Black mustard Toxic?

Updated 2026-03-06| 2 min read| 1,371 found this helpful
Brassica nigra (L.) W.D.J.Koch
1

All parts of the plant are toxic, especially mature seeds, containing SMCO and glucosinolates

2

Glucosinolates are not inactivated by drying, while SMCO is inactivated via drying or ensiling

3

Poisoning typically impacts the gastrointestinal, respiratory, nervous, or urinary systems

FAQ

Is Black mustard toxic to Humans?

No specific human toxicity data reported; large ingestion may cause oral irritation, salivation, abdominal pain, and bloody diarrhea (Low)

Is Black mustard toxic to Cats?

No feline-specific toxicity data documented; monitor for gastrointestinal distress, salivation, or respiratory difficulty if ingested (Low)

Is Black mustard toxic to Dogs?

No canine-specific toxicity data documented; monitor for vomiting, diarrhea, abdominal pain, or disorientation if ingested (Low)

Is Black mustard toxic to Horses?

No equine-specific toxicity data documented; high ingestion may cause gastrointestinal irritation, colic, or urinary tract issues (Low)

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Toxicity Details

Humans
Low

No specific human toxicity data reported; large ingestion may cause oral irritation, salivation, abdominal pain, and bloody diarrhea

Cats
Low

No feline-specific toxicity data documented; monitor for gastrointestinal distress, salivation, or respiratory difficulty if ingested

Dogs
Low

No canine-specific toxicity data documented; monitor for vomiting, diarrhea, abdominal pain, or disorientation if ingested

Horses
Low

No equine-specific toxicity data documented; high ingestion may cause gastrointestinal irritation, colic, or urinary tract issues

Toxicity Snapshot

Toxic PartsWhole plant, particularly mature seeds
Exposure RouteIngestion of raw plant material, contaminated feed, or unprocessed press residues of the plant
Toxic CompoundsSMCO (S-Methyl-Cysteine-Sulfoxide); Glucosinolates (mustard oil glycosides)

First Aid & Prevention

First 30 Minutes

  • • Remove all remaining plant material from the mouth and surrounding area to stop further ingestion
  • • Induce vomiting only if explicitly advised by a medical or veterinary professional, for alert individuals that ingested the plant within 10 minutes
  • • Avoid administering food, water, or home remedies unless directed by a healthcare provider

Contact Vet Immediately

  • • Any symptoms of poisoning (salivation, diarrhea, difficulty breathing, disorientation, bloody urine) appear after exposure
  • • Large quantities of the plant or its seeds are ingested by any animal or human
  • • An individual with pre-existing gastrointestinal or respiratory conditions ingests the plant

Prevention

  • • Do not feed black mustard or its press residues to livestock, as this practice is prohibited
  • • Only feed green rapeseed to livestock prior to the flowering stage, and avoid feeding rapeseed cake alongside other Brassicaceae plants
  • • Inspect livestock feed regularly to remove contamination with black mustard plant material or seeds

Treatment & Prognosis

  • • Perform appropriate decontamination procedures based on the exposure route and time since ingestion
  • • Administer targeted symptomatic and supportive care for the presenting symptoms (e.g. gastrointestinal support, respiratory support, fluid therapy)
  • • Follow standard emergency toxicity treatment protocols as guided by a qualified medical or veterinary professional
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Professional Toxicology

Scientific NameBrassica nigra (L.) W.D.J.Koch
AliasesSchwarzer Senf、Moutarde noire、Chou noir、Sénévé noir、Senape nera、Cavolo senape nera
Toxicity Grade
HumansLow
CatsLow
DogsLow
HorsesLow
Target Organs
Gastrointestinal tractRespiratory tractCentral nervous systemUrinary tractOral mucous membranesLungs
Mechanism of Action

• SMCO (the anemia factor) is inactivated by drying or ensiling, but can cause anemia if consumed in its active form

• Glucosinolates are converted to toxic derivatives (isothiocyanates, nitriles, thiocyanates) when the plant is damaged or processed by rumen flora, and are not inactivated by drying

• Toxic metabolites irritate epithelial tissues and disrupt normal function across multiple body systems

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Ruminants (cattle, sheep, goats): Poisoning may occur if fed raw green plant material, presenting with gastrointestinal distress, respiratory difficulty, disorientation, or hemoglobinuria; cases are rare as feeding black mustard to livestock is prohibited
Confusion Risk

The following plants look similar and may be confused:

Other Brassica species Brassica spp.
All Brassica species contain glucosinolates and usually SMCO, making them chemically and visually similar; differentiate via seed color and leaf morphology
White mustard Sinapis alba
Contains glucosinolates like black mustard, distinguished by pale yellow seeds and lower overall toxicity
Field mustard Sinapis arvensis
Closely related, contains glucosinolates, differentiated by smaller flowers and preference for disturbed agricultural habitats
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Related Toxic Plants

Rapeseed
Brassica napus
Low to High toxicity
Cabbage
Cabbage
Brassica oleracea var. capitata
Low toxicity (only with excessive one-sided feeding)
Wild radish
Wild radish
Raphanus raphanistrum
Low to Moderate toxicity

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Data Sources

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.

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