Isononyl Isononanoate



No known benefits

Isononyl Isononanoate at a glance

  • Synthetic ester that functions as an emollient skin-softening agent
  • Derived from the esters of nonanoic acid, which occurs naturally
  • Typically used in concentrations between 2–10%
  • Ruled safe as used in cosmetics

Isononyl Isononanoate description

Isononyl isononanoate is a synthetic ester that functions as an emollient skin-softening agent. It is derived from the esters of nonanoic acid, a 9-carbon fatty acid which occurs naturally in cocoa oil and lavender oil (along with many other plant oils). It is typically used in cosmetics in concentrations between 2% - 10%. The Cosmetic Ingredient Review Expert Panel has determined that isononyl isononanoate is safe in its current use and concentration in cosmetic products. It found that in concentrations of less than 12%, nonanoic acid is not a skin irritant.

Isononyl Isononanoate references

  • Journal of Olio Science, December 2020, pages 1627-1639
  • International Journal of Toxicology, December 2011, pages 228S-269-S

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