What it is
Behenoyl stearic acid is a long-chain fatty acid derivative built from behenic (C22) and stearic (C18) acid units. Its high lipid content makes it useful for imparting emollient skin feel and for modifying the viscosity and structure of anhydrous and emulsion bases. It is used in sunscreens and color cosmetics to help build body and a smooth texture.
Safety & warnings
Long-chain fatty acid emollients of this type are generally well tolerated and low in irritancy. Heavier fatty materials can be richer on the skin, which acne-prone users may wish to keep in mind, though tolerance varies by formula and individual.
Origin & sourcing
Derived from fatty acids that may be sourced from plant oils or processed lipids.
Questions everyone asks
What does this ingredient do in a sun cream?
It works as an emollient and texture builder, contributing smoothness and helping structure the base.
Is it a wax or an oil?
It is a long-chain fatty acid derivative that behaves as a lipid texture agent, lending body to a formula rather than acting as a free oil.