Hydrogenated Castor Oil Isostearate

What is Hydrogenated Castor Oil Isostearate?

Hydrogenated Castor Oil Isostearate is a waxy ester created by reacting hydrogenated castor oil, derived from the seeds of the Ricinus communis plant, with isostearic acid, a branched-chain fatty acid from vegetable oils. This process yields a stable, non-polar ingredient commonly used in color cosmetics like lipsticks and mascaras, as well as creams and lotions. It functions by forming a protective film on the skin to lock in moisture, enhancing smoothness without greasiness. In formulations, it increases viscosity to prevent separation, improves pigment dispersion for even application, and adds a glossy finish. Its hydrophobic nature makes it ideal for water-resistant products, while its mild profile suits diverse skin types in rinse-off and leave-on applications.

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.

Benefits

Provides a softening effect to maintain skin smoothness and flexibility.

Enhances product stability by adjusting thickness for optimal texture and spreadability.

Supports non-comedogenic formulas, minimizing pore-clogging potential.

Who It's For

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

Who May Benefit	Who Should Avoid
Individuals with dry or rough skin seeking added softness.	Those with known allergies to castor oil derivatives.
Users of makeup products desiring improved wear and shine.	People experiencing reactions to fatty acid esters.
People preferring stable, easy-to-apply cosmetic textures.	Individuals sensitive to plant-based emollients.

Safety Notes

Rated low hazard by environmental health assessments.
Generally well-tolerated in cosmetic concentrations.

Frequently Asked Questions about Hydrogenated Castor Oil Isostearate

What is Hydrogenated Castor Oil Isostearate?

A waxy ester from hydrogenated castor oil and isostearic acid, used for conditioning and thickening in cosmetics.

Is it safe for daily use?

Yes, it shows low hazard potential and is suitable for most in cosmetic products.

Does it suit acne-prone skin?

Its zero comedogenic rating suggests it avoids pore blockage.