Trihydroxystearin

Benefits
Softening

What is Trihydroxystearin?

Trihydroxystearin is a waxy lipid derived from hydrogenated castor oil, specifically the triglyceride ester of glycerol and 12-hydroxystearic acid. This plant-sourced ingredient appears as a white to pale yellow paste with a high melting point, making it ideal for anhydrous cosmetic formulations like lipsticks, balms, deodorants, and hair waxes. In products, it functions by self-assembling into a three-dimensional network within oils, increasing viscosity and providing structural stability without water. This gel-like matrix improves creaminess, prevents separation, and allows smooth application as it melts upon skin contact. Its emollient properties stem from mimicking skin's natural lipids, while its solvent-like action aids in blending oils and actives for even distribution.

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

Softens skin by filling surface imperfections for a smoother feel.

Enhances product thickness and spreadability for better usability.

Supports moisture retention when combined with other emollients.

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 softening effects.
Individuals with rare allergies to castor oil derivatives.
Users of oil-based products like balms needing stable texture.
People sensitive to thick, waxy textures in cosmetics.
Those preferring non-greasy, matte-finish formulations.
Those using only water-based, lightweight products.

Safety Notes

  • Consistently low hazard rating from safety assessments.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Trihydroxystearin

What is trihydroxystearin made from?

It's a triglyceride from hydrogenated castor oil, esterified with hydroxystearic acid.

Is trihydroxystearin safe for sensitive skin?

Yes, it shows low irritation potential in cosmetic use.

What products commonly contain it?

Found in lipsticks, balms, deodorants, and oil-based creams for texture.