Isostearyl Isostearate



Isostearyl Isostearate at a glance

  • Liquid emollient ester that helps prevent moisture loss
  • Improves the texture of makeup products such as lipstick
  • Made from a blend of a fatty acid and a fatty alcohol
  • Sometimes used to replace mineral oil

Isostearyl Isostearate description

Isostearyl isostearate is a vegetable-derived or synthetic liquid emollient ester that helps prevent moisture loss, softens skin, improves an impaired barrier, and can enhance the texture of products such as lipstick. This emollient is also used as a binding agent to keep the dry ingredients in powder-based products together. Isostearyl isostearate is stable and, unlike natural oils, not prone to rancidity. It has a more cosmetically elegant texture than mineral oil, so is sometimes used to replace this ingredient. Usage levels of isostearyl isostearate in skin care are typically between 2–10% depending on formulary needs and other emollients present. It is considered safe and non-irritating as used in cosmetics.

Isostearyl Isostearate references

  • International Journal of Toxicology, September-October 2015, pages 5S–69S
  • International Journal of Cosmetic Science, December 2012, pages 502–512
  • International Journal of Cosmetic Science, August 2010, pages 304–312

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