Science
Mechanism of Action
This ingredient functions solely as a colorant, imparting pigment to the hair or skin surface. Its mechanism is non-active, focused purely on aesthetic coloration within cosmetic formulations.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
As a synthesized chemical compound, HC Yellow No. 5 is not typically associated with 'dusting' concerns that may arise with finely milled natural ingredients or powders.
The Formula
Formulation
Stability
HC Yellow No. 5 demonstrates stability within a pH range of 5.5 to 8.5 and disperses effectively in water, ethanol, and propylene glycol. To maintain optimal stability and integrity, it should be stored in its tightly-sealed original packaging, away from direct light and moisture.
Safety
Safety Profile
The CIR Expert Panel considers HC Yellow No. 5 safe when used as a hair dye ingredient, with reported concentrations up to 1.6%. However, for non-hair dye cosmetic applications like skincare, it is an unapproved color additive in the United States, requiring specific FDA approval. The European Union has prohibited its use in cosmetics (Annex II) due to insufficient safety data. Clinical testing has indicated mild dermal irritation at a 1% concentration. There is a documented risk of skin sensitization and allergic-type reactions (including rashes, itching, and breathing difficulties) in susceptible individuals, particularly those with aspirin hypersensitivity, a concern also noted for related FD&C Yellow No. 5.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Given its purely aesthetic function as a colorant without proven skincare benefits, combined with significant regulatory limitations and a demonstrated potential for dermal irritation and sensitization, HC Yellow No. 5 is unsuitable for precision skincare formulations.
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References
Sources