regular broccoli (Brassica oleracea).

### Can broccoli raab help prevent cancer?

Epidemiological studies suggest broccoli raab's glucosinolate breakdown products may reduce prostate cancer risk by 10-20%. However, most evidence comes from observational studies of cruciferous vegetables generally, not specific clinical trials of broccoli raab alone.

### Should I eat broccoli raab raw or cooked?

Light cooking (steaming 3-4 minutes) may optimize glucosinolate bioavailability by partially inactivating ESP protein while preserving myrosinase enzyme. Overcooking destroys beneficial compounds, while raw consumption maximizes vitamin K but may reduce glucosinolate absorption.

### Does broccoli raab interfere with thyroid function?

Broccoli raab contains goitrogens that may suppress thyroid function when consumed raw in large quantities, especially with concurrent iodine deficiency. Cooking reduces goitrogenic activity, and normal dietary amounts are unlikely to cause thyroid problems in healthy individuals.

### How does cooking affect the glucosinolates and isothiocyanates in broccoli raab?

Cooking broccoli raab can reduce glucosinolate content by 30-50% depending on the method, as heat denatures the enzyme myrosinase needed to convert glucosinolates into bioactive isothiocyanates. Light steaming (3-5 minutes) preserves more glucosinolates than boiling, while brief sautéing offers a middle ground that maintains both nutritional compounds and palatability. For maximum isothiocyanate production, lightly cooking or chopping raw broccoli raab and allowing it to rest before consumption can enhance the conversion process.

### Is broccoli raab safe to consume regularly while taking blood thinners like warfarin?

Broccoli raab contains 187% of the daily value of vitamin K per 100g serving, which can interfere with warfarin efficacy by promoting blood clotting; consistent consumption is safe only with stable, monitored intake levels and medical supervision. People taking anticoagulants should consult their healthcare provider before significantly increasing broccoli raab consumption, as vitamin K can reduce the medication's anticoagulant effect. Maintaining consistent vitamin K intake rather than avoiding it entirely is the preferred approach for warfarin users.

### What is the bioactive difference between broccoli raab and broccoli sprouts for cancer prevention?

Broccoli sprouts contain 20-50 times more glucosinolates and sulforaphane (the primary isothiocyanate) compared to mature broccoli raab, making sprouts more concentrated for chemoprotective purposes. However, broccoli raab provides additional phenolic antioxidants (chlorogenic acid, ferulic acid, and quercetin) that sprouts contain in lower amounts, offering a broader spectrum of bioactive compounds. Both forms contribute to prostate cancer risk reduction through different mechanisms, so incorporating both into your diet provides complementary phytochemical benefits.

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