What it is
Laureth-7 is a polyethylene glycol ether of lauryl (dodecyl) alcohol, where the number 7 indicates an average of seven ethylene oxide units. This gives it a balance of oil-loving and water-loving character, making it a mild nonionic surfactant and emulsifier. In formulas it helps create stable emulsions and improve the dispersion of oils, so the product spreads evenly and stays uniform.
Safety & warnings
Laureth-type nonionic surfactants are generally well tolerated in cosmetics. As an ethoxylated ingredient it may, in poorly purified grades, contain trace 1,4-dioxane, which reputable manufacturers control during production. It is not a notable fragrance allergen.
Origin & sourcing
Synthetic. It is produced by reacting lauryl alcohol with ethylene oxide; the lauryl alcohol can be sourced from plant oils such as coconut or palm, or from petrochemicals.
Questions everyone asks
What does laureth-7 do in a sunscreen?
It acts as an emulsifier and surfactant, helping the oil and water parts of the formula stay blended so the product has a smooth, stable texture.
What does the 7 in laureth-7 mean?
It indicates the average number of ethylene oxide units attached to the lauryl alcohol, which influences how well the ingredient balances oil and water.