Isopentyldiol at a glance

  • Synthetic ingredient that is used as solvent to form cosmetic solutions
  • Can also add hydration to skin thanks to its humectant properties
  • Provides emollience minus a tacky feel
  • Described as an odourless, colourless, water-soluble liquid

Isopentyldiol description

Isopentyldiol is a synthetic ingredient that is used as solvent to form cosmetic solutions. It can also add hydration to skin thanks to its humectant properties. Suppliers of this ingredient note it provides emollience minus a tacky feel. Isopentyldiol is found in all kinds of beauty products, including facial masks, serums, makeup remover wipes, foundations, and hair care. As a raw material, it is described as an odourless, colourless, water-soluble liquid. In their 2018 assessment, the Cosmetic Ingredient Review Expert Panel surveyed 160 personal care products containing up to 15% isopentyldiol and gave their seal of approval for this ingredient’s safety.  

Isopentyldiol references

  • UL Prospector, Accessed January 2022, ePublication
  • Cosmetic Ingredient Review, March 2018, pages 1-73

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.