Science
Mechanism of Action
Functions by penetrating the hair shaft where it undergoes oxidative coupling with hydrogen peroxide to create large, trapped pigment molecules within the hair cortex, though its mechanism on skin tissue involves potential cellular DNA damage through mutagenic pathways
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Two-year rodent studies at 512-8000 ppm demonstrated increased forestomach carcinomas and urinary bladder tumors
- 02 Human patch testing showed no primary irritation in control subjects despite sensitization potential
Transparency
Dusting Analysis
Not applicable for skincare formulations due to regulatory restrictions and safety profile
The Formula
Formulation
Stability
Light brown crystalline solid requiring protection from prolonged air and light exposure; maintains stability under standard conditions but degrades with environmental exposure
Conflicts
- Strong oxidizing agents
- Strong acids
- Strong bases
- Iron
- Moisture
Safety
Safety Profile
Banned in European Union under Annex II regulations and listed under California Proposition 65 as a carcinogen; CIR approval limited exclusively to oxidative hair dye applications with insufficient data for other cosmetic uses
Your Skin
Skin Compatibility
Our Assessment
Verdict
This ingredient should be avoided in precision skincare due to its carcinogenic classification, regulatory restrictions, and lack of demonstrated skin benefits.
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References
Sources