Skin Conditioning
BRASSICA NIGRA SEED POWDER
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
Black mustard seed powder — produces allyl isothiocyanate on contact with moisture, a known skin irritant. Use with caution.
Brassica nigra (black mustard) seed powder contains sinigrin, which hydrolyses on contact with water and endogenous myrosinase to produce allyl isothiocyanate (AITC). AITC is a pungent, rubefacient compound that can cause significant skin irritation, blistering and burns on prolonged contact — it is the mechanism behind the classic mustard plaster. There is no CIR review of this cosmetic ingredient, and it is not commonly used in modern formulations. Sensitive skin and broken skin are at particular risk. Safe cosmetic use requires very low percentages in short-contact rinse-off products.
Skin benefits
- Traditional warming/rubefacient ingredient
- Natural antimicrobial potential from glucosinolates
Known concerns
- Contains sinigrin which hydrolyses to allyl isothiocyanate — a potent skin irritant/vesicant
- Risk of burns on sensitive skin
- Not suitable for leave-on use at significant levels
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related skin conditionings
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.