# Brassica rapa var. pekinensis (Napa Cabbage)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/brassica-rapa-var-pekinensis
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Brassica rapa var. pekinensis, Chinese cabbage, Pe-tsai, Wombok, Celery cabbage, Hakusai, Wong nga baak

## Overview

Napa cabbage contains glucosinolates like glucoerucin and neoglucobrassicin that break down into bioactive compounds with potential anticancer properties. The vegetable also provides [antimicrobial](/ingredients/condition/immune-support) compounds including 1,2-benzenedicarboxylic acid that may inhibit bacterial enzymes.

## Health Benefits

• [Antimicrobial](/ingredients/condition/immune-support) activity through compounds like 1,2-benzenedicarboxylic acid that inhibit bacterial LpxC enzyme (in vitro evidence only)
• Potential cancer-protective effects from glucosinolates like glucoerucin, neoglucobrassicin, and glucobrassicin (mechanistic studies, no human trials)
• [Antioxidant](/ingredients/condition/antioxidant) properties from total phenols (62.6 mg GAE/g) and flavonoids (27.6 mg QE/g) in chloroform extracts (laboratory analysis only)
• Nutritional support providing vitamin C (26 mg/100g), calcium (1.40 mg/kg DW), and iron (558 mg/kg DW) (compositional data)
• May support detoxification enzyme induction through isothiocyanate metabolites (theoretical mechanism from broader Brassica research)

## Mechanism of Action

Glucosinolates in napa cabbage are hydrolyzed by myrosinase enzymes to form isothiocyanates and indoles that can modulate [phase II detox](/ingredients/condition/detox)ification enzymes and induce apoptosis in cancer cells. The compound 1,2-benzenedicarboxylic acid specifically targets the bacterial LpxC enzyme, disrupting lipopolysaccharide biosynthesis in gram-negative bacteria.

## Clinical Summary

Current evidence for napa cabbage's health benefits comes primarily from in vitro mechanistic studies examining its glucosinolate content and [antimicrobial](/ingredients/condition/immune-support) activity. No randomized controlled trials have specifically tested napa cabbage supplements or extracts in humans. Observational studies on cruciferous vegetable consumption generally suggest protective effects against certain cancers, but these cannot isolate napa cabbage's specific contribution. The antimicrobial evidence is limited to laboratory studies using bacterial cultures.

## Nutritional Profile

Napa cabbage (Brassica rapa var. pekinensis) is a low-calorie vegetable (~16 kcal/100g fresh weight) with the following documented composition: MACRONUTRIENTS: Carbohydrates ~3.2g/100g, Dietary fiber ~1.2g/100g (mix of soluble pectin and insoluble cellulose/hemicellulose), Protein ~1.2g/100g (relatively high for a leafy vegetable), Fat ~0.2g/100g, Water ~94-95g/100g. VITAMINS: Vitamin C ~27-45mg/100g fresh weight (bioavailability moderate, heat-sensitive), Vitamin K1 ~42-60µg/100g (fat-soluble, bioavailability enhanced with dietary fat), Folate (B9) ~79-90µg/100g (good plant source, though bioavailability ~50% compared to synthetic folic acid), Vitamin A precursors (beta-carotene ~60µg/100g, conversion efficiency to retinol is low ~1:12 ratio), Vitamin B6 ~0.23mg/100g. MINERALS: Calcium ~77mg/100g (bioavailability reduced by oxalates, estimated ~50% absorption vs dairy), Potassium ~238mg/100g (highly bioavailable), Phosphorus ~29mg/100g, Magnesium ~13mg/100g, Iron ~0.31mg/100g (non-heme, low bioavailability ~5-12%, enhanced by co-consumed vitamin C), Zinc ~0.23mg/100g, Manganese ~0.19mg/100g, Selenium trace amounts (~0.6µg/100g, soil-dependent). BIOACTIVE COMPOUNDS: Glucosinolates (total ~1.5-4.0µmol/g dry weight) including glucobrassicin (~0.8-1.2µmol/g dw), neoglucobrassicin (~0.3-0.6µmol/g dw), and glucoerucin (~0.2-0.5µmol/g dw); these are hydrolyzed by myrosinase enzyme (activated by chopping/chewing) into bioactive isothiocyanates and indoles — cooking partially inactivates myrosinase, reducing conversion efficiency. Total phenolic content: ~62.6mg GAE/g in chloroform extract (concentrate basis), with fresh weight values substantially lower (~15-25mg GAE/100g); flavonoids: ~27.6mg QE/g in chloroform extract. Specific phenolics include hydroxycinnamic acids (sinapic acid, ferulic acid) and flavonols (kaempferol, quercetin glycosides). Anthocyanins present in purple varieties but minimal in standard pale-leaf cultivars. Carotenoids include lutein/zeaxanthin (~500-700µg/100g combined, bioavailability enhanced with fat). 1,2-Benzenedicarboxylic acid (phthalic acid derivative) identified in extracts with in vitro [antimicrobial](/ingredients/condition/immune-support) activity. BIOAVAILABILITY NOTES: Raw consumption preserves myrosinase activity for glucosinolate conversion; light steaming (~3-5 min) retains ~70% vitamin C; fermentation (kimchi preparation) increases bioavailability of some B vitamins through microbial synthesis and reduces antinutrient content.

## Dosage & Preparation

No clinically studied dosage ranges have been established for Napa cabbage extracts or standardized forms due to absence of human trials. Research studies used chloroform extracts for qualitative analysis without specified dosing protocols. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Napa cabbage as a food is generally safe for most people when consumed in normal dietary amounts. Raw cruciferous vegetables contain goitrogens that may interfere with [thyroid function](/ingredients/condition/hormonal) in individuals with existing thyroid conditions or iodine deficiency. No specific drug interactions have been reported for napa cabbage, but its vitamin K content could theoretically affect anticoagulant medications. Pregnant and breastfeeding women can safely consume napa cabbage as part of a balanced diet.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specifically on Brassica rapa var. pekinensis were identified. Research is limited to in vitro biochemical analyses examining [antimicrobial](/ingredients/condition/immune-support) effects via LpxC protein binding and phytochemical profiling studies identifying glucosinolates and phenolic compounds.

## Historical & Cultural Context

Napa cabbage has been cultivated in China for centuries as a staple vegetable, though no specific medicinal uses in traditional medicine systems are documented. It is primarily recognized for its nutritional value rather than therapeutic applications.

## Synergistic Combinations

Broccoli sprouts, turmeric, green tea extract, vitamin C, selenium

## Frequently Asked Questions

### What glucosinolates are found in napa cabbage?

Napa cabbage contains several glucosinolates including glucoerucin, neoglucobrassicin, and glucobrassicin. These compounds break down into bioactive metabolites like isothiocyanates that may have anticancer properties.

### Does napa cabbage have antimicrobial properties?

Laboratory studies show napa cabbage contains 1,2-benzenedicarboxylic acid, which can inhibit the bacterial LpxC enzyme in gram-negative bacteria. However, this antimicrobial activity has only been demonstrated in test tube studies, not in humans.

### Is napa cabbage safe for people with thyroid problems?

Raw napa cabbage contains goitrogens that may interfere with thyroid hormone production, particularly in people with existing thyroid conditions or iodine deficiency. Cooking reduces goitrogen content and may be safer for those with thyroid concerns.

### How much napa cabbage should I eat for health benefits?

No specific dosage recommendations exist for napa cabbage's health benefits since human clinical trials are lacking. General dietary guidelines suggest 2-3 servings of cruciferous vegetables per week as part of a balanced diet.

### Can napa cabbage supplements replace eating the whole vegetable?

No commercial napa cabbage supplements are widely available, and whole food consumption is generally preferred over isolated compounds. The vegetable provides fiber, vitamins, and minerals alongside its bioactive compounds, offering more comprehensive nutritional benefits.

### What is the difference between fresh napa cabbage and napa cabbage supplements or extracts?

Fresh napa cabbage contains the full spectrum of nutrients including fiber, water-soluble vitamins, and minerals, while supplements typically concentrate specific compounds like glucosinolates or phenolic antioxidants through extraction processes. Extracted forms may have higher concentrations of bioactive compounds per dose, but lack the synergistic effect of whole-food nutrients and dietary fiber present in fresh vegetables. Research on napa cabbage health benefits has primarily studied whole vegetable consumption rather than isolated supplement forms, making fresh consumption the more evidence-supported approach.

### What research evidence exists for napa cabbage's cancer-protective effects?

Current evidence for napa cabbage's anti-cancer potential comes from mechanistic laboratory studies showing that glucosinolates (glucoerucin, neoglucobrassicin, and glucobrassicin) can theoretically modulate cancer pathways in cell cultures. However, no human clinical trials have directly tested whether eating napa cabbage reduces cancer risk in people, meaning these benefits remain promising but unproven in clinical settings. The extrapolation from test-tube studies to real-world cancer prevention in humans requires substantial additional research before making definitive health claims.

### Which populations would benefit most from regular napa cabbage consumption?

Individuals seeking antioxidant-rich foods, those interested in glucosinolate-containing vegetables, and people following a nutrient-dense whole-food diet would benefit from regular napa cabbage intake due to its documented phenolic content (62.6 mg GAE/g) and flavonoid levels (27.6 mg QE/g). People with inflammatory conditions or those looking to diversify their cruciferous vegetable intake beyond common varieties like broccoli may find napa cabbage particularly valuable. Those with iodine deficiency concerns should consume napa cabbage in moderation and pair it with adequate iodine sources, though typical dietary amounts are generally considered safe.

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