What it is
Laureth-1 Phosphate is formed by reacting lauryl alcohol that has been ethoxylated with one unit of ethylene oxide with phosphoric acid to create a phosphate ester. In formulas it functions as an anionic emulsifier and surfactant, helping oil and water phases combine into a stable emulsion. It is commonly used in lotions, creams, and sunscreens where it contributes to texture and stability.
Safety & warnings
Phosphate-ester emulsifiers of this type are generally well tolerated at use levels in finished products. Like other surfactants they can be mildly irritating in high concentration, but in formulated leave-on products they are buffered and used at low levels.
Origin & sourcing
Synthetic, manufactured by ethoxylation of lauryl (dodecyl) alcohol followed by phosphation; the lauryl alcohol portion can be sourced from plant oils or petrochemicals.
Questions everyone asks
What is the role of Laureth-1 Phosphate in a sunscreen?
It acts as an emulsifier and surfactant, helping the oil and water portions of the formula blend into a smooth, stable cream or lotion.
Is it a UV filter?
No. It is a formulation aid and does not absorb or block UV light; the sun protection comes from separate UV filter ingredients.