What it is
Trihydroxystearin is a glycerol ester of 12-hydroxystearic acid, related to components of hydrogenated castor oil. It is used to thicken and gel oil and wax phases, improve suspension of pigments, and add body to creams, balms, and sticks. In sunscreens it helps structure the formula and keep particulate ingredients evenly dispersed.
Safety & warnings
Trihydroxystearin is generally considered well tolerated and non-irritating at cosmetic use levels and is not a recognized fragrance allergen. As a castor-derived lipid it is most relevant in thicker or sticklike products; individuals prone to congestion may prefer to monitor heavier formulations.
Origin & sourcing
Typically derived from castor oil chemistry; the hydroxystearic acid component is related to hydrogenated castor oil and is esterified with glycerin.
Questions everyone asks
What is Trihydroxystearin used for?
It thickens and gels oil phases, helps suspend pigments and powders, and adds structure to creams, balms, and sticks.
Where does it come from?
It is a glycerin ester of hydroxystearic acid, chemistry related to hydrogenated castor oil.