Emollient

Isopropyl Isostearate

Reviewed by Kate · Last updated 18 Aug 2026

Ester of isopropyl alcohol and isostearic acid

At a glance

May feed Fungal Acne

Things to be aware of

May cause Acne Can worsen Oily Skin

What Is Isopropyl Isostearate?

Isopropyl isostearate is the ester of isopropyl alcohol and isostearic acid. It is used as a skin-softening agent and emollient in cosmetics products, retaining none of the sensitizing potential pure isopropyl alcohol has.

Clinical Evidence & References

Published Research

How widely it's used

0.4%
of skincare products contain this ingredient — placing it in the top 25% of most-used ingredients.
Most common in: Moisturisers Cleansers

Regulatory information

Standardised cosmetic-ingredient identifiers used by regulators.

Show identifiers
INCI Name
ISOPROPYL ISOSTEARATE
EC Number
250-651-1 / 269-023-3
Function
Binding, Emollient, Skin Conditioning

From the Clinic

Not sure what your skin actually needs?

Two minutes, a few questions, and we’ll point you at what matters — no guesswork.

Take the skin quiz

Learn More About Skincare Ingredients

Explore our comprehensive ingredient glossary to understand what's in your products.

Browse All Ingredients
Added to basket View basket Checkout

Authorised Stockist

Official UK retailer

Tracked Delivery

Free UK shipping over £50

5 Star Rating

Trusted by thousands

Expert Advice

Free consultations