What it is
Oleyl alcohol is a long-chain monounsaturated fatty alcohol derived from oleic acid. Because of its double bond it is liquid at room temperature, which makes it a smooth, lightweight emollient compared with saturated fatty alcohols. In formulas it conditions the skin, helps stabilize emulsions, and influences viscosity and spreadability.
Safety & warnings
Oleyl alcohol is generally well tolerated as an emollient fatty alcohol and is not a recognized fragrance allergen. As an oleic-acid-derived material it is fairly rich, so people with very oily or congestion-prone skin may find heavy use less comfortable.
Origin & sourcing
Natural or synthetic depending on the source. It is commonly produced from oleic acid obtained from plant oils, and can also be manufactured synthetically.
Questions everyone asks
How is oleyl alcohol different from other fatty alcohols?
It is unsaturated and liquid at room temperature, giving it a lighter, more emollient feel than waxy saturated fatty alcohols like cetyl or stearyl alcohol.
What does it do in a sunscreen?
It works as an emollient and emulsion stabilizer, helping condition skin and keep the formula smooth and stable. It is not a UV filter.