What it is
Sorbeth-30 tetraoleate is made by attaching about thirty units of ethylene oxide to sorbitol and then esterifying with oleic acid, producing a nonionic surfactant with both water-loving and oil-loving regions. This structure lets it emulsify oils into water-based systems and improve the spread and feel of a formula. It is used as a processing and texture aid rather than a skin active.
Safety & warnings
Nonionic ethoxylated sorbitan and sorbitol esters are generally mild and well tolerated. As an ethoxylated material it should be made from suitably purified feedstocks. It is used at typical emulsifier levels and is not a recognized fragrance allergen.
Origin & sourcing
A synthetic ingredient derived from sorbitol (a sugar alcohol), ethylene oxide, and oleic acid (a fatty acid that can be plant- or animal-sourced).
Questions everyone asks
What does it do in a formula?
It works as a nonionic emulsifier and surfactant, helping blend oil and water phases and improve spreadability.
Is it the same as polysorbates?
It is related chemistry, an ethoxylated sorbitol fatty-acid ester, but it is a distinct ingredient with its own ethoxylation level and oleic acid esterification.