What it is
Ceteth-10 is an ethoxylated fatty alcohol in which cetyl alcohol is combined with about ten units of ethylene oxide, giving it both oil-loving and water-loving regions. This structure lets it disperse oils into water and help stabilize emulsions, so it is used to keep sunscreen creams and lotions uniform. It can also help solubilize fragrances and other oil-soluble components into aqueous systems.
Safety & warnings
Considered low-irritation and non-sensitizing at the levels used in cosmetics. As with other ethoxylated ingredients, manufacturing controls limit residual ethylene oxide and 1,4-dioxane. It is not a recognized fragrance allergen.
Origin & sourcing
Synthetic; manufactured by ethoxylating cetyl alcohol, which itself can be sourced from plant oils or petrochemicals.
Questions everyone asks
What does the '10' in Ceteth-10 mean?
It indicates the approximate average number of ethylene oxide units attached to cetyl alcohol, which influences how water-loving the ingredient is.
Why is Ceteth-10 in my sunscreen?
It works as an emulsifier and solubilizer, helping blend oil and water phases so the product stays smooth and stable.