What it is
Isocetyl stearate is the ester of branched isocetyl alcohol and stearic acid. It functions as an emollient, leaving skin feeling smooth and conditioned while giving formulas a light, non-greasy slip. Branched esters like this one are valued for their pleasant spreadability and are common in sun care, lotions, and color cosmetics.
Safety & warnings
Isocetyl stearate is generally well tolerated. As a heavier branched fatty ester, it may have some comedogenic potential for users prone to clogged pores, so the acne-prone may wish to take note.
Origin & sourcing
It is a synthetic ester typically produced from isocetyl alcohol and stearic acid, the latter of which may be sourced from plant or animal fats.
Questions everyone asks
What does isocetyl stearate do in a formula?
It is an emollient that conditions skin and gives the product a smooth, lightweight slip without a heavy greasy feel.
Can it clog pores?
As a heavier fatty ester it may have some comedogenic potential, so those prone to clogged pores may wish to take note.