Butylphenyl Methylpropional


Fragrance Synthetic and Natural

No known benefits

Butylphenyl Methylpropional at a glance

  • Fragrance ingredient with a floral scent
  • Proven to irritate skin
  • May be a health risk if multiple products containing it are used
  • Rarely used in skin care or makeup products

Butylphenyl Methylpropional description

Butylphenyl methylpropional is a synthetic fragrance ingredient with a strong floral scent. It also goes by the name 2-(4-tert-butylbenzyl) propionaldehyde or lilial. Butylphenyl methylpropional’s use in cosmetics is restricted due to concerns over sensitivity, especially if multiple products (both personal care and household items such as air freshener) are used routinely. This ingredient is banned for use in cosmetic and personal care products sold in European Union member countries due to potential reproductive harms in people. Worth noting is that this ingredient rarely shows up in skin care or makeup products, being more common as a fragrance additive in hair care products, perfumes and household cleansers. In countries where butylphenyl methylpropional is still permitted for use, it must be indicated on the ingredient list if the product contains more than 0.001% and is meant to be left on skin; it also must be listed if the product contains more than 0.01% and is meant to be rinsed. This would not apply to its usage in household cleaners and laundry products.

Butylphenyl Methylpropional references

  • Cosmetics, March 2022, ePublication
  • Contact Dermatitis, January 2021, pages 21–41; and May 2011, pages 265–272
  • Environmental Health Perspectives, August 2016, pages 1,155–1,165

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not rated

We have not yet rated this ingredient because we have not had a chance to review the research on it.