Triisostearin

Benefits
Softening

What is Triisostearin?

Triisostearin is a triglyceride ester produced by reacting glycerol with isostearic acid, a branched fatty acid often sourced from oleic-rich vegetable oils like high-oleic sunflower. In cosmetics, it appears in oil-based and emulsified products such as lip balms, foundations, creams, and hair conditioners. It works by lubricating skin surfaces to promote even spreading, thickening formulations for improved stability and user experience, and dissolving oil-soluble components to ensure uniform distribution. Its branched molecular structure provides better low-temperature performance, reduced odor, and enhanced oxidative stability over linear alternatives, contributing to longer shelf life without compromising sensory feel. Typically incorporated at low levels, it delivers a lightweight, non-sticky finish ideal for daily use across various product formats.

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

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.
Solvent
Dissolves and carries other ingredients, helping control viscosity, evaporation rate, and delivery of actives in both water- and oil-based systems.

Benefits

Provides softening effect by smoothing skin's surface and reducing roughness.

Enhances product spreadability and texture for comfortable application.

Supports moisture retention through emollient properties that limit water 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 dry or rough skin seeking gentle hydration.
Those with rare allergies to fatty acid esters.
Individuals preferring lightweight, non-greasy formulations.
People experiencing irritation from similar emollients.
Users of makeup or lip products for improved wear and feel.
Individuals sensitive to branched-chain lipids.

Safety Notes

  • Considered low hazard with minimal risk of irritation or comedogenicity.
  • Suitable for broad use in cosmetics when formulated properly.

Frequently Asked Questions about Triisostearin

What does triisostearin do in skincare?

It acts as an emollient to soften skin, controls viscosity for better texture, and serves as a solvent for other ingredients.

Is triisostearin safe for sensitive skin?

Yes, it carries a low hazard rating and shows minimal irritation potential in formulations.

Does triisostearin cause acne?

No, its comedogenic rating is 0, making it unlikely to clog pores.