# Potherb Mustard (Brassica juncea)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/potherb-mustard
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-30
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Brassica juncea, Brown mustard, Chinese mustard, Indian mustard, Leaf mustard, Oriental mustard, Mustard greens, Gai choy, Kai choi, Sarson ka saag, Pickled mustard greens, Asian mustard cabbage

## Overview

Potherb mustard (Brassica juncea) is a dark leafy green concentrated in sinapine (2.62–36.5 mg/g dry weight) and sinapic acid, phenylpropanoid compounds that scavenge [free radical](/ingredients/condition/antioxidant)s and inhibit pro-[inflammatory](/ingredients/condition/inflammation) enzymes. It also delivers high levels of vitamin K and vitamin C, supporting coagulation pathways and antioxidant defense respectively.

## Health Benefits

• Traditional diuretic and expectorant properties (evidence quality: traditional use only, no clinical trials available)
• Rich source of [antioxidant](/ingredients/condition/antioxidant) phenolics including sinapine (2.62-36.5 mg/g DW) and sinapic acid (evidence quality: biochemical analysis only)
• High vitamin C and vitamin K content supporting nutritional status (evidence quality: nutrient composition data)
• Contains glucosinolates that hydrolyze to bioactive isothiocyanates (evidence quality: in-vitro mechanisms only)
• Traditional stimulant effects in Asian folk medicine systems (evidence quality: historical use only)

## Mechanism of Action

Sinapic acid, a hydroxycinnamic acid derivative abundant in Brassica juncea, inhibits [lipid peroxidation](/ingredients/condition/antioxidant) by donating hydrogen atoms to peroxyl radicals and suppresses NF-κB signaling, reducing downstream expression of COX-2 and [pro-inflammatory cytokine](/ingredients/condition/inflammation)s. Sinapine (sinapoylcholine) acts as a choline ester that may modulate cholinergic activity while also contributing to DPPH and ABTS radical neutralization through its phenolic hydroxyl and methoxy substituents. Vitamin K activates γ-glutamyl carboxylase, enabling post-translational carboxylation of coagulation factors II, VII, IX, and X, while vitamin C regenerates oxidized [glutathione](/ingredients/condition/detox) and supports collagen hydroxylation via prolyl hydroxylase enzymes.

## Clinical Summary

No published randomized controlled trials or human clinical studies have specifically investigated oral supplementation or dietary intake of Brassica juncea potherb for health outcomes. Evidence for its [antioxidant](/ingredients/condition/antioxidant) capacity derives from in vitro biochemical assays (DPPH, FRAP, ABTS methods) and phytochemical analyses documenting sinapine concentrations of 2.62–36.5 mg/g dry weight across cultivars. Traditional use as a diuretic and expectorant is documented in ethnobotanical literature, but no controlled human trials have quantified urinary output, mucus clearance, or other measurable endpoints. Broader research on Brassica genus glucosinolates offers indirect mechanistic context, but direct clinical translation to potherb mustard specifically cannot be made at this time.

## Nutritional Profile

Potherb Mustard (Brassica juncea) is a low-calorie leafy green (~26-32 kcal/100g fresh weight) with a notable micronutrient and bioactive compound profile. Macronutrients: protein 2.7-3.5g/100g FW, dietary fiber 3.2-3.8g/100g FW, carbohydrates 4.7-5.2g/100g FW, fat 0.2-0.4g/100g FW. Key micronutrients: Vitamin K1 (phylloquinone) 257-593 µg/100g FW (321-741% DV) — bioavailability enhanced by co-consumption with dietary fat; Vitamin C 70-130mg/100g FW (78-144% DV) — heat-labile, significantly reduced by cooking; Vitamin A (as beta-carotene) 222-300 µg RAE/100g FW; Folate 12-187 µg/100g FW; Calcium 115-210mg/100g FW — bioavailability partially limited by moderate oxalate content (~50-90mg/100g FW); Potassium 354-496mg/100g FW; Iron 1.5-2.7mg/100g FW — non-heme form, absorption enhanced by co-consumed vitamin C. Bioactive compounds: Glucosinolates (primarily sinigrin and gluconapin) 2.1-8.4 µmol/g DW, hydrolyzed to allyl isothiocyanate and other bioactive metabolites upon myrosinase activity during tissue disruption — myrosinase inactivated by cooking, reducing conversion efficiency; Phenolic compounds including sinapine 2.62-36.5mg/g DW and sinapic acid (concentrations vary significantly by cultivar, growth stage, and processing method); Chlorophyll a and b contributing [antioxidant](/ingredients/condition/antioxidant) capacity; Quercetin and kaempferol glycosides present at low but measurable levels (~0.1-1.2mg/100g FW). Bioavailability notes: glucosinolate-derived isothiocyanates are best preserved in raw or lightly steamed preparations; fat-soluble vitamins (K, carotenoids) require dietary lipids for optimal absorption; oxalates and phytates may moderately reduce mineral bioavailability in populations relying heavily on this vegetable as a primary mineral source.

## Dosage & Preparation

No clinically studied dosage ranges are available for Brassica juncea potherb mustard extracts, powders, or standardized forms, as no human trials have been conducted. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Brassica juncea contains glucosinolates that are hydrolyzed to goitrogenic compounds (goitrin, thiocyanates) by myrosinase, potentially suppressing [thyroid](/ingredients/condition/hormonal) peroxidase activity and iodine uptake when consumed in large quantities, particularly in individuals with pre-existing hypothyroidism or iodine deficiency. Its high vitamin K content (comparable to other dark leafy Brassicas) may antagonize warfarin (coumadin) anticoagulation therapy; patients on vitamin K antagonists should maintain consistent intake and monitor INR closely. Potherb mustard is generally recognized as food-safe at culinary doses, but concentrated extracts or supplements have no established safety profile from controlled trials. Pregnancy safety at supplemental doses is unstudied; culinary consumption is considered low-risk, but high-dose preparations should be avoided due to absent safety data.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specifically on Brassica juncea potherb mustard were identified in the available research. The evidence base consists primarily of compositional analyses and traditional use documentation.

## Historical & Cultural Context

In folk medicine, B. juncea leaves have served as stimulants, expectorants, and diuretics within Asian traditional systems for medicinal purposes. The plant is also consumed as pickled potherb mustard in Chinese cuisine for its distinctive flavor.

## Synergistic Combinations

Cruciferous vegetables, vitamin C, selenium, folate, omega-3 fatty acids

## Frequently Asked Questions

### What is sinapine in potherb mustard and what does it do?

Sinapine is a choline ester of sinapic acid found in Brassica juncea at concentrations ranging from 2.62 to 36.5 mg per gram of dry weight depending on cultivar and growing conditions. It functions as a potent antioxidant by neutralizing free radicals through its phenolic ring structure, and emerging research suggests it may modulate cholinergic signaling, though human clinical evidence for this effect is lacking.

### Can potherb mustard interact with blood thinners like warfarin?

Yes, potherb mustard is rich in vitamin K1 (phylloquinone), which directly opposes the mechanism of warfarin by supporting the carboxylation of clotting factors II, VII, IX, and X via γ-glutamyl carboxylase. Patients taking warfarin or other vitamin K antagonists should keep their weekly intake of Brassica greens consistent and discuss dietary changes with their prescribing physician, as fluctuating intake can destabilize INR levels.

### Does potherb mustard affect thyroid function?

Brassica juncea contains glucosinolates, including sinigrin, which are converted by the enzyme myrosinase (activated during chopping or chewing) into allyl isothiocyanate and goitrogenic byproducts such as goitrin and thiocyanates. These compounds can competitively inhibit thyroid peroxidase and reduce iodide uptake by the thyroid gland, which is a concern mainly at high chronic intake in individuals with pre-existing hypothyroidism or low dietary iodine. Cooking deactivates myrosinase, significantly reducing goitrogenic potential.

### How much vitamin C does potherb mustard contain compared to other greens?

Brassica juncea (mustard greens) is one of the higher-vitamin C Brassica vegetables, with raw leaves providing approximately 70–130 mg of ascorbic acid per 100 g fresh weight, depending on variety and post-harvest handling, which exceeds the vitamin C content of spinach (roughly 28 mg/100 g) and is comparable to kale. Vitamin C in this context supports collagen synthesis via prolyl hydroxylase, enhances non-heme iron absorption in the gut, and contributes to the plant's overall antioxidant capacity alongside sinapic acid derivatives.

### Is there a standardized supplement dose for potherb mustard extract?

No standardized clinical dosage for potherb mustard extract has been established because no human clinical trials have evaluated it as a dietary supplement. In ethnobotanical traditions, the whole leaf is consumed as a food vegetable or prepared as a decoction for diuretic or expectorant purposes, but specific quantities are not validated by controlled research. Anyone considering a concentrated extract should consult a healthcare provider, as the safety profile, effective dose range, and potential toxicity thresholds at supplemental levels are currently unknown.

### What are glucosinolates in potherb mustard and why are they important?

Glucosinolates are sulfur-containing compounds found in Brassica juncea that break down into bioactive compounds called isothiocyanates when the plant tissue is damaged or digested. These compounds have been studied for potential antioxidant and anti-inflammatory properties, though human clinical evidence remains limited. The glucosinolate content in potherb mustard varies depending on growing conditions, harvest time, and processing methods.

### Is potherb mustard safe to consume during pregnancy and breastfeeding?

While potherb mustard is a food-grade vegetable consumed in traditional cuisines, high-dose supplements or extracts have not been adequately studied in pregnant or breastfeeding women. Due to its glucosinolate content and vitamin K levels, which may affect hormone metabolism and blood clotting factors, pregnant women should consult a healthcare provider before taking concentrated potherb mustard supplements. Consuming potherb mustard as a whole food in normal dietary amounts is generally considered safe during pregnancy and breastfeeding.

### How do the antioxidant phenolics in potherb mustard compare to other cruciferous vegetables?

Potherb mustard contains significant levels of phenolic compounds including sinapine (2.62-36.5 mg/g dry weight) and sinapic acid, with total phenolic content varying based on variety and growing conditions. While comparable cruciferous vegetables like broccoli and cabbage also contain phenolics, potherb mustard's sinapine concentration places it among the more potent sources within the Brassica genus. Direct side-by-side clinical studies comparing antioxidant bioavailability between these vegetables remain limited.

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