HYDRATROPIC ALDEHYDE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
An alpha-methyl substituted phenylacetaldehyde (Hydratropic aldehyde) used as a fragrance ingredient with potential sensitisation concerns.
Hydratropic aldehyde (2-methyl-3-phenylpropanal) is an alpha-methyl phenylacetaldehyde providing sweet, floral, and hyacinth-like fragrance notes. The alpha-methyl substitution reduces the aldehyde's reactivity compared to non-substituted phenylacetaldehyde, potentially lowering sensitisation risk. However, alpha-methyl aldehydes can undergo aldol condensation and oxidation during storage, which may affect both odor and safety. It is subject to EU allergen declaration requirements under Regulation (EC) No 1223/2009 as a fragrance allergen.
Skin benefits
- Provides sweet, floral, hyacinth-like fragrance notes
Known concerns
- EU allergen declaration likely required
- Aldol condensation during storage may affect safety profile
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
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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.