Science
Mechanism of Action
This synthetic azo dye primarily imparts color to formulations. It also functions as a pH indicator, changing from red at pH 1.2 to yellow at pH 2.3, though its biochemical enzyme induction effects are not therapeutically relevant topically.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
It functions as a pH indicator, transitioning from red at pH 1.2 to yellow at pH 2.3. Stable under ordinary conditions, it is sensitive to strong oxidizing agents, strong acids, and strong bases.
Conflicts
- strong oxidizing agents
- strong acids
- strong bases
Safety
Safety Profile
The FDA restricts its use to external drugs and cosmetics (excluding the eye area) as Ext. D&C Yellow No. 1. It is a known contact allergen with a risk of sensitization, typically found in rinse-off products in the EU.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Primarily a colorant with significant regulatory restrictions and a known risk of contact sensitization, making it generally unsuitable for precision leave-on skincare formulations.
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References
Sources