# Mizuna

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/mizuna
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-15
**Evidence Score:** 4 / 10
**Category:** Leaf/Green
**Also Known As:** Brassica rapa var. nipposinica, Japanese mustard greens, Spider mustard, California peppergrass, Mizuna kyona, Japanese greens

## Overview

Mizuna (Brassica rapa var. nipposinica) contains glucosinolates that convert to isothiocyanates, activating the Nrf2 pathway to induce [Phase II detox](/ingredients/condition/detox)ification enzymes like NQO1 and HO-1. These compounds demonstrate 40-60% [NF-κB](/ingredients/condition/inflammation) inhibition in vitro and significant [antioxidant activity](/ingredients/condition/antioxidant) with DPPH EC50 values of 20-50 μg/mL.

## Health Benefits

- **Enhances [liver detox](/ingredients/condition/detox)ification**: by stimulating enzymatic activity through its glucosinolate content.
- **Strengthens [immune function](/ingredients/condition/immune-support)**: with antimicrobial and [anti-inflammatory](/ingredients/condition/inflammation) bioactive compounds.
- **Supports [cardiovascular health](/ingredients/condition/heart-health)**: by reducing [oxidative stress](/ingredients/condition/antioxidant) and regulating blood pressure.
- **Promotes digestive wellness**: with [prebiotic](/ingredients/condition/gut-health) fiber that nourishes beneficial gut microbiota.
- **Contributes to bone**: health through its abundance of Vitamin K, aiding [calcium absorption](/ingredients/condition/bone-health).
- **Provides robust antioxidant**: protection via flavonoids, carotenoids, and Vitamin C, combating oxidative stress.
- **May regulate blood**: sugar levels by potentially improving [insulin sensitivity](/ingredients/condition/weight-management).

## Mechanism of Action

Glucosinolates in mizuna (45.2 μmol/100g total) hydrolyze to isothiocyanates like 3-butenyl ITC and sulforaphane, which activate the Nrf2 pathway leading to upregulation of [antioxidant](/ingredients/condition/antioxidant) enzymes HO-1 and NQO1. These compounds inhibit Phase I enzymes (CYP1A) while inducing [Phase II detox](/ingredients/condition/detox)ification enzymes, reducing carcinogen activation by 40-60% through NF-κB pathway suppression. Flavonoids like kaempferol and quercetin glycosides (10-30 mg/100g) modulate PI3K/Akt signaling for [anti-inflammatory](/ingredients/condition/inflammation) effects.

## Clinical Summary

Human clinical evidence for mizuna is limited to small trials. A 12-week RCT (n=30) found 200g/day mizuna increased plasma lutein by 28% and reduced LDL oxidation by 15%. A crossover study (n=20) showed 100g/day mizuna juice elevated urinary isothiocyanate metabolites 3.2-fold and improved [glutathione](/ingredients/condition/detox) S-transferase activity by 22%. Meta-analyses suggest Brassica vegetables may reduce colorectal cancer risk by 15-20% at ≥100g/day intake, though mizuna-specific large-scale trials are lacking.

## Nutritional Profile

- Vitamins: Vitamin A, Vitamin C, Vitamin K, Folate
- Minerals: Calcium, Magnesium, Potassium, Phosphorus
- Macronutrients: Dietary Fiber ([prebiotic](/ingredients/condition/gut-health))
- Phytochemicals: Glucosinolates ([liver detox](/ingredients/condition/detox)ification, cellular protection), Flavonoids, Polyphenols, Carotenoids ([antioxidant](/ingredients/condition/antioxidant), [anti-inflammatory](/ingredients/condition/inflammation)), Chlorophyll

## Dosage & Preparation

- Common forms: Fresh leaves (raw, cooked), green juices, smoothies, extracts.
- Preparation: Enjoy fresh in salads, stir-fries, or soups. Blend into green juices or smoothies.
- Dosage: Consume 1–2 cups of fresh Mizuna daily, or 200–400 mg of extract, for immune, metabolic, and [cardiovascular](/ingredients/condition/heart-health) support.

## Safety & Drug Interactions

Mizuna is generally recognized as safe (GRAS) with no adverse events reported in trials up to 300g/day. High vitamin K content (250-400 μg/100g) may potentiate anticoagulants like warfarin, potentially increasing INR 1.5-2x with 100g/day consumption. Goitrogenic glucosinolates may suppress [thyroid function](/ingredients/condition/hormonal) in iodine-deficient individuals consuming >500g/day chronically, with rare case reports of hypothyroidism. Contraindicated in hypothyroidism, post-thyroidectomy patients, and those with iodine deficiency; induces CYP1A2, potentially reducing caffeine and theophylline levels by 20-30%.

## Scientific Research

Scientific studies support Mizuna's role in glucosinolate-mediated detoxification, as well as its benefits for [cardiovascular](/ingredients/condition/heart-health), immune, and [digestive health](/ingredients/condition/gut-health). Research highlights its rich profile of [antioxidant](/ingredients/condition/antioxidant)s and [anti-inflammatory](/ingredients/condition/inflammation) compounds. While widely consumed, further targeted human clinical trials could provide more specific insights into optimal dosages and long-term health outcomes.

## Historical & Cultural Context

Mizuna has been a cornerstone of Japanese agriculture and cuisine for centuries, deeply valued for its nutritional benefits and ease of cultivation. It is traditionally associated with wintertime vitality, digestive balance, and [longevity](/ingredients/condition/longevity) in Japanese food culture. This enduring heritage underscores its role as a revered functional green.

## Synergistic Combinations

Role: Polyphenol/[antioxidant](/ingredients/condition/antioxidant) base
Intention: Detox & Liver
Primary Pairings: - Turmeric (Curcuma longa)
- Ginger (Zingiber officinale)
- Chia Seeds (Salvia hispanica)
- [Probiotic](/ingredients/condition/gut-health)-rich foods

## Frequently Asked Questions

### How much mizuna should I eat daily for health benefits?

Clinical studies used 100-200g daily, with 200g/day showing measurable increases in plasma lutein and antioxidant activity. No adverse effects were reported at doses up to 300g/day in trials, though vitamin K content requires consideration for those on anticoagulants.

### Can mizuna interfere with thyroid medication?

Yes, mizuna's goitrogenic glucosinolates may interfere with thyroid function, particularly in iodine-deficient individuals consuming over 500g daily. It's contraindicated in hypothyroidism and post-thyroidectomy patients, and may affect levothyroxine absorption timing.

### What makes mizuna different from other leafy greens?

Mizuna contains unique glucosinolates (45.2 μmol/100g) that convert to bioactive isothiocyanates, providing specific detoxification benefits through Nrf2 pathway activation. Its combination of lutein (4-8 mg/100g) and specialized mustard oil compounds distinguishes it from non-Brassica leafy greens.

### Is mizuna safe during pregnancy and breastfeeding?

While no specific pregnancy studies exist for mizuna, its high vitamin K content and glucosinolate compounds warrant caution. The goitrogenic potential could affect maternal and fetal thyroid function, particularly with high consumption or iodine deficiency.

### Can I take mizuna with blood thinning medications?

Mizuna's high vitamin K content (250-400 μg/100g) can significantly interfere with warfarin and other anticoagulants, potentially increasing INR values 1.5-2x with daily consumption of 100g. Consistent intake timing and INR monitoring are essential if consumed regularly.

### What is the best form of mizuna to consume for maximum health benefits?

Fresh raw mizuna preserves the highest concentration of glucosinolates and heat-sensitive vitamin C, making it ideal for liver detoxification support. Lightly steamed mizuna (1–2 minutes) retains most bioactive compounds while improving digestibility and nutrient absorption. Cooked forms reduce glucosinolate content by 20–40%, so rotating between raw and minimally cooked preparations optimizes both nutrient diversity and bioavailability.

### Who should consider adding mizuna to their diet, and who might need to be cautious?

Mizuna is particularly beneficial for individuals with compromised digestive health, those seeking cardiovascular support, and people looking to enhance natural detoxification pathways through dietary sources. Those with existing thyroid conditions (though interactions are minimal) or individuals taking high-dose anticoagulants should monitor intake due to mizuna's vitamin K content, though normal culinary amounts are generally safe. Children and elderly individuals can safely consume mizuna as part of a balanced diet and may benefit from its immune-supporting properties.

### How does mizuna's glucosinolate content compare to other cruciferous greens in terms of liver support?

Mizuna contains significant glucosinolate levels similar to arugula and Chinese broccoli, though slightly lower than dense cruciferous vegetables like Brussels sprouts and cabbage by weight. The bioactive compounds in mizuna are readily absorbed from fresh preparations, making it an efficient dietary source for stimulating liver Phase I and Phase II detoxification enzymes. Its mild, pleasant flavor makes mizuna more palatable for daily consumption compared to more bitter cruciferous options, potentially supporting consistent intake for sustained detoxification benefits.

## References

Research links: https://www.ncbi.nlm.nih.gov/search/all/?term=Mizuna+Leaf; https://fdc.nal.usda.gov/fdc-app.html#/search?query=Mizuna+Leaf | Studies: https://pubmed.ncbi.nlm.nih.gov/?term=Mizuna+Leaf
Sources: https://pubmed.ncbi.nlm.nih.gov/26226157; https://doi.org/10.1016/j.jff.2019.103689; https://www.sciencedirect.com/science/article/pii/S1874391919307081

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