Butylphenyl Methylpropional

Butylphenyl Methylpropional (Lilial) is a fragrance ingredient used at low concentrations, but fragrances are among the most common triggers of irritant and allergic contact dermatitis, especially in eczema-prone skin. Patch-test data and real-world dermatology experience show meaningful sensitization risk despite “small amounts,” and it can amplify cumulative irritation when layered with other fragranced products. Given the high patient-safety stakes in compromised skin, it warrants a significant irritancy score. Safety Notes: Butylphenyl Methylpropional (Lilial) is prohibited for use in cosmetic products in the EU/UK and has been broadly removed from mainstream OTC skincare globally; current consumer products are therefore effectively formulated at 0%. While historically it appeared as a fragrance component at trace-to-low levels in both leave-on and rinse-off products, it is no longer considered an acceptable market-available cosmetic ingredient in compliant consumer skincare, so the observed present-day range is 0%.