Cholesteryl Isostearate

What is Cholesteryl Isostearate?

Cholesteryl Isostearate is a synthetic ester formed from cholesterol, a lipid similar to those in skin, and isostearic acid, a branched fatty acid derived from natural oils like olive or coconut. Commonly used in lipsticks, foundations, creams, and anhydrous formulas, it acts as an emollient and skin conditioner. In products, it melts at skin temperature to deliver a silky, non-sticky finish, improves spreadability, and stabilizes emulsions by adjusting thickness. Its cholesterol-like structure helps mimic the skin's lipid barrier, providing a protective film that supports hydration retention without greasiness. This ingredient excels in color cosmetics for long wear and in moisturizers for refined sensory feel.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.
Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.

Benefits

Delivers soft, smooth skin feel by filling surface irregularities.

Enhances formula stability and ease of use through viscosity control.

Provides lightweight emolliency to minimize moisture loss.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
People with normal to dry skin needing added softness.
Those with known allergies to cholesterol derivatives.
Users of lip and color cosmetics for better wear.
People avoiding esters from fatty acids.
Individuals seeking non-greasy, spreadable moisturizers.
Individuals sensitive to lipid-based emollients, though rare.

Safety Notes

  • Rated low hazard with minimal irritation risk in cosmetics.
  • Non-comedogenic, suitable for acne-prone skin routines.

Frequently Asked Questions about Cholesteryl Isostearate

What does Cholesteryl Isostearate do in skincare?

It softens skin, improves product texture, and controls thickness for better stability and application.

Is it safe for daily use?

Yes, it shows low hazard potential and is widely used in cosmetics without reported issues.

Does it cause irritation?

Evidence indicates low irritation risk for most skin types.